Add ability to use nested only parameter

- The only string works much the same as before with its comma separation
-- Nested includes are indicated with square brackets "[ ]"
-- The nested include is the value immediately preceding the square brackets
-- The only string is the comma separated string inside those brackets
- Default includes are split between format types when necessary
-- This prevents unnecessary includes from being added on page load
- Available includes are those items which are allowed to be accessible to the user
-- Some aren't because they are sensitive, such as the creator of a flag
-- Some aren't because the number of associated items is too large
- The amount of times the same model can be included to prevent recursions
-- One exception is the root model may include the same model once
--- e.g. the user model can include the inviter which is also the user model
-- Another exception is if the include is a has_many association
--- e.g. artist urls can include the artist, and then artist urls again

app/controllers/forum_post_votes_controller.rb

@@ -3,7 +3,7 @@ class ForumPostVotesController < ApplicationController
   before_action :member_only, only: [:create, :destroy]
 
   def index
-    @forum_post_votes = ForumPostVote.includes(creator: [], forum_post: [:topic]).paginated_search(params, count_pages: true)
+    @forum_post_votes = ForumPostVote.paginated_search(params, count_pages: true).includes(model_includes(params))
     respond_with(@forum_post_votes)
   end
 
@@ -21,6 +21,14 @@ class ForumPostVotesController < ApplicationController
 
   private
 
+  def default_includes(params)
+    if ["json", "xml"].include?(params[:format])
+      []
+    else
+      [:creator, {forum_post: [:topic]}]
+    end
+  end
+
   def forum_post_vote_params
     params.fetch(:forum_post_vote, {}).permit(:score)
   end