Question

发布会嵌入许多评论。

_id是帖子的Integer类型字段，但是String一个 - 用于评论。

post.rb：

class Post
  include Mongoid::Document
  include Mongoid::Attributes::Dynamic

  field :_id, type: Integer
  field :title, type: String
  field :content, type: String

  embeds_many :comments
  accepts_nested_attributes_for :comments
end

comment.rb：

class Comment
  include Mongoid::Document
  include Mongoid::Attributes::Dynamic

  field :_id, type: String
  field :content, type: String
  embedded_in :post
end

posts_controller.rb：

class PostsController < ApplicationController
  before_action :set_post, only: [:show, :edit, :update, :destroy]

  # GET /posts
  # GET /posts.json
  def index
    @posts = Post.all
  end

  # GET /posts/1
  # GET /posts/1.json
  def show
  end

  # GET /posts/new
  def new
    @post = Post.new
  end

  # GET /posts/1/edit
  def edit
  end

  # POST /posts
  # POST /posts.json
  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.html { redirect_to @post, notice: 'Post was successfully created.' }
        format.json { render :show, status: :created, location: @post }
      else
        format.html { render :new }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /posts/1
  # PATCH/PUT /posts/1.json
  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to @post, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /posts/1
  # DELETE /posts/1.json
  def destroy
    @post.destroy
    respond_to do |format|
      format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

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

comments_controller.rb：

class CommentsController < ApplicationController
    before_action :set_comment, only: [:show, :edit, :update, :destroy]

    def index
        @post = Post.find(params[:post_id])
        @comments = @post.comments
    end

    def show
    end

    def new
        @post = Post.find(params[:post_id])
        @comment = @post.comments.new
    end

    def edit
        @comment = @post.comments.find(params[:id])
    end

    def create
        @post = Post.find(params[:post_id])
        @comment = @post.comments.new(comment_params)

        respond_to do |format|
            if @comment.save
                format.html { redirect_to post_path(@post), notice: 'Comment was successfully created.' }
                format.json { render :show, status: :created, post: @comment }
            else
                format.html { render :new }
                format.json { render json: @comment.errors, status: :unprocessable_entity }
            end
        end
    end

    def update
    end

    def destroy
    end

    private
        def set_comment
            @post = Post.find(params[:post_id])
            @comment = @post.comments.find(params[:id])
        end

        def comment_params
            params.require(:comment).permit(:_id, :content)
        end
end

当我添加评论时，它只保存评论的内容字段的值，而不保存我输入的_id。虽然这适用于帖子模型：

> db.posts.findOne()
{
    "_id" : 23,
    "title" : "First Post",
    "content" : "Text of the 1st post",
    "comments" : [
        {
            "content" : "Comment for the 1st post"
        },
        {
            "content" : "2nd comment"
        },
        {
            "content" : "asdfagzcbzcv"
        }
    ]
}

我在github上有这个应用程序，可在https://github.com/tenzan/blog.git

公开

Answer 1

让_id字段清理:)

从post Post.find( params[:post_id] )获得的post.comments.find( params[:comment_id] )对象，您可以post.comments[ params[:comment_id] ]。

custom_id没有优化（如果我正确理解你要做的事情）。

如果您真的希望向用户显示更清晰的评论ID，您可以自己实现acts_as_list这样的字段或使用gem {{1}}。

_id值未保存为嵌入文档

1 个答案: