add comment repository for postgres.

models/comment.go

@@ -16,6 +16,24 @@ type Comment struct {
 	Source        string    `bson:"source"`
 }
 
+func (comment *Comment) ApplyUpdate(update CommentUpdate) {
+	if update.Source != nil {
+		comment.Source = *update.Source
+	}
+	if update.CharacterName != nil {
+		comment.CharacterName = *update.CharacterName
+	}
+	if update.CharacterID != nil {
+		comment.CharacterID = *update.CharacterID
+	}
+	if update.Subject != nil {
+		comment.Subject = *update.Subject
+	}
+	if update.FictionalDate != nil {
+		comment.FictionalDate = *update.FictionalDate
+	}
+}
+
 // IsChangeObject is an interface implementation to identify it as a valid
 // ChangeObject in GQL.
 func (*Comment) IsChangeObject() {