gistfile1.txt

 def create

   if params[:tags]
     params[:tags].each do |tag|
       @discussion.discussion_tags.create!(
         taggable_id: tag['taggable_id'],
         taggable_type: tag['taggable_type'].singularize.capitalize,
         position: @discussion.discussion_tags.count + 1
       )
     end
     if @discussion.save
       render json: @discussion, status: 200
     else
       render json: { errors: @discussion.errors.full_messages }, status: 422
     end
   else
     if @discussion.save
       render json: @discussion, status: 200
     else
       render json: { errors: @discussion.errors.full_messages }, status: 422
     end
   end
 end