Fix #4053: Add disapproval index improvements.

Add search form to /moderator/post/disapprovals.

app/models/post_disapproval.rb

@@ -8,6 +8,7 @@ class PostDisapproval < ApplicationRecord
   validates_inclusion_of :reason, :in => %w(legacy breaks_rules poor_quality disinterest)
 
   scope :with_message, -> {where("message is not null and message <> ''")}
+  scope :without_message, -> {where("message is null or message = ''")}
   scope :breaks_rules, -> {where(:reason => "breaks_rules")}
   scope :poor_quality, -> {where(:reason => "poor_quality")}
   scope :disinterest, -> {where(:reason => ["disinterest", "legacy"])}
@@ -43,4 +44,37 @@ class PostDisapproval < ApplicationRecord
       PostVote.create(:score => -1, :post_id => post_id)
     end
   end
+
+  concerning :SearchMethods do
+    class_methods do
+      def post_tags_match(query)
+        where(post_id: PostQueryBuilder.new(query).build.reorder(""))
+      end
+
+      def search(params)
+        q = super
+
+        q = q.attribute_matches(:post_id, params[:post_id])
+        q = q.attribute_matches(:user_id, params[:user_id])
+        q = q.attribute_matches(:message, params[:message_matches])
+        q = q.search_text_attribute(:message, params)
+
+        q = q.post_tags_match(params[:post_tags_match]) if params[:post_tags_match].present?
+        q = q.where(user_id: User.search(name_matches: params[:creator_name])) if params[:creator_name].present?
+        q = q.where(reason: params[:reason]) if params[:reason].present?
+
+        q = q.with_message if params[:has_message].to_s.truthy?
+        q = q.without_message if params[:has_message].to_s.falsy?
+
+        case params[:order]
+        when "post_id", "post_id_desc"
+          q = q.order(post_id: :desc, id: :desc)
+        else
+          q = q.apply_default_order(params)
+        end
+
+        q.apply_default_order(params)
+      end
+    end
+  end
 end