gistflow/gistflow

class Posts::CommentsController < ApplicationController
  cache_sweeper :user_sweeper
  cache_sweeper :comment_sweeper
  
  def create
    @post = find_post(params[:post_id])
    @new_comment = @post.comments.build(params[:comment]) do |comment|
      comment.user = current_user
    end

    if @new_comment.save
      @comment = @post.comments.build do |comment|
        comment.user = current_user
      end
      render json: { form: render_form(:build), comment: render_comment }
    else
      render_json_error("We are sorry, but comment couldn't be saved.")
    end
  end
  
  def build
    @post = find_post(params[:post_id])
    @comment = @post.comments.build(params[:comment]) do |comment|
      comment.user = current_user
    end
    render json: { form: render_form(:build) }
  end
  
  def preview
    @post = find_post(params[:post_id])
    @comment = @post.comments.build(params[:comment]) do |comment|
      comment.user = current_user
    end
    render json: { form: render_form(:preview) }
  end
  
  def edit
    @comment = Comment.find(params[:id])
    authorize! :edit, @comment
    render json: { form: render_form(:edit) }
  end
  
  def update
    @new_comment = Comment.find(params[:id])
    authorize! :edit, @new_comment
    
    if @new_comment.update_attributes(params[:comment])
      render json: { comment: render_comment }
    else
      render_json_error("We are sorry, but comment couldn't be updated.")
    end
  end

  def destroy
    comment = Comment.find(params[:id])
    authorize! :destroy, comment
    
    comment.mark_deleted
    render json: { message: 'Comment was deleted.' }
  end
  
protected
  
  def find_post(id)
    Post.find_by_param id
  end
  
  def render_form(action)
    @action = action
    render_to_string(inline: "<%= render partial: 'form', locals: { comment: @comment, action: @action } %>")
  end
  
  def render_comment
    render_to_string(inline: "<%= render partial: 'comment', locals: { comment: @new_comment } %>")
  end
end