Mongoid/Rails 4找不到文档错误

Question

我试图在rails 4中使用“外键”，embedded_in和embeds_many的替代方法。我确信有一种方法可以解决这个问题，它对我来说目前为止还有意义

我的模型：

class Line 
    include Mongoid::Document 
    include Mongoid::Timestamps 

    embeds_many :stations 
    field :line, type: String 
    index({ starred: 1 }) 
end 


class Station 
    include Mongoid::Document 
    include Mongoid::Timestamps 
    has_many :routes 
    embedded_in :line, inverse_of: :stations 
    field :name, type: String 
end 

现在我能够创建一个嵌套的途径，如： http://localhost:3000/lines/:line_id/stations 有：

Rails.application.routes.draw do 
    resources :lines do 
    resources :stations 
end 
    resources :routes 
    root 'lines#index' 
end 

我的电台控制器：

class StationsController < ApplicationController 
    before_action :load_line 
    before_action :set_station, only: [:show, :edit, :update, :destroy] 

    # GET /stations 
    # GET /stations.json 
def index 
    @stations = @line.stations 
end 

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

# GET /stations/new 
def new 
    @station = @line.stations.build 
end 

# GET /stations/1/edit 
def edit 
end 

# POST /stations 
# POST /stations.json 
def create 
    @station = @line.stations.build(station_params) 

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

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

# DELETE /stations/1 
# DELETE /stations/1.json 
def destroy 
    @station.destroy 
    respond_to do |format| 
    format.html { redirect_to stations_url, notice: 'Station was successfully destroyed.' } 
    format.json { head :no_content } 
    end 
end 

private 
# Use callbacks to share common setup or constraints between actions. 
def set_station 
    @station = @line.stations.find(params[:id]) 
end 

# Never trust parameters from the scary internet, only allow the white list through. 
def station_params 
    params.require(:station).permit(:name) 
end 

def load_line 
    @line = Line.find(params[:line_id]) 
end 
end 

但是当我参观路线，我得到：

消息：文件（S）未找到班线有ID（S）：line_id。摘要：使用id或id数组调用Line.find时，每个参数必须与数据库中的文档匹配，否则将引发此错误。搜索的是id（s）：：line_id ...（总共1个），但没有找到以下id：：line_id。解决方案：搜索数据库中的id或将Mongoid.raise_not_found_error配置选项设置为false，这将导致返回nil而不是在搜索单个id时引发此错误，或在搜索时仅返回匹配的文档倍数。

Answer 1

在您的浏览器中不打印http://localhost:3000/lines/:line_id/stations但是http://localhost:3000/lines/1/stations！

如果你的routes.rb没有以下你应该添加它。

resources :lines do 
    resources :stations 
end 

PS：请缩进两个规格，他们是ruby程序员之间的惯例。