Add /post_replacements.json, /posts/1234/replacements.json.

app/controllers/post_replacements_controller.rb

@@ -0,0 +1,11 @@
+class PostReplacementsController < ApplicationController
+  respond_to :html, :xml, :json
+  before_filter :approver_only, except: [:index]
+
+  def index
+    params[:search][:post_id] = params.delete(:post_id) if params.has_key?(:post_id)
+    @post_replacements = PostReplacement.search(params[:search]).paginate(params[:page], limit: params[:limit])
+
+    respond_with(@post_replacements)
+  end
+end

app/models/post_replacement.rb

@@ -61,4 +61,32 @@ class PostReplacement < ActiveRecord::Base
     post.distribute_files
     post.update_iqdb_async
   end
+
+  module SearchMethods
+    def search(params = {})
+      q = all
+
+      if params[:creator_id].present?
+        q = q.where(creator_id: params[:creator_id].split(",").map(&:to_i))
+      end
+
+      if params[:creator_name].present?
+        q = q.where(creator_name: User.name_to_id(params[:creator_name]))
+      end
+
+      if params[:id].present?
+        q = q.where(id: params[:id].split(",").map(&:to_i))
+      end
+
+      if params[:post_id].present?
+        q = q.where(post_id: params[:post_id].split(",").map(&:to_i))
+      end
+
+      q = q.order("created_at DESC")
+
+      q
+    end
+  end
+
+  extend SearchMethods
 end