Add artist commentary listing and search

related to #2084, fixes #2085

app/models/artist_commentary.rb

@@ -5,6 +5,46 @@ class ArtistCommentary < ActiveRecord::Base
   has_many :versions, :class_name => "ArtistCommentaryVersion", :dependent => :destroy, :foreign_key => :post_id, :primary_key => :post_id, :order => "artist_commentary_versions.id ASC"
   after_save :create_version
 
+  module SearchMethods
+    def text_matches(query)
+      escaped_query = query.to_escaped_for_sql_like
+      where("original_title ILIKE ? ESCAPE E'\\\\' OR original_description ILIKE ? ESCAPE E'\\\\' OR translated_title ILIKE ? ESCAPE E'\\\\' OR translated_description ILIKE ? ESCAPE E'\\\\'", escaped_query, escaped_query, escaped_query, escaped_query)
+    end
+
+    def post_tags_match(query)
+      joins(:post).where("posts.tag_index @@ to_tsquery('danbooru', ?)", query.to_escaped_for_tsquery_split)
+    end
+
+    def search(params)
+      q = scoped
+      params = {} if params.blank?
+
+      if params[:text_matches].present?
+        q = q.text_matches(params[:text_matches])
+      end
+
+      if params[:original_present] == "yes"
+        q = q.where("(original_title is not null and original_title != '') or (original_description is not null and original_description != '')")
+      elsif params[:original_present] == "no"
+        q = q.where("(original_title is null or original_title = '') and (original_description is null or original_description = '')")
+      end
+
+      if params[:translated_present] == "yes"
+        q = q.where("(translated_title is not null and translated_title != '') or (translated_description is not null and translated_description != '')")
+      elsif params[:translated_present] == "no"
+        q = q.where("(translated_title is null or translated_title = '') and (translated_description is null or translated_description = '')")
+      end
+
+      if params[:post_tags_match].present?
+        q = q.post_tags_match(params[:post_tags_match])
+      end
+
+      q
+    end
+  end
+
+  extend SearchMethods
+
   def original_present?
     original_title.present? || original_description.present?
   end