Implement forum topic voting and tag change pruning (#3580)

app/controllers/forum_post_votes_controller.rb

@@ -0,0 +1,32 @@
+class ForumPostVotesController < ApplicationController
+  respond_to :js
+  before_action :load_forum_post
+  before_action :load_vote, only: [:destroy]
+  before_action :member_only
+
+  def create
+    @forum_post_vote = @forum_post.votes.create(forum_post_vote_params)
+    respond_with(@forum_post_vote)
+  end
+
+  def destroy
+    @forum_post_vote.destroy
+    respond_with(@forum_post_vote)
+  end
+
+private
+  
+  def load_vote
+    @forum_post_vote = @forum_post.votes.where(creator_id: CurrentUser.id).first
+    raise ActiveRecord::RecordNotFound.new if @forum_post_vote.nil?
+  end
+
+  def load_forum_post
+    @forum_post = ForumPost.find(params[:forum_post_id])
+  end
+  
+  def forum_post_vote_params
+    params.fetch(:forum_post_vote, {}).permit(:score)
+  end
+
+end