Question

当我提交表单以保存条目时，嵌套值（在Ride模型中）命名为＆＃39; test＆＃39;没有得救。

我的entry_params方法是否正确允许嵌套属性通过？在检查输入对象时，我在输入记录中没有ride_id值：

--- !ruby/object:Entry
attributes:
  id: 47
  show_date: 0008-08-08
  user_id: 
  ride_id: 
  created_at: 2014-07-04 21:08:49.294361000 Z
  updated_at: 2014-07-04 21:08:49.294361000 Z

我有模特：

class Entry < ActiveRecord::Base    
  has_many :rides, :dependent => :destroy    
  has_many :horses, :through => :rides, :dependent => :destroy    
  has_many :riders, :through => :rides, :dependent => :destroy    
end    

class Ride < ActiveRecord::Base    
  belongs_to :entry    
  has_many :horses, :dependent => :destroy    
  has_many :riders, :dependent => :destroy    
end

我的部分输入控制器文件：

class EntriesController < ApplicationController
  before_action :set_entry, only: [:show, :edit, :update, :destroy]

def new
  @entry = Entry.new
  1.times do
    @entry.rides.build
  end
end

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

def destroy
  @entry.destroy
  respond_to do |format|
    format.html { redirect_to entries_path, notice: 'Entry was successfully deleted.' }
    format.json { head :no_content }
  end
end 

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

  def entry_params
    params.require(:entry).permit(:show_date, ride_attributes: [:test])
  end

端

我的表单提交具有嵌套属性的条目：

<%= form_for (@entry), :url => entries_path do |f| %>
<p>
  <%= f.label :show_date %><br>
  <%= f.text_field :show_date %>
</p>
<%= f.fields_for :rides do |builder| %>  
<p>  
  <%= builder.label :test %><br>
  <%= builder.text_field :test %>
</p>
<% end %>   
<p>
<%= f.submit %>
</p>
<% end %>

Answer 1

问题是您 accepts_nested_attributes_for :rides 模型中缺少 Entry 。

class Entry < ActiveRecord::Base    
  has_many :rides, :dependent => :destroy    
  has_many :horses, :through => :rides, :dependent => :destroy    
  has_many :riders, :through => :rides, :dependent => :destroy  
  accepts_nested_attributes_for :rides 
end

来自 API

嵌套属性允许您保存关联记录的属性通过父母

因此，在您的情况下， rides_attributes 未保存，因为您的 {中没有 accepts_nested_attributes_for :rides {1}} 模型

此外 Entry 应该如下所示

entry_params

您有 def entry_params params.require(:entry).permit(:show_date, rides_attributes: [:test]) end ，因此 has_many :rides 不是 rides_attributes 。

Rails 4.1.1相关模型属性与嵌套表单不保存

1 个答案: