API: remove various associated fields included by default.

Remove various associated fields that were included by default on
certain endpoints. API users can use the only param to include the
full association if they need these fields.

* /artists.json: urls.
* /artist_urls.json: artist.
* /comments.json: creator_name and updater_name.
* /notes.json: creator_name.
* /pools.json: creator_name.
* /posts.json: uploader_name, children_ids, pixiv_ugoira_frame_data.
* /post_appeals.json: is_resolved.
* /post_versions.json: updater_name.
* /uploads.json: uploader_name.

app/models/post.rb

@@ -971,10 +971,6 @@ class Post < ApplicationRecord
         self.uploader_ip_addr = CurrentUser.ip_addr
       end
     end
-
-    def uploader_name
-      uploader.name
-    end
   end
 
   module PoolMethods
@@ -1220,12 +1216,6 @@ class Post < ApplicationRecord
     def has_visible_children
       has_visible_children?
     end
-
-    def children_ids
-      if has_children?
-        children.map(&:id).join(' ')
-      end
-    end
   end
 
   module DeletionMethods
@@ -1382,24 +1372,13 @@ class Post < ApplicationRecord
   module ApiMethods
     def api_attributes
       attributes = super
-      attributes += [:uploader_name, :has_large, :has_visible_children, :children_ids, :is_favorited?] + TagCategory.categories.map {|x| "tag_string_#{x}".to_sym}
+      attributes += [:has_large, :has_visible_children, :is_favorited?] + TagCategory.categories.map {|x| "tag_string_#{x}".to_sym}
       attributes += [:file_url, :large_file_url, :preview_file_url] if visible?
       attributes -= [:md5, :file_ext] if !visible?
       attributes -= [:fav_string] if !CurrentUser.is_moderator?
       attributes
     end
 
-    def associated_attributes
-      [:pixiv_ugoira_frame_data]
-    end
-
-    def as_json(options = {})
-      options ||= {}
-      options[:include] ||= []
-      options[:include] += associated_attributes
-      super(options)
-    end
-
     def legacy_attributes
       hash = {
         "has_comments" => last_commented_at.present?,