在rails中初始化關聯對象

Question

我有一些麻煩來填充我的關聯對象。

我有關聯的對象，我嘗試用表單數據填充本地數據庫的表格，我可以填充建築物和組成它自己的所有對象：light_reseller，舞臺，傢俱，位置。但我沒有找到如何填補舞臺和 傢俱的組成部分「點」！

這裏是我的模型building.rb

class Building < ActiveRecord::Base 
has_many :stage, dependent: :destroy 
has_many :furniture, dependent: :destroy 
has_one :light_reseller, dependent: :destroy 
has_one :location, dependent: :destroy 
accepts_nested_attributes_for :light_reseller, :location, :stage, :furniture, :allow_destroy => true 
end 

class LightReseller < ActiveRecord::Base 
    belongs_to :building 
end 

class Location < ActiveRecord::Base 
    belongs_to :building 
end 

class Stage < ActiveRecord::Base 
    belongs_to :building 
    has_many :points, dependent: :destroy 
    accepts_nested_attributes_for :points 
end 

class Furniture < ActiveRecord::Base 
    belongs_to :building 
    has_many :points, dependent: :destroy 
    accepts_nested_attributes_for :points 
end 

class Point < ActiveRecord::Base 
    belongs_to :furniture 
    belongs_to :stage 
end 

我用一個表格填寫我的對象：

<%= form_for (@building) do |f| %> 
<% if @building.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@building.errors.count, "error") %> prohibited this store from being 
     saved:</h2> 

     <ul> 
     <% @building.errors.full_messages.each do |message| %> 
      <li><%= message %></li> 
     <% end %> 
     </ul> 
    </div> 
<% end %> 

<div class="field"> 
    <h2>Store</h2> 
    <%= f.label :name %><br> 
    <%= f.text_field :name, class: "form-control" %> 
    <%= f.fields_for :location do |loc| %> 
     <%= loc.label :address %><br> 
     <%= loc.text_field :address, class: "form-control" %> 
     <%= loc.label :city %><br> 
     <%= loc.text_field :city, class: "form-control" %> 
    <% end %> 
    <%= f.fields_for :light_reseller do |lr| %> 
     <%= lr.label :"light_reseller name" %><br> 
     <%= lr.text_field :name, class: "form-control" %> 
    <% end %> 
    <h2>Stage</h2> 
    <%= f.fields_for :stage do |ft| %> 
     <%= ft.label :name %><br> 
     <%= ft.text_field :name, class: "form-control" %> 
     <%= ft.fields_for :point do |pt| %> 
      <%= pt.label :"point value" %><br> 
      <%= pt.text_field :val, class: "form-control" %> 
     <% end %> 
     <h3>Stage entries</h3> 
     <%= ft.fields_for :entrie do |et| %> 
      <%= et.label :"entrie name" %><br> 
      <%= et.text_field :name, class: "form-control" %> 
      <%= et.fields_for :point do |ept| %> 
       <%= ept.label :"point value" %><br> 
       <%= ept.text_field :val, class: "form-control" %> 
      <% end %> 
     <% end %> 
    <% end %> 

    <%= f.fields_for :furniture do |ft| %> 
     <h2>Furniture</h2> 
     <%= ft.label :name %><br> 
     <%= ft.text_field :name, class: "form-control" %> 
     <%= ft.fields_for :point do |pt| %> 
      <%= pt.label :"point value" %><br> 
      <%= pt.text_field :val, class: "form-control" %> 
     <% end %> 
     <%= ft.fields_for :point do |pt| %> 
      <%= pt.label :"point value" %><br> 
      <%= pt.text_field :val, class: "form-control" %> 
     <% end %> 
    <% end %> 
</div> 
<div class="actions"> 
    <%= f.submit "Add a Store", class: "btn btn-default"%> 
</div> 
<% end %> 

，這裏是我的控制器：

class BuildingsController < ApplicationController 
    before_action :set_building, only: [:show, :edit, :update, :destroy] 

    def index 
    @buildings = Building.all 
    end 

def new 
    @building = Building.new 
    @building.build_location 
    @building.build_light_reseller 
    @building.furniture.new 
    @building.stage.build 
end 

def show 
end 

def create 
    @building = Building.new(buildings_params) 
    respond_to do |format| 
    if @building.save 
     format.html { redirect_to @building, notice: 'building was successfully created.' } 
     format.json { render :index, status: :created, location: @building } 
    else 
     format.html { render :new } 
     format.json { render json: @building.errors, status: :unprocessable_entity } 
    end 
    end 
end 

def update 
    respond_to do |format| 
    if @building.update(buildings_params) 
    format.html { redirect_to @building, notice: 'building was successfully updated.' } 
    format.json { render :show, status: :ok, location: @buildings } 
    else 
    format.html { render :edit } 
    format.json { render json: @buildings.errors, status: :unprocessable_entity } 
    end 
    end 
    end 

    def destroy 
    @building.destroy 
    respond_to do |format| 
    format.html { redirect_to buildings_path, notice: 'building was successfully destroyed.' } 
    format.json { head :no_content } 
    end 
    end 

    private 
    def set_building 
    @building = Building.find(params[:id]) 
    end 

    def buildings_params 
    params.require(:building).permit(:name, location_attributes:[:address, :city], light_reseller_attributes:[:name], furniture_attributes:[:name, point_attributes:[:val]], stage_attributes:[:name, point_attributes:[:val]]) 
    end 

所以，當我提交我的表格，我的控制器收到這些數據：

"building"=>{"name"=>"Fnac", "location_attributes"=>{"address"=>"12 bird road", "city"=>"Paris"}, "light_reseller_attributes"=>{"name"=>"Marc"}, "stage_attributes"=>{"0"=>{"name"=>"First", "point"=>{"val"=>"1235"}}}, "furniture_attributes"=>{"0"=>{"name"=>"shelf", "point"=>{"val"=>"45"}}}} 

Answer 1

你有關係has_many :points與傢俱和階段，所以你需要改變

<%= ft.fields_for :point do |pt| %> 

到

<%= ft.fields_for :points do |pt| %> 

而且在也改變point_attributes到points_attributes你的buildings_params。

與上述一起嘗試以下更改。

class Building < ActiveRecord::Base 
    has_many :stages, dependent: :destroy 
    has_many :furnitures, dependent: :destroy 
    has_one :light_reseller, dependent: :destroy 
    has_one :location, dependent: :destroy 
    accepts_nested_attributes_for :light_reseller, :location, :stages, :furnitures, :allow_destroy => true 
end 


def new 
    @building = Building.new 
    @building.build_location 
    @building.build_light_reseller 
    @building.furnitures.build 
    @building.stages.build 
end 

def buildings_params 
    params.require(:building).permit(:name, location_attributes:[:address, :city], light_reseller_attributes:[:name], furnitures_attributes:[:name, points_attributes:[:val]], stages_attributes:[:name, points_attributes:[:val]]) 
end 

<%= f.fields_for :stage do |ft| %>到<%= f.fields_for :stages do |ft| %>

和

<%= f.fields_for :furniture do |ft| %>到<%= f.fields_for :furnitures do |ft| %>