Move post replacement create action to post replacements controller.

app/controllers/post_replacements_controller.rb

@@ -2,10 +2,27 @@ class PostReplacementsController < ApplicationController
   respond_to :html, :xml, :json
   before_filter :approver_only, except: [:index]
 
+  def new
+    @post = Post.find(params[:post_id])
+  end
+
+  def create
+    @post = Post.find(params[:post_id])
+    @post_replacement = @post.replace!(create_params)
+
+    flash[:notice] = "Post replaced"
+    respond_with(@post_replacement, location: @post)
+  end
+
   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
+
+private
+  def create_params
+    params.require(:post_replacement).permit(:replacement_url)
+  end
 end