Renamed index to position for Post model and API

model/log/log.go

@@ -203,7 +203,7 @@ func (log *Log) Posts(kinds ...string) ([]Post, error) {
 	}
 
 	sort.SliceStable(posts, func(i, j int) bool {
-		return posts[i].Index < posts[j].Index
+		return posts[i].Position < posts[j].Position
 	})
 
 	return posts, nil
@@ -218,14 +218,14 @@ func (log *Log) NewPost(time time.Time, kind, nick, text string) (Post, error) {
 	postMutex.RLock()
 	defer postMutex.RUnlock()
 
-	index, err := counter.Next("next_post_id", log.ShortID)
+	position, err := counter.Next("next_post_id", log.ShortID)
 	if err != nil {
 		return Post{}, err
 	}
 
 	post := Post{
 		ID:       MakePostID(time),
-		Index: index,
+		Position: position,
 		LogID:    log.ShortID,
 		Time:     time,
 		Kind:     kind,

model/log/post.go

@@ -23,7 +23,7 @@ type Post struct {
 	Kind     string    `bson:"kind"`
 	Nick     string    `bson:"nick"`
 	Text     string    `bson:"text"`
-	Index int       `bson:"index"`
+	Position int       `bson:"position"`
 }
 
 // Edit the post
@@ -67,40 +67,40 @@ func (post *Post) Edit(time *time.Time, kind *string, nick *string, text *string
 }
 
 // Move the post
-func (post *Post) Move(targetIndex int) error {
-	if targetIndex < 1 {
-		return errors.New("Invalid index")
+func (post *Post) Move(toPosition int) error {
+	if toPosition < 1 {
+		return errors.New("Invalid position")
 	}
 
 	postMutex.Lock()
 	defer postMutex.Unlock()
 
 	// To avoid problems, only allow target indices that are allowed. If it's 1, then there is bound to
-	// be a post at the index.
-	if targetIndex > 1 {
+	// be a post at the position.
+	if toPosition > 1 {
 		existingPost := Post{}
-		err := postCollection.Find(bson.M{"logId": post.LogID, "index": targetIndex}).One(&existingPost)
+		err := postCollection.Find(bson.M{"logId": post.LogID, "position": toPosition}).One(&existingPost)
 
-		if err != nil || existingPost.Index != targetIndex {
-			return errors.New("No post found at the index")
+		if err != nil || existingPost.Position != toPosition {
+			return errors.New("No post found at the position")
 		}
 	}
 
 	query := bson.M{"logId": post.LogID}
-	operation := bson.M{"$inc": bson.M{"index": 1}}
+	operation := bson.M{"$inc": bson.M{"position": 1}}
 
-	if targetIndex < post.Index {
+	if toPosition < post.Position {
 		query["$and"] = []bson.M{
-			bson.M{"index": bson.M{"$gte": targetIndex}},
-			bson.M{"index": bson.M{"$lt": post.Index}},
+			bson.M{"position": bson.M{"$gte": toPosition}},
+			bson.M{"position": bson.M{"$lt": post.Position}},
 		}
 	} else {
 		query["$and"] = []bson.M{
-			bson.M{"index": bson.M{"$gt": post.Index}},
-			bson.M{"index": bson.M{"$lte": targetIndex}},
+			bson.M{"position": bson.M{"$gt": post.Position}},
+			bson.M{"position": bson.M{"$lte": toPosition}},
 		}
 
-		operation["$inc"] = bson.M{"index": -1}
+		operation["$inc"] = bson.M{"position": -1}
 	}
 
 	_, err := postCollection.UpdateAll(query, operation)
@@ -108,12 +108,12 @@ func (post *Post) Move(targetIndex int) error {
 		return errors.New("moving others: " + err.Error())
 	}
 
-	err = postCollection.UpdateId(post.ID, bson.M{"$set": bson.M{"index": targetIndex}})
+	err = postCollection.UpdateId(post.ID, bson.M{"$set": bson.M{"position": toPosition}})
 	if err != nil {
 		return errors.New("moving: " + err.Error())
 	}
 
-	post.Index = targetIndex
+	post.Position = toPosition
 
 	return nil
 }
@@ -128,7 +128,7 @@ func ListPostIDs(ids ...string) ([]Post, error) {
 	return listPosts(bson.M{"_id": bson.M{"$in": ids}})
 }
 
-// RemovePost removes a post, moving all subsequent post up one index
+// RemovePost removes a post, moving all subsequent post up one position
 func RemovePost(id string) (Post, error) {
 	postMutex.Lock()
 	defer postMutex.Unlock()
@@ -143,7 +143,7 @@ func RemovePost(id string) (Post, error) {
 		return Post{}, err
 	}
 
-	_, err = postCollection.UpdateAll(bson.M{"logId": post.LogID, "index": bson.M{"$gt": post.Index}}, bson.M{"$inc": bson.M{"index": -1}})
+	_, err = postCollection.UpdateAll(bson.M{"logId": post.LogID, "position": bson.M{"$gt": post.Position}}, bson.M{"$inc": bson.M{"position": -1}})
 	if err != nil {
 		return Post{}, err
 	}
@@ -186,7 +186,7 @@ func init() {
 		postCollection.EnsureIndexKey("logId")
 		postCollection.EnsureIndexKey("time")
 		postCollection.EnsureIndexKey("kind")
-		postCollection.EnsureIndexKey("index")
+		postCollection.EnsureIndexKey("position")
 
 		err := postCollection.EnsureIndex(mgo.Index{
 			Key: []string{"$text:text"},

resolver/post.go

@@ -84,7 +84,7 @@ func (r *MutationResolver) AddPost(ctx context.Context, args struct{ Input *Post
 		"kind":     post.Kind,
 		"nick":     post.Nick,
 		"text":     post.Text,
-		"index": post.Index,
+		"position": post.Position,
 	})
 
 	go log.UpdateCharacters()
@@ -143,7 +143,7 @@ func (r *MutationResolver) EditPost(ctx context.Context, args struct{ Input *Pos
 // PostMoveInput is an input
 type PostMoveInput struct {
 	ID         string
-	TargetIndex int32
+	ToPosition int32
 }
 
 // MovePost resolves the movePost mutation
@@ -158,14 +158,14 @@ func (r *MutationResolver) MovePost(ctx context.Context, args struct{ Input *Pos
 		return nil, err
 	}
 
-	err = post.Move(int(args.Input.TargetIndex))
+	err = post.Move(int(args.Input.ToPosition))
 	if err != nil {
 		return nil, err
 	}
 
 	change.Submit("Post", "move", user.ID, post.ID, map[string]interface{}{
 		"logId":       post.LogID,
-		"targetIndex": args.Input.TargetIndex,
+		"targetIndex": args.Input.ToPosition,
 	})
 
 	return &PostResolver{P: post}, nil
@@ -227,7 +227,7 @@ func (r *PostResolver) Text() string {
 	return r.P.Text
 }
 
-// Index resolves Post.text
-func (r *PostResolver) Index() int32 {
-	return int32(r.P.Index)
+// Position resolves Post.text
+func (r *PostResolver) Position() int32 {
+	return int32(r.P.Position)
 }

schema/types/post.graphql

@@ -18,8 +18,8 @@ type Post {
   # The post's text, which purpose depends on the kind
   text: String!
 
-  # The post's index, which is used to sort posts
-  index: Int!
+  # The post's position, used for reordering
+  position: Int!
 }
 
 # Input for the addPost mutation
@@ -64,5 +64,5 @@ input MovePostInput {
   id: String!
 
   # Target index
-  targetIndex: Int!
+  toPosition: Int!
 }