Question

在这种情况下，可以通过注释查看post_id，但是我想从仅具有post资源ID的post constroller中获取提示，注释中的post_id和帖子中的id是相同的ID，因此我试图将两者关联

Class RandomTest:
    def __init__(self, d=None, v=None):
        self.d = d or []
        self.v = v or []
    def add(self, d, v):
        self.d.append(d)
        self.v.append(v)

my_dict = {}

for x in range(100):
    if str(x) not in my_dict:
        my_dict[str(x)] = RandomTest()
    my_dict[str(x)].add(str(x), x)

print(my_dict['1'].d)

['1']

好日志显示错误

所以，请有人为此留个小费？

 def set_post
    @post = Post.find(params[:id])
  end



  def set_comment_post

    @post = Post.find_by(post_id: set_post)
  end

根据请求传递的参数

class PostsController < ApplicationController
  before_action :set_comment_post only: [:comments]


  before_action :set_post, only: [:show, :update, :destroy], except: [:comments]
  before_action :set_user, only: [:show, :update, :destroy, :new]

  # GET /posts
  # GET /posts.json



  def comments

    @comments = @post.comments.order('created_at desc')
    render json: @comments
  end

  # POST /posts
  # POST /posts.json
  def create


    @post = current_user.posts.build(post_params)

    if @post.save

      render json: "Posted successfully", status: 201
    else
      render json: @post.errors, status: :unprocessable_entity
    end
  end

  # PATCH/PUT /posts/1
  # PATCH/PUT /posts/1.json
  def update
    if @post.update(post_params)

      render json: "Posted updated successfully", status: 200
    else
      render json: @post.errors, status: :unprocessable_entity
    end
  end



  private
  def set_user
    @current_user = User.find_by(params[:id])


  end

  # Use callbacks to share common setup or constraints between actions.
  def set_post
    @post = Post.find(params[:id])
  end



  def set_comment_post

    @post = Post.find_by(:post_id => set_post)
  end





  # Never trust parameters from the scary internet, only allow the white list through.
  def post_params
    params.require(:post).permit(:title, :body, :user_id, :posts_count)
  end
end

Answer 1

尚不清楚为什么需要使用两种方法做同样的事情，但我认为您想要的是

如果多个端点需要它，请仅使用before_action。另外，请勿只使用[:only]和[:except]两者。这应该起作用：

class PostsController < ApplicationController
  before_action :set_post, only: [:show, :update, :destroy, :comments]
  before_action :set_user, only: [:show, :update, :destroy, :new]

  def comments
    @comments = @post.comments.order('created_at desc')
    render json: @comments
  end

  def create
    @post = current_user.posts.build(post_params)

    if @post.save
      render json: "Posted successfully", status: 201
    else
      render json: @post.errors, status: :unprocessable_entity
    end
  end

  def update
    if @post.update(post_params)
      render json: "Posted updated successfully", status: 200
    else
      render json: @post.errors, status: :unprocessable_entity
    end
  end

  private
  def set_user
    @current_user = User.find_by(params[:id])
  end

  def set_post
    @post = Post.find(params[:id])
  end

  def post_params
    # add comments attributes if our text field is called 'text'
    params.require(:post).permit(:title, :body, :user_id, :posts_count, comments_attributes: [ :id, :text ] )
  end
end

您可能还需要设置accepts_nested_attributes_for

class Post
  accepts_nested_attributes_for :comments, allow_destroy: true

  has_many :comments, dependent: :destroy
end

然后，您要在前端处理数据，您需要传递带有嵌套字段的帖子表格以供注释。参见https://guides.rubyonrails.org/form_helpers.html#nested-forms

Rails如何关联参数/从其他参数获取参数？

1 个答案: