libr-2/app/controllers/api/v1/posts_controller.rb

class Api::V1::PostsController < Api::V1::ApplicationController

  before_action :permit_params, :map_post_type, :get_post, only: [:create]
  before_action :load_post, only: [:add_viewed_times, :show]

  skip_before_action :authenticate_user_from_token, only: [:show]

  before_action :fetch_current_user

  after_action :process_post, only: :create

  POST_TYPE = {
    :ARTICLE => 'article',
    :WEB_PAGE => 'web_page'
  }

  def create
    if @current_user.share_instances.where(sharable: @post).empty?
      share_instance = @current_user.share_instances.create! sharable: @post, description: params[:description]
      render json: share_instance.to_json(include: :sharable)
    else
      render json: {message: '请勿重复分享同一资源'}, status: 409
    end
  end

  def show
    render json: @target_post, serializer: PostSerializer
  end

  def index
    render json: @current_user.share_instances.page(params[:page]), each_serializer: ShareInstanceSerializer
  end

  def add_viewed_times
    @target_post.increment!(:viewed_times)
    render nothing: true
  end

  def liked_posts
    ids = Like.where(user_id: @current_user.id).order(:created_at).pluck(:likable_id)
    render json: Post.where(id: ids).page(params[:page]), each_serializer: EachPostSerializer
  end

  def bookmarked_posts
    ids = Favorite.where(user_id: @current_user.id).order(:created_at).pluck(:favoritable_id)
    render json: Post.where(id: ids).page(params[:page]), each_serializer: EachPostSerializer
  end

  def search
    params.permit(:keywords)
    render json: Post.where('title LIKE ?',"%#{params[:keywords]}%").page(params[:page]), each_serializer: EachPostSerializer
  end

  private

  def permit_params
    params.permit(:url, :type, :description)
  end

  def get_post
    begin
      @post = Post.find_or_create_by!(url: params[:url], type: @type)
    rescue ActiveRecord::RecordInvalid
      return render json: {msg: '缺少参数，校验失败'}, status: 400
    end

  end

  def map_post_type
    case params[:type]
      when 'article'
        @type = 'Article'
      when 'page'
        @type = 'WebPage'
      else
        return render json: {msg: 'Post 类型不合法'}, status: 400
    end
  end

  def process_post
    unless @post.processed
      ProcessPostWorker.perform_async @post.url
    end
  end
end