Rails 4:accepts_nested_attributes_for和大量分配 [英] Rails 4: accepts_nested_attributes_for and mass assignment

问题描述

我正在尝试在Rails 4中复制 railscast#196 .但是，我正在遇到一些问题.

I am trying to reproduce railscast #196 in Rails 4. However, I'm experiencing some problems.

在我的示例中，我尝试生成一个电话簿-每个人可以有多个电话号码

In my example I try to generate a Phonebook - each Person could have multiple PhoneNumbers

这些是我控制器的重要组成部分:

These are important parts of my controller:

class PeopleController < ApplicationController
    def new
        @person = Person.new
        3.times{ @person.phones.build }
    end

    def create
        @person = Person.create(person_params)
        @person.phones.build(params[:person][:phones])

        redirect_to people_path
    end

private

    def person_params
        params.require(:person).permit(:id, :name, phones_attributes: [ :id, :number ])
    end
end

这是我的新观点

<h1>New Person</h1>

<%= form_for :person, url: people_path do |f| %>
    <p>
        <%= f.label :name %> </ br>
        <%= f.text_field :name %>
    </p>

    <%= f.fields_for :phones do |f_num| %>
        <p>
            <%= f_num.label :number %> </ br>
            <%= f_num.text_field :number %>
        </p>
    <% end %>

    <p>
        <%= f.submit %>
    </p>
<% end %>

不必说我的个人模型中有has_many :phones和accepts_nested_attributes_for :phones，而电话模型中有belongs_to :person.

needless to say i have has_many :phones and accepts_nested_attributes_for :phones in the my person model and belongs_to :person in the phone model.

我遇到以下问题:

1. 新格式中只有3个电话号码字段
2. 提交表单时出现错误:

ActiveModel :: ForbiddenAttributesError

ActiveModel::ForbiddenAttributesError

在线

@person.phones.build(params[:person][:phones])

参数:

{"utf8"=>"✓",
 "authenticity_token"=>"l229r46mS3PCi2J1VqZ73ocMP+Ogi/yuYGUCMu7gmMw=",
 "person"=>{"name"=>"the_name",
 "phones"=>{"number"=>"12345"}},
 "commit"=>"Save Person"}

原则上，我希望将整个事情作为表单对象来完成，但是我想，如果我什至没有用accepts_nested_attributes来做到这一点，我就没有机会作为表单对象来做:(

In principle I would like to do this whole thing as a form object, but I think if I don't even get it with accepts_nested_attributes, I have no chance to do it as a form object :(

推荐答案

要在视图中获取三部手机，请将form_for :person更改为form_for @person(您要使用在此处构建的对象)，如下所示:

In order to get three phones in the view change form_for :person to form_for @person (you want to use the object you've built here) as follows:

<%= form_for @person, url: people_path do |f| %>

这也应该修复ForbiddenAttributes错误.

您的create动作可能是:

def create
    @person = Person.create(person_params)

    redirect_to people_path
end

更新:

<%= form_for :person do |f| %>为Person模型创建通用形式，并且不知道您对特定对象(在本例中为new操作中的@person)应用的其他详细信息.您已经将三个phones附加到@person对象，并且@person与:person不同，这就是为什么您在视图中没有看到三个电话字段的原因.请进一步参考: http://apidock.com/rails/ActionView/Helpers/FormHelper/form_for 详细信息.

<%= form_for :person do |f| %> creates a generic form for the Person model and is not aware of the additional details you apply to a specific object (in this case @person in your new action). You've attached three phones to the @person object, and @person is not the same as :person which is why you didn't see three phone fields in your view. Please reference: http://apidock.com/rails/ActionView/Helpers/FormHelper/form_for for further details.

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