The great module madness continus, now with pointers.

graph2/graph.go

@@ -47,10 +47,6 @@ func (r *rootResolver) Story() StoryResolver {
 	return &types.StoryResolver
 }
 
-func (r *rootResolver) File() FileResolver {
-	return &types.FileResolver
-}
-
 func (r *rootResolver) Change() ChangeResolver {
 	return &types.ChangeResolver
 }

graph2/queries/changes.go

@@ -16,7 +16,7 @@ func (r *resolver) Changes(ctx context.Context, filter *changes.Filter) ([]model
 
 /// Subscriptions
 
-func (r *subscriptionResolver) Changes(ctx context.Context, keys []models.ChangeKey) (<-chan models.Change, error) {
+func (r *subscriptionResolver) Changes(ctx context.Context, keys []models.ChangeKey) (<-chan *models.Change, error) {
 	if len(keys) == 0 {
 		return nil, errors.New("At least one key is required for a subscription")
 	}

graph2/queries/channel.go

@@ -14,8 +14,13 @@ import (
 
 // Queries
 
-func (r *resolver) Channel(ctx context.Context, name string) (models.Channel, error) {
-	return channels.FindName(name)
+func (r *resolver) Channel(ctx context.Context, name string) (*models.Channel, error) {
+	channel, err := channels.FindName(name)
+	if err != nil {
+		return nil, err
+	}
+
+	return &channel, nil
 }
 
 func (r *resolver) Channels(ctx context.Context, filter *channels.Filter) ([]models.Channel, error) {
@@ -24,10 +29,10 @@ func (r *resolver) Channels(ctx context.Context, filter *channels.Filter) ([]mod
 
 // Mutations
 
-func (r *mutationResolver) AddChannel(ctx context.Context, input input.ChannelAddInput) (models.Channel, error) {
+func (r *mutationResolver) AddChannel(ctx context.Context, input input.ChannelAddInput) (*models.Channel, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("channel.add") {
-		return models.Channel{}, errors.New("You are not permitted to add channels")
+		return nil, errors.New("You are not permitted to add channels")
 	}
 
 	logged := false
@@ -49,31 +54,31 @@ func (r *mutationResolver) AddChannel(ctx context.Context, input input.ChannelAd
 
 	channel, err := channels.Add(input.Name, logged, hub, eventName, locationName)
 	if err != nil {
-		return models.Channel{}, errors.New("Failed to add channel: " + err.Error())
+		return nil, errors.New("Failed to add channel: " + err.Error())
 	}
 
 	go changes.Submit("Channel", "add", token.UserID, true, changekeys.Listed(channel), channel)
 
-	return channel, nil
+	return &channel, nil
 }
 
-func (r *mutationResolver) EditChannel(ctx context.Context, input input.ChannelEditInput) (models.Channel, error) {
+func (r *mutationResolver) EditChannel(ctx context.Context, input input.ChannelEditInput) (*models.Channel, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("channel.edit") {
-		return models.Channel{}, errors.New("You are not permitted to edit channels")
+		return nil, errors.New("You are not permitted to edit channels")
 	}
 
 	channel, err := channels.FindName(input.Name)
 	if err != nil {
-		return models.Channel{}, errors.New("Channel not found")
+		return nil, errors.New("Channel not found")
 	}
 
 	channel, err = channels.Edit(channel, input.Logged, input.Hub, input.EventName, input.LocationName)
 	if err != nil {
-		return models.Channel{}, errors.New("Failed to edit channel: " + err.Error())
+		return nil, errors.New("Failed to edit channel: " + err.Error())
 	}
 
 	go changes.Submit("Channel", "edit", token.UserID, true, changekeys.Listed(channel), channel)
 
-	return channel, nil
+	return &channel, nil
 }

graph2/queries/chapter.go

@@ -5,48 +5,51 @@ import (
 	"errors"
 	"time"
 
+	"git.aiterp.net/rpdata/api/graph2/input"
+	"git.aiterp.net/rpdata/api/internal/auth"
+	"git.aiterp.net/rpdata/api/models"
 	"git.aiterp.net/rpdata/api/models/changekeys"
 	"git.aiterp.net/rpdata/api/models/changes"
+	"git.aiterp.net/rpdata/api/models/chapters"
 	"git.aiterp.net/rpdata/api/models/comments"
-
-	"git.aiterp.net/rpdata/api/internal/auth"
 	"git.aiterp.net/rpdata/api/models/stories"
-
-	"git.aiterp.net/rpdata/api/graph2/input"
-	"git.aiterp.net/rpdata/api/models"
-	"git.aiterp.net/rpdata/api/models/chapters"
 )
 
 // Queries
 
-func (r *resolver) Chapter(ctx context.Context, id string) (models.Chapter, error) {
-	return chapters.FindID(id)
+func (r *resolver) Chapter(ctx context.Context, id string) (*models.Chapter, error) {
+	chapter, err := chapters.FindID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &chapter, nil
 }
 
 // Mutations
 
-func (r *mutationResolver) AddChapter(ctx context.Context, input input.ChapterAddInput) (models.Chapter, error) {
+func (r *mutationResolver) AddChapter(ctx context.Context, input input.ChapterAddInput) (*models.Chapter, error) {
 	story, err := stories.FindID(input.StoryID)
 	if err != nil {
-		return models.Chapter{}, errors.New("Story not found")
+		return nil, errors.New("Story not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.Permitted("member", "story.add") {
-		return models.Chapter{}, errors.New("Unauthorized")
+		return nil, errors.New("Unauthorized")
 	}
 
 	author := token.UserID
 	if input.Author != nil && *input.Author != author {
 		if !token.Permitted("story.add") {
-			return models.Chapter{}, errors.New("False pretender")
+			return nil, errors.New("False pretender")
 		}
 
 		author = *input.Author
 	}
 
 	if !story.Open && story.Author != author {
-		return models.Chapter{}, errors.New("Story is not open")
+		return nil, errors.New("Story is not open")
 	}
 
 	commentMode := models.ChapterCommentModeDisabled
@@ -56,38 +59,38 @@ func (r *mutationResolver) AddChapter(ctx context.Context, input input.ChapterAd
 
 	chapter, err := chapters.Add(story, input.Title, author, input.Source, time.Now(), input.FictionalDate, commentMode)
 	if err != nil {
-		return models.Chapter{}, errors.New("Failed to create chapter: " + err.Error())
+		return nil, errors.New("Failed to create chapter: " + err.Error())
 	}
 
 	go changes.Submit("Chapter", "add", token.UserID, story.Listed, changekeys.Listed(story, chapter), story, chapter)
 
-	return chapter, nil
+	return &chapter, nil
 }
 
-func (r *mutationResolver) MoveChapter(ctx context.Context, input input.ChapterMoveInput) (models.Chapter, error) {
+func (r *mutationResolver) MoveChapter(ctx context.Context, input input.ChapterMoveInput) (*models.Chapter, error) {
 	chapter, err := chapters.FindID(input.ID)
 	if err != nil {
-		return models.Chapter{}, errors.New("Chapter not found")
+		return nil, errors.New("Chapter not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.PermittedUser(chapter.Author, "member", "chapter.move") {
-		return models.Chapter{}, errors.New("You are not allowed to move this chapter")
+		return nil, errors.New("You are not allowed to move this chapter")
 	}
 
 	target, err := stories.FindID(input.StoryID)
 	if err != nil {
-		return models.Chapter{}, errors.New("Target story not found")
+		return nil, errors.New("Target story not found")
 	}
 
 	if !target.Open && !token.PermittedUser(target.Author, "member", "chapter.move") {
-		return models.Chapter{}, errors.New("You are not permitted to move chapters to this story")
+		return nil, errors.New("You are not permitted to move chapters to this story")
 	}
 
 	oldStoryID := chapter.StoryID
 	chapter, err = chapters.Move(chapter, target)
 	if err != nil {
-		return models.Chapter{}, errors.New("Failed to move chapter: " + err.Error())
+		return nil, errors.New("Failed to move chapter: " + err.Error())
 	}
 
 	go func() {
@@ -105,18 +108,18 @@ func (r *mutationResolver) MoveChapter(ctx context.Context, input input.ChapterM
 		changes.Submit("Chapter", "move-in", token.UserID, story.Listed, changekeys.Listed(story, chapter), story, chapter)
 	}()
 
-	return chapter, nil
+	return &chapter, nil
 }
 
-func (r *mutationResolver) EditChapter(ctx context.Context, input input.ChapterEditInput) (models.Chapter, error) {
+func (r *mutationResolver) EditChapter(ctx context.Context, input input.ChapterEditInput) (*models.Chapter, error) {
 	chapter, err := chapters.FindID(input.ID)
 	if err != nil {
-		return models.Chapter{}, errors.New("Chapter not found")
+		return nil, errors.New("Chapter not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.PermittedUser(chapter.Author, "member", "chapter.edit") {
-		return models.Chapter{}, errors.New("Unauthorized")
+		return nil, errors.New("Unauthorized")
 	}
 
 	if input.ClearFictionalDate != nil && *input.ClearFictionalDate == true {
@@ -125,7 +128,7 @@ func (r *mutationResolver) EditChapter(ctx context.Context, input input.ChapterE
 
 	chapter, err = chapters.Edit(chapter, input.Title, input.Source, input.FictionalDate, input.CommentMode, input.CommentsLocked)
 	if err != nil {
-		return models.Chapter{}, errors.New("Failed to edit chapter: " + err.Error())
+		return nil, errors.New("Failed to edit chapter: " + err.Error())
 	}
 
 	go func() {
@@ -137,28 +140,28 @@ func (r *mutationResolver) EditChapter(ctx context.Context, input input.ChapterE
 		changes.Submit("Chapter", "edit", token.UserID, story.Listed, changekeys.Many(story, chapter), chapter)
 	}()
 
-	return chapter, nil
+	return &chapter, nil
 }
 
-func (r *mutationResolver) RemoveChapter(ctx context.Context, input input.ChapterRemoveInput) (models.Chapter, error) {
+func (r *mutationResolver) RemoveChapter(ctx context.Context, input input.ChapterRemoveInput) (*models.Chapter, error) {
 	chapter, err := chapters.FindID(input.ID)
 	if err != nil {
-		return models.Chapter{}, errors.New("Chapter not found")
+		return nil, errors.New("Chapter not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.PermittedUser(chapter.Author, "member", "chapter.remove") {
-		return models.Chapter{}, errors.New("Unauthorized")
+		return nil, errors.New("Unauthorized")
 	}
 
 	chapter, err = chapters.Remove(chapter)
 	if err != nil {
-		return models.Chapter{}, errors.New("Failed to remove chapter: " + err.Error())
+		return nil, errors.New("Failed to remove chapter: " + err.Error())
 	}
 
 	err = comments.RemoveChapter(chapter)
 	if err != nil {
-		return models.Chapter{}, errors.New("Chapter was removed, but comment removal failed: " + err.Error())
+		return nil, errors.New("Chapter was removed, but comment removal failed: " + err.Error())
 	}
 
 	go func() {
@@ -170,5 +173,5 @@ func (r *mutationResolver) RemoveChapter(ctx context.Context, input input.Chapte
 		changes.Submit("Chapter", "remove", token.UserID, story.Listed, changekeys.Many(story, chapter), chapter)
 	}()
 
-	return chapter, nil
+	return &chapter, nil
 }

graph2/queries/character.go

@@ -16,13 +16,23 @@ import (
 
 // Queries
 
-func (r *resolver) Character(ctx context.Context, id *string, nick *string) (models.Character, error) {
+func (r *resolver) Character(ctx context.Context, id *string, nick *string) (*models.Character, error) {
 	if id != nil {
-		return characters.FindID(*id)
+		character, err := characters.FindID(*id)
+		if err != nil {
+			return nil, err
+		}
+
+		return &character, nil
 	} else if nick != nil {
-		return characters.FindNick(*nick)
+		character, err := characters.FindNick(*nick)
+		if err != nil {
+			return nil, err
+		}
+
+		return &character, nil
 	} else {
-		return models.Character{}, errors.New("You must specify either an ID or a nick")
+		return nil, errors.New("You must specify either an ID or a nick")
 	}
 }
 
@@ -32,13 +42,13 @@ func (r *resolver) Characters(ctx context.Context, filter *characters.Filter) ([
 
 // Mutations
 
-func (r *mutationResolver) AddCharacter(ctx context.Context, input input.CharacterAddInput) (models.Character, error) {
+func (r *mutationResolver) AddCharacter(ctx context.Context, input input.CharacterAddInput) (*models.Character, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Permitted("member", "character.add") {
-		return models.Character{}, errors.New("You are not permitted to add characters")
+		return nil, errors.New("You are not permitted to add characters")
 	}
 	if len(input.Name) < 2 || len(input.Nick) < 2 {
-		return models.Character{}, errors.New("You need to provide a name and a nick (min length: 2)")
+		return nil, errors.New("You need to provide a name and a nick (min length: 2)")
 	}
 
 	shortName := ""
@@ -56,7 +66,7 @@ func (r *mutationResolver) AddCharacter(ctx context.Context, input input.Charact
 	author := token.UserID
 	if input.Author != nil && *input.Author != author {
 		if !token.Permitted("character.add") {
-			return models.Character{}, errors.New("You are only permitted to add your own characters")
+			return nil, errors.New("You are only permitted to add your own characters")
 		}
 
 		author = *input.Author
@@ -66,109 +76,109 @@ func (r *mutationResolver) AddCharacter(ctx context.Context, input input.Charact
 
 	character, err := characters.Add(input.Nick, input.Name, shortName, author, description)
 	if err != nil {
-		return models.Character{}, errors.New("Adding character failed: " + err.Error())
+		return nil, errors.New("Adding character failed: " + err.Error())
 	}
 
 	go changes.Submit("Character", "add", token.UserID, true, changekeys.Listed(character), character)
 
-	return character, nil
+	return &character, nil
 }
 
-func (r *mutationResolver) AddCharacterNick(ctx context.Context, input input.CharacterNickInput) (models.Character, error) {
+func (r *mutationResolver) AddCharacterNick(ctx context.Context, input input.CharacterNickInput) (*models.Character, error) {
 	character, err := characters.FindID(input.ID)
 	if err != nil {
-		return models.Character{}, errors.New("Character not found")
+		return nil, errors.New("Character not found")
 	}
 
 	if len(input.Nick) < 2 {
-		return models.Character{}, errors.New("You need to provide a valid nick (min length: 2)")
+		return nil, errors.New("You need to provide a valid nick (min length: 2)")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.PermittedUser(character.Author, "member", "character.edit") {
-		return models.Character{}, errors.New("You are not permitted to edit this character")
+		return nil, errors.New("You are not permitted to edit this character")
 	}
 
 	logs.ScheduleFullUpdate()
 
 	character, err = characters.AddNick(character, input.Nick)
 	if err != nil {
-		return models.Character{}, errors.New("Failed to add nick: " + err.Error())
+		return nil, errors.New("Failed to add nick: " + err.Error())
 	}
 
 	go logs.ScheduleFullUpdate()
 	go changes.Submit("Character", "edit", token.UserID, true, changekeys.Listed(character), character)
 
-	return character, nil
+	return &character, nil
 }
 
-func (r *mutationResolver) RemoveCharacterNick(ctx context.Context, input input.CharacterNickInput) (models.Character, error) {
+func (r *mutationResolver) RemoveCharacterNick(ctx context.Context, input input.CharacterNickInput) (*models.Character, error) {
 	character, err := characters.FindID(input.ID)
 	if err != nil {
-		return models.Character{}, errors.New("Character not found")
+		return nil, errors.New("Character not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.PermittedUser(character.Author, "member", "character.edit") {
-		return models.Character{}, errors.New("You are not permitted to edit this character")
+		return nil, errors.New("You are not permitted to edit this character")
 	}
 
 	character, err = characters.RemoveNick(character, input.Nick)
 	if err != nil {
-		return models.Character{}, errors.New("Failed to remove nick: " + err.Error())
+		return nil, errors.New("Failed to remove nick: " + err.Error())
 	}
 
 	go logs.ScheduleFullUpdate()
 	go changes.Submit("Character", "edit", token.UserID, true, changekeys.Listed(character), character)
 
-	return character, nil
+	return &character, nil
 }
 
-func (r *mutationResolver) EditCharacter(ctx context.Context, input input.CharacterEditInput) (models.Character, error) {
+func (r *mutationResolver) EditCharacter(ctx context.Context, input input.CharacterEditInput) (*models.Character, error) {
 	character, err := characters.FindID(input.ID)
 	if err != nil {
-		return models.Character{}, errors.New("Character not found")
+		return nil, errors.New("Character not found")
 	}
 
 	if input.Name != nil && len(*input.Name) < 2 {
-		return models.Character{}, errors.New("You need to provide a valid name (min length: 2)")
+		return nil, errors.New("You need to provide a valid name (min length: 2)")
 	}
 	if input.ShortName != nil && len(*input.ShortName) < 2 {
-		return models.Character{}, errors.New("You need to provide a valid short name (min length: 2)")
+		return nil, errors.New("You need to provide a valid short name (min length: 2)")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.PermittedUser(character.Author, "member", "character.edit") {
-		return models.Character{}, errors.New("You are not permitted to edit this character")
+		return nil, errors.New("You are not permitted to edit this character")
 	}
 
 	character, err = characters.Edit(character, input.Name, input.ShortName, input.Description)
 	if err != nil {
-		return models.Character{}, errors.New("Failed to edit character: " + err.Error())
+		return nil, errors.New("Failed to edit character: " + err.Error())
 	}
 
 	go changes.Submit("Character", "edit", token.UserID, true, changekeys.Listed(character), character)
 
-	return character, nil
+	return &character, nil
 }
 
-func (r *mutationResolver) RemoveCharacter(ctx context.Context, input input.CharacterRemoveInput) (models.Character, error) {
+func (r *mutationResolver) RemoveCharacter(ctx context.Context, input input.CharacterRemoveInput) (*models.Character, error) {
 	character, err := characters.FindID(input.ID)
 	if err != nil {
-		return models.Character{}, errors.New("Character not found")
+		return nil, errors.New("Character not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.PermittedUser(character.Author, "member", "character.remove") {
-		return models.Character{}, errors.New("You are not permitted to remove this character")
+		return nil, errors.New("You are not permitted to remove this character")
 	}
 
 	character, err = characters.Remove(character)
 	if err != nil {
-		return models.Character{}, errors.New("Failed to remove character: " + err.Error())
+		return nil, errors.New("Failed to remove character: " + err.Error())
 	}
 
 	go changes.Submit("Character", "remove", token.UserID, true, changekeys.Listed(character), character)
 
-	return character, nil
+	return &character, nil
 }

graph2/queries/comment.go

@@ -24,34 +24,39 @@ import (
 
 // Queries
 
-func (r *resolver) Comment(ctx context.Context, id string) (models.Comment, error) {
-	return comments.Find(id)
+func (r *resolver) Comment(ctx context.Context, id string) (*models.Comment, error) {
+	comment, err := comments.Find(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &comment, nil
 }
 
 // Mutations
 
-func (r *mutationResolver) AddComment(ctx context.Context, input input.CommentAddInput) (models.Comment, error) {
+func (r *mutationResolver) AddComment(ctx context.Context, input input.CommentAddInput) (*models.Comment, error) {
 	chapter, err := chapters.FindID(input.ChapterID)
 	if err != nil {
-		return models.Comment{}, errors.New("Chapter not found")
+		return nil, errors.New("Chapter not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.Permitted("member", "story.edit") {
-		return models.Comment{}, errors.New("Unauthorized")
+		return nil, errors.New("Unauthorized")
 	}
 
 	if !chapter.CanComment() {
-		return models.Comment{}, errors.New("Comments are disabled or locked")
+		return nil, errors.New("Comments are disabled or locked")
 	}
 
 	var characterPtr *models.Character
 	if input.CharacterID != nil {
 		character, err := characters.FindID(*input.CharacterID)
 		if err != nil {
-			return models.Comment{}, errors.New("Character not found")
+			return nil, errors.New("Character not found")
 		} else if character.Author != token.UserID {
-			return models.Comment{}, errors.New("That is not your character")
+			return nil, errors.New("That is not your character")
 		}
 
 		characterPtr = &character
@@ -69,7 +74,7 @@ func (r *mutationResolver) AddComment(ctx context.Context, input input.CommentAd
 
 	comment, err := comments.Add(chapter, subject, token.UserID, input.Source, input.CharacterName, characterPtr, time.Now(), fictionalDate)
 	if err != nil {
-		return models.Comment{}, errors.New("Failed to add comment: " + err.Error())
+		return nil, errors.New("Failed to add comment: " + err.Error())
 	}
 
 	go func() {
@@ -82,27 +87,27 @@ func (r *mutationResolver) AddComment(ctx context.Context, input input.CommentAd
 		changes.Submit("Comment", "add", token.UserID, true, changekeys.Many(comment, chapter, models.Story{ID: chapter.StoryID}), comment, chapter, story)
 	}()
 
-	return comment, nil
+	return &comment, nil
 }
 
-func (r *mutationResolver) EditComment(ctx context.Context, input input.CommentEditInput) (models.Comment, error) {
+func (r *mutationResolver) EditComment(ctx context.Context, input input.CommentEditInput) (*models.Comment, error) {
 	comment, err := comments.Find(input.CommentID)
 	if err != nil {
-		return models.Comment{}, errors.New("Comment not found")
+		return nil, errors.New("Comment not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.PermittedUser(comment.Author, "member", "story.edit") {
-		return models.Comment{}, errors.New("You cannot edit this comment")
+		return nil, errors.New("You cannot edit this comment")
 	}
 
 	chapter, err := chapters.FindID(comment.ChapterID)
 	if err != nil {
-		return models.Comment{}, errors.New("Comment's chapter not found")
+		return nil, errors.New("Comment's chapter not found")
 	}
 
 	if !chapter.CanComment() {
-		return models.Comment{}, errors.New("Comments are disabled or locked")
+		return nil, errors.New("Comments are disabled or locked")
 	}
 
 	if input.ClearFictionalDate != nil && *input.ClearFictionalDate == true {
@@ -112,15 +117,15 @@ func (r *mutationResolver) EditComment(ctx context.Context, input input.CommentE
 	if input.CharacterID != nil && *input.CharacterID != "" {
 		character, err := characters.FindID(*input.CharacterID)
 		if err != nil {
-			return models.Comment{}, errors.New("Character not found")
+			return nil, errors.New("Character not found")
 		} else if character.Author != token.UserID {
-			return models.Comment{}, errors.New("That is not your character")
+			return nil, errors.New("That is not your character")
 		}
 	}
 
 	comment, err = comments.Edit(comment, input.Source, input.CharacterName, input.CharacterID, input.Subject, input.FictionalDate)
 	if err != nil {
-		return models.Comment{}, errors.New("Could not post comment: " + err.Error())
+		return nil, errors.New("Could not post comment: " + err.Error())
 	}
 
 	go func() {
@@ -133,32 +138,32 @@ func (r *mutationResolver) EditComment(ctx context.Context, input input.CommentE
 		changes.Submit("Comment", "edit", token.UserID, true, changekeys.Many(comment, chapter, models.Story{ID: chapter.StoryID}), comment, chapter, story)
 	}()
 
-	return comment, nil
+	return &comment, nil
 }
 
-func (r *mutationResolver) RemoveComment(ctx context.Context, input input.CommentRemoveInput) (models.Comment, error) {
+func (r *mutationResolver) RemoveComment(ctx context.Context, input input.CommentRemoveInput) (*models.Comment, error) {
 	comment, err := comments.Find(input.CommentID)
 	if err != nil {
-		return models.Comment{}, errors.New("Comment not found")
+		return nil, errors.New("Comment not found")
 	}
 
 	token := auth.TokenFromContext(ctx)
 	if !token.PermittedUser(comment.Author, "member", "story.edit") {
-		return models.Comment{}, errors.New("You cannot remove this comment")
+		return nil, errors.New("You cannot remove this comment")
 	}
 
 	chapter, err := chapters.FindID(comment.ChapterID)
 	if err != nil {
-		return models.Comment{}, errors.New("Comment's chapter not found")
+		return nil, errors.New("Comment's chapter not found")
 	}
 
 	if !chapter.CanComment() {
-		return models.Comment{}, errors.New("Comments are disabled or locked")
+		return nil, errors.New("Comments are disabled or locked")
 	}
 
 	err = comments.Remove(comment)
 	if err != nil {
-		return models.Comment{}, errors.New("Failed to remove comment: " + err.Error())
+		return nil, errors.New("Failed to remove comment: " + err.Error())
 	}
 
 	go func() {
@@ -171,5 +176,5 @@ func (r *mutationResolver) RemoveComment(ctx context.Context, input input.Commen
 		changes.Submit("Comment", "remove", token.UserID, true, changekeys.Many(comment, chapter, models.Story{ID: chapter.StoryID}), comment, chapter, story)
 	}()
 
-	return comment, nil
+	return &comment, nil
 }

graph2/queries/file.go

@@ -8,8 +8,13 @@ import (
 	"git.aiterp.net/rpdata/api/models/files"
 )
 
-func (r *resolver) File(ctx context.Context, id string) (models.File, error) {
-	return files.FindID(id)
+func (r *resolver) File(ctx context.Context, id string) (*models.File, error) {
+	file, err := files.FindID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &file, nil
 }
 
 func (r *resolver) Files(ctx context.Context, filter *files.Filter) ([]models.File, error) {

graph2/queries/log.go

@@ -20,8 +20,13 @@ import (
 
 // Queries
 
-func (r *resolver) Log(ctx context.Context, id string) (models.Log, error) {
-	return logs.FindID(id)
+func (r *resolver) Log(ctx context.Context, id string) (*models.Log, error) {
+	log, err := logs.FindID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &log, nil
 }
 
 func (r *resolver) Logs(ctx context.Context, filter *logs.Filter) ([]models.Log, error) {
@@ -56,10 +61,10 @@ func (r *resolver) Logs(ctx context.Context, filter *logs.Filter) ([]models.Log,
 
 // Mutations
 
-func (r *mutationResolver) AddLog(ctx context.Context, input input.LogAddInput) (models.Log, error) {
+func (r *mutationResolver) AddLog(ctx context.Context, input input.LogAddInput) (*models.Log, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("log.add") {
-		return models.Log{}, errors.New("You are not permitted to add logs")
+		return nil, errors.New("You are not permitted to add logs")
 	}
 
 	open := input.Open != nil && *input.Open == true
@@ -80,7 +85,7 @@ func (r *mutationResolver) AddLog(ctx context.Context, input input.LogAddInput)
 
 	log, err := logs.Add(input.Date, input.Channel, title, event, description, open)
 	if !token.Authenticated() || !token.Permitted("log.add") {
-		return models.Log{}, errors.New("Failed to create log: " + err.Error())
+		return nil, errors.New("Failed to create log: " + err.Error())
 	}
 
 	go func() {
@@ -94,7 +99,7 @@ func (r *mutationResolver) AddLog(ctx context.Context, input input.LogAddInput)
 		changes.Submit("Log", "add", token.UserID, true, changekeys.Listed(log), log)
 	}()
 
-	return log, nil
+	return &log, nil
 }
 
 func (r *mutationResolver) ImportLog(ctx context.Context, input input.LogImportInput) ([]models.Log, error) {
@@ -141,44 +146,44 @@ func (r *mutationResolver) ImportLog(ctx context.Context, input input.LogImportI
 	return newLogs, nil
 }
 
-func (r *mutationResolver) EditLog(ctx context.Context, input input.LogEditInput) (models.Log, error) {
+func (r *mutationResolver) EditLog(ctx context.Context, input input.LogEditInput) (*models.Log, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("log.edit") {
-		return models.Log{}, errors.New("You are not permitted to edit logs")
+		return nil, errors.New("You are not permitted to edit logs")
 	}
 
 	log, err := logs.FindID(input.ID)
 	if err != nil {
-		return models.Log{}, errors.New("Log not found")
+		return nil, errors.New("Log not found")
 	}
 
 	log, err = logs.Edit(log, input.Title, input.Event, input.Description, input.Open)
 	if err != nil {
-		return models.Log{}, errors.New("Failed to edit log: " + err.Error())
+		return nil, errors.New("Failed to edit log: " + err.Error())
 	}
 
 	go changes.Submit("Log", "edit", token.UserID, true, changekeys.Listed(log), log)
 
-	return log, nil
+	return &log, nil
 }
 
-func (r *mutationResolver) RemoveLog(ctx context.Context, input input.LogRemoveInput) (models.Log, error) {
+func (r *mutationResolver) RemoveLog(ctx context.Context, input input.LogRemoveInput) (*models.Log, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("log.remove") {
-		return models.Log{}, errors.New("You are not permitted to remove logs")
+		return nil, errors.New("You are not permitted to remove logs")
 	}
 
 	log, err := logs.FindID(input.ID)
 	if err != nil {
-		return models.Log{}, errors.New("Log not found")
+		return nil, errors.New("Log not found")
 	}
 
 	log, err = logs.Remove(log)
 	if err != nil {
-		return models.Log{}, errors.New("Failed to remove log: " + err.Error())
+		return nil, errors.New("Failed to remove log: " + err.Error())
 	}
 
 	go changes.Submit("Log", "remove", token.UserID, true, changekeys.Listed(log), log)
 
-	return log, nil
+	return &log, nil
 }

graph2/queries/post.go

@@ -16,8 +16,13 @@ import (
 
 // Queries
 
-func (r *resolver) Post(ctx context.Context, id string) (models.Post, error) {
-	return posts.FindID(id)
+func (r *resolver) Post(ctx context.Context, id string) (*models.Post, error) {
+	post, err := posts.FindID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &post, nil
 }
 
 func (r *resolver) Posts(ctx context.Context, filter *posts.Filter) ([]models.Post, error) {
@@ -43,37 +48,37 @@ func (r *resolver) Posts(ctx context.Context, filter *posts.Filter) ([]models.Po
 
 // Mutation
 
-func (r *mutationResolver) AddPost(ctx context.Context, input input.PostAddInput) (models.Post, error) {
+func (r *mutationResolver) AddPost(ctx context.Context, input input.PostAddInput) (*models.Post, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("post.add") {
-		return models.Post{}, errors.New("You are not permitted to edit logs")
+		return nil, errors.New("You are not permitted to edit logs")
 	}
 
 	log, err := logs.FindID(input.LogID)
 	if err != nil {
-		return models.Post{}, err
+		return nil, err
 	}
 
 	post, err := posts.Add(log, input.Time, input.Kind, input.Nick, input.Text)
 	if err != nil {
-		return models.Post{}, err
+		return nil, err
 	}
 
 	go logs.UpdateCharacters(log, nil)
 	go changes.Submit("Post", "add", token.UserID, true, changekeys.Many(log, post), post)
 
-	return post, nil
+	return &post, nil
 }
 
-func (r *mutationResolver) EditPost(ctx context.Context, input input.PostEditInput) (models.Post, error) {
+func (r *mutationResolver) EditPost(ctx context.Context, input input.PostEditInput) (*models.Post, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("post.edit") {
-		return models.Post{}, errors.New("You are not permitted to edit logs")
+		return nil, errors.New("You are not permitted to edit logs")
 	}
 
 	post, err := posts.FindID(input.ID)
 	if err != nil {
-		return models.Post{}, errors.New("Post not found")
+		return nil, errors.New("Post not found")
 	}
 
 	if input.Nick != nil {
@@ -89,7 +94,7 @@ func (r *mutationResolver) EditPost(ctx context.Context, input input.PostEditInp
 
 	post, err = posts.Edit(post, input.Time, input.Kind, input.Nick, input.Text)
 	if err != nil {
-		return models.Post{}, errors.New("Adding post failed: " + err.Error())
+		return nil, errors.New("Adding post failed: " + err.Error())
 	}
 
 	go func() {
@@ -101,7 +106,7 @@ func (r *mutationResolver) EditPost(ctx context.Context, input input.PostEditInp
 		changes.Submit("Post", "edit", token.UserID, true, changekeys.Many(log, post), post)
 	}()
 
-	return post, nil
+	return &post, nil
 }
 
 func (r *mutationResolver) MovePost(ctx context.Context, input input.PostMoveInput) ([]models.Post, error) {
@@ -132,20 +137,20 @@ func (r *mutationResolver) MovePost(ctx context.Context, input input.PostMoveInp
 	return posts, nil
 }
 
-func (r *mutationResolver) RemovePost(ctx context.Context, input input.PostRemoveInput) (models.Post, error) {
+func (r *mutationResolver) RemovePost(ctx context.Context, input input.PostRemoveInput) (*models.Post, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() || !token.Permitted("post.remove") {
-		return models.Post{}, errors.New("You are not permitted to edit logs")
+		return nil, errors.New("You are not permitted to edit logs")
 	}
 
 	post, err := posts.FindID(input.ID)
 	if err != nil {
-		return models.Post{}, errors.New("Post not found (before removing, of course)")
+		return nil, errors.New("Post not found (before removing, of course)")
 	}
 
 	post, err = posts.Remove(post)
 	if err != nil {
-		return models.Post{}, errors.New("Could not remove post: " + err.Error())
+		return nil, errors.New("Could not remove post: " + err.Error())
 	}
 
 	go func() {
@@ -158,5 +163,5 @@ func (r *mutationResolver) RemovePost(ctx context.Context, input input.PostRemov
 		changes.Submit("Post", "remove", token.UserID, true, changekeys.Many(log, post), post)
 	}()
 
-	return post, nil
+	return &post, nil
 }

graph2/queries/story.go

@@ -15,8 +15,13 @@ import (
 	"git.aiterp.net/rpdata/api/models/stories"
 )
 
-func (r *resolver) Story(ctx context.Context, id string) (models.Story, error) {
-	return stories.FindID(id)
+func (r *resolver) Story(ctx context.Context, id string) (*models.Story, error) {
+	story, err := stories.FindID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &story, nil
 }
 
 func (r *resolver) Stories(ctx context.Context, filter *stories.Filter) ([]models.Story, error) {
@@ -38,16 +43,16 @@ func (r *resolver) Stories(ctx context.Context, filter *stories.Filter) ([]model
 
 // Mutations
 
-func (r *mutationResolver) AddStory(ctx context.Context, input input.StoryAddInput) (models.Story, error) {
+func (r *mutationResolver) AddStory(ctx context.Context, input input.StoryAddInput) (*models.Story, error) {
 	token := auth.TokenFromContext(ctx)
 	if token == nil || !token.Permitted("member", "story.add") {
-		return models.Story{}, errors.New("Permission denied")
+		return nil, errors.New("Permission denied")
 	}
 
 	author := token.UserID
 	if input.Author != nil && *input.Author != author {
 		if !token.Permitted("story.add") {
-			return models.Story{}, errors.New("You are not permitted to add a story in another author's name")
+			return nil, errors.New("You are not permitted to add a story in another author's name")
 		}
 
 		author = *input.Author
@@ -63,80 +68,80 @@ func (r *mutationResolver) AddStory(ctx context.Context, input input.StoryAddInp
 
 	story, err := stories.Add(input.Name, author, input.Category, listed, open, input.Tags, time.Now(), fictionalDate)
 	if err != nil {
-		return models.Story{}, errors.New("Failed to add story: " + err.Error())
+		return nil, errors.New("Failed to add story: " + err.Error())
 	}
 
 	go changes.Submit("Story", "add", token.UserID, story.Listed, changekeys.Listed(story), story)
 
-	return story, nil
+	return &story, nil
 }
 
-func (r *mutationResolver) AddStoryTag(ctx context.Context, input input.StoryTagAddInput) (models.Story, error) {
+func (r *mutationResolver) AddStoryTag(ctx context.Context, input input.StoryTagAddInput) (*models.Story, error) {
 	token := auth.TokenFromContext(ctx)
 
 	story, err := stories.FindID(input.ID)
 	if err != nil {
-		return models.Story{}, errors.New("Story not found")
+		return nil, errors.New("Story not found")
 	}
 
 	if story.Open {
 		if !token.Permitted("member") {
-			return models.Story{}, errors.New("You are not permitted to edit this story")
+			return nil, errors.New("You are not permitted to edit this story")
 		}
 	} else {
 		if !token.PermittedUser(story.Author, "member", "story.edit") {
-			return models.Story{}, errors.New("You are not permitted to edit this story")
+			return nil, errors.New("You are not permitted to edit this story")
 		}
 	}
 
 	story, err = stories.AddTag(story, input.Tag)
 	if err != nil {
-		return models.Story{}, errors.New("Failed to add story: " + err.Error())
+		return nil, errors.New("Failed to add story: " + err.Error())
 	}
 
 	go changes.Submit("Story", "tag", token.UserID, story.Listed, changekeys.Listed(story), story, input.Tag)
 
-	return story, nil
+	return &story, nil
 }
 
-func (r *mutationResolver) RemoveStoryTag(ctx context.Context, input input.StoryTagRemoveInput) (models.Story, error) {
+func (r *mutationResolver) RemoveStoryTag(ctx context.Context, input input.StoryTagRemoveInput) (*models.Story, error) {
 	token := auth.TokenFromContext(ctx)
 
 	story, err := stories.FindID(input.ID)
 	if err != nil {
-		return models.Story{}, errors.New("Story not found")
+		return nil, errors.New("Story not found")
 	}
 
 	if story.Open {
 		if !token.Permitted("member") {
-			return models.Story{}, errors.New("You are not permitted to edit this story")
+			return nil, errors.New("You are not permitted to edit this story")
 		}
 	} else {
 		if !token.PermittedUser(story.Author, "member", "story.edit") {
-			return models.Story{}, errors.New("You are not permitted to edit this story")
+			return nil, errors.New("You are not permitted to edit this story")
 		}
 	}
 
 	story, err = stories.RemoveTag(story, input.Tag)
 	if err != nil {
-		return models.Story{}, errors.New("Failed to add story: " + err.Error())
+		return nil, errors.New("Failed to add story: " + err.Error())
 	}
 
 	go changes.Submit("Story", "untag", token.UserID, story.Listed, changekeys.Listed(story), story, input.Tag)
 
-	return story, nil
+	return &story, nil
 }
 
-func (r *mutationResolver) EditStory(ctx context.Context, input input.StoryEditInput) (models.Story, error) {
+func (r *mutationResolver) EditStory(ctx context.Context, input input.StoryEditInput) (*models.Story, error) {
 	token := auth.TokenFromContext(ctx)
 
 	story, err := stories.FindID(input.ID)
 	if err != nil {
-		return models.Story{}, errors.New("Story not found")
+		return nil, errors.New("Story not found")
 	}
 
 	if !token.PermittedUser(story.Author, "member", "story.edit") {
-		return models.Story{}, errors.New("You are not permitted to remove this story")
+		return nil, errors.New("You are not permitted to remove this story")
 	}
 
 	if input.ClearFictionalDate != nil && *input.ClearFictionalDate {
@@ -145,37 +150,37 @@ func (r *mutationResolver) EditStory(ctx context.Context, input input.StoryEditI
 
 	story, err = stories.Edit(story, input.Name, input.Category, input.Listed, input.Open, input.FictionalDate)
 	if err != nil {
-		return models.Story{}, errors.New("Failed to add story: " + err.Error())
+		return nil, errors.New("Failed to add story: " + err.Error())
 	}
 
 	go changes.Submit("Story", "edit", token.UserID, story.Listed, changekeys.Listed(story), story)
 
-	return story, nil
+	return &story, nil
 }
 
-func (r *mutationResolver) RemoveStory(ctx context.Context, input input.StoryRemoveInput) (models.Story, error) {
+func (r *mutationResolver) RemoveStory(ctx context.Context, input input.StoryRemoveInput) (*models.Story, error) {
 	token := auth.TokenFromContext(ctx)
 
 	story, err := stories.FindID(input.ID)
 	if err != nil {
-		return models.Story{}, errors.New("Story not found")
+		return nil, errors.New("Story not found")
 	}
 
 	if !token.PermittedUser(story.Author, "member", "story.remove") {
-		return models.Story{}, errors.New("You are not permitted to remove this story")
+		return nil, errors.New("You are not permitted to remove this story")
 	}
 
 	story, err = stories.Remove(story)
 	if err != nil {
-		return models.Story{}, err
+		return nil, err
 	}
 
 	err = chapters.RemoveStory(story)
 	if err != nil {
-		return models.Story{}, errors.New("Failed to remove chapters, but story is removed: " + err.Error())
+		return nil, errors.New("Failed to remove chapters, but story is removed: " + err.Error())
 	}
 
 	go changes.Submit("Story", "remove", token.UserID, story.Listed, changekeys.Listed(story), story)
 
-	return story, nil
+	return &story, nil
 }

graph2/queries/token.go

@@ -8,11 +8,11 @@ import (
 	"git.aiterp.net/rpdata/api/models"
 )
 
-func (r *resolver) Token(ctx context.Context) (models.Token, error) {
+func (r *resolver) Token(ctx context.Context) (*models.Token, error) {
 	token := auth.TokenFromContext(ctx)
 	if !token.Authenticated() {
-		return models.Token{}, errors.New("No (valid) token")
+		return nil, errors.New("No (valid) token")
 	}
 
-	return *token, nil
+	return token, nil
 }

graph2/types/change.go

@@ -12,9 +12,11 @@ type changeResolver struct{}
 func (r *changeResolver) Objects(ctx context.Context, obj *models.Change) ([]input.ChangeObject, error) {
 	objects := obj.Objects()
 
-	results := make([]input.ChangeObject, len(objects))
-	for i := range objects {
-		results[i] = objects[i]
+	results := make([]input.ChangeObject, 0, len(objects))
+	for _, object := range objects {
+		if changeObject, ok := object.(input.ChangeObject); ok {
+			results = append(results, changeObject)
+		}
 	}
 
 	return results, nil

graph2/types/file.go

@@ -1,16 +0,0 @@
-package types
-
-import (
-	"context"
-
-	"git.aiterp.net/rpdata/api/models"
-)
-
-type fileResolver struct{}
-
-func (r *fileResolver) Size(ctx context.Context, file *models.File) (int, error) {
-	return int(file.Size), nil
-}
-
-// FileResolver is a resolver
-var FileResolver fileResolver

graph2/types/log.go

@@ -11,10 +11,10 @@ import (
 
 type logResolver struct{}
 
-func (r *logResolver) Channel(ctx context.Context, log *models.Log) (models.Channel, error) {
+func (r *logResolver) Channel(ctx context.Context, log *models.Log) (*models.Channel, error) {
 	loader := loader.FromContext(ctx)
 	if loader == nil {
-		return models.Channel{}, errors.New("no loader")
+		return nil, errors.New("no loader")
 	}
 
 	return loader.Channel("name", log.ChannelName)

graph2/types/token.go

@@ -9,8 +9,13 @@ import (
 
 type tokenResolver struct{}
 
-func (r *tokenResolver) User(ctx context.Context, token *models.Token) (models.User, error) {
-	return users.Find(token.UserID)
+func (r *tokenResolver) User(ctx context.Context, token *models.Token) (*models.User, error) {
+	user, err := users.Find(token.UserID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &user, nil
 }
 
 // TokenResolver is a resolver

internal/loader/channel.go

@@ -11,13 +11,13 @@ import (
 )
 
 // Channel gets a character by key
-func (loader *Loader) Channel(key, value string) (models.Channel, error) {
+func (loader *Loader) Channel(key, value string) (*models.Channel, error) {
 	if !strings.HasPrefix(key, "Channel.") {
 		key = "Channel." + key
 	}
 
 	if loader.loaders[key] == nil {
-		return models.Channel{}, errors.New("unsupported key")
+		return nil, errors.New("unsupported key")
 	}
 
 	loader.loadPrimed(key)
@@ -25,15 +25,15 @@ func (loader *Loader) Channel(key, value string) (models.Channel, error) {
 	thunk := loader.loaders[key].Load(loader.ctx, dataloader.StringKey(value))
 	res, err := thunk()
 	if err != nil {
-		return models.Channel{}, err
+		return nil, err
 	}
 
 	channel, ok := res.(models.Channel)
 	if !ok {
-		return channel, errors.New("incorrect type")
+		return nil, errors.New("incorrect type")
 	}
 
-	return channel, nil
+	return &channel, nil
 }
 
 // PrimeChannels primes channels for loading along with the first one.

models/changes/subscribe.go

@@ -12,13 +12,13 @@ var subList []*subscription
 
 type subscription struct {
 	Keys     map[string]bool
-	Channel  chan<- models.Change
+	Channel  chan<- *models.Change
 	WildCard bool
 }
 
 // Subscribe subscribes to all changes.
-func Subscribe(ctx context.Context, keys []models.ChangeKey, wildcard bool) <-chan models.Change {
-	channel := make(chan models.Change, 64)
+func Subscribe(ctx context.Context, keys []models.ChangeKey, wildcard bool) <-chan *models.Change {
+	channel := make(chan *models.Change, 64)
 	sub := &subscription{
 		Keys:     make(map[string]bool, len(keys)),
 		Channel:  channel,
@@ -58,16 +58,18 @@ func pushToSubscribers(change models.Change) {
 	subMutex.Lock()
 SubLoop:
 	for _, sub := range subList {
+		changeCopy := change
+
 		if sub.WildCard && change.Listed {
 			select {
-			case sub.Channel <- change:
+			case sub.Channel <- &changeCopy:
 			default:
 			}
 		} else {
 			for _, key := range keys {
 				if sub.Keys[key] {
 					select {
-					case sub.Channel <- change:
+					case sub.Channel <- &changeCopy:
 					default:
 					}
 

models/channel.go

@@ -8,3 +8,9 @@ type Channel struct {
 	EventName    string `bson:"eventName,omitempty"`
 	LocationName string `bson:"locationName,omitempty"`
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Channel) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/chapter.go

@@ -20,3 +20,9 @@ type Chapter struct {
 func (chapter *Chapter) CanComment() bool {
 	return !chapter.CommentsLocked && chapter.CommentMode.IsEnabled()
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Chapter) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/character.go

@@ -29,3 +29,9 @@ func (character *Character) HasNick(nick string) bool {
 
 	return false
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Character) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/comment.go

@@ -15,3 +15,9 @@ type Comment struct {
 	EditedDate    time.Time `bson:"editeddDate"`
 	Source        string    `bson:"source"`
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Comment) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/file.go

@@ -14,3 +14,9 @@ type File struct {
 	Author   string    `bson:"author" json:"author"`
 	URL      string    `bson:"url,omitempty" json:"url,omitempty"`
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*File) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/log.go

@@ -14,3 +14,9 @@ type Log struct {
 	Open         bool      `bson:"open"`
 	CharacterIDs []string  `bson:"characterIds"`
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Log) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/post.go

@@ -12,3 +12,9 @@ type Post struct {
 	Text     string    `bson:"text"`
 	Position int       `bson:"position"`
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Post) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/story.go

@@ -16,3 +16,9 @@ type Story struct {
 	FictionalDate time.Time     `bson:"fictionalDate,omitempty"`
 	UpdatedDate   time.Time     `bson:"updatedDate"`
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Story) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}

models/tag.go

@@ -10,3 +10,9 @@ type Tag struct {
 func (tag *Tag) Equal(other Tag) bool {
 	return tag.Kind == other.Kind && tag.Name == other.Name
 }
+
+// IsChangeObject is an interface implementation to identify it as a valid
+// ChangeObject in GQL.
+func (*Tag) IsChangeObject() {
+	panic("this method is a dummy, and so is its caller")
+}