嵌套属性用空父项预填充子数据

Question

我遇到了需要为 fields_for 提供空表格预填充数据的情况。让我举例说明

协会

class User < ApplicationRecord
  has_one :account, foreign_key: :user_id

  accepts_nested_attributes_for :account
end

Class Account
  belongs_to :user
end

现在我在仪表板索引页上有一个表单。

<%= form_for @account, :url => account_path, html: { class: "abc" } do |f| %>
  <%= f.hidden_field :user_id, :value => current_user.id %>
  <%= f.fields_for :user do |user| %>
    <div class="medium-4 columns">
      <label>First Name</label>
      <%= user.text_field :first_name , class: 'xyz', data: {input: 'someinput'} %>
    </div>
    <div class="medium-4 columns">
      <label><b>Last Name<span class="invalid_message"> This field is required</span></b></label>
      <%= user.text_field :last_name, class: 'xyz', data: {input: 'someinput'} %>
    </div>
  <% end %>

  <div class="medium-4 medium-offset-2 columns">
    <label>Phone Number</label>
    <%= f.text_field :phone_number, class: 'xyz', data: {input: 'someinput'} %> 
  </div>
<% end %>

控制器

 class AccountsController < ApplicationController

      def create
        @account = Account.new(account_params)
        if @account.save
          render json: {status: 'successfull'}
        else
          render json: {error: "#{@account.errors.full_messages}"}, status: 400
        end
      end

      private
      def account_params
        params.require(:account).permit(:phone_number, :user_id, user_attributes: [:first_name, :last_name])
      end
    end

    class DashboardController < ApplicationController

      def index
        ##I will always have current_user. For the account it will be blank for the first time
        if current_user.account.blank?
          @account = Account.new
        else
          @account = current_user.account
        end
      end
    end

参数

{"utf8"=>"✓", "authenticity_token"=>"asdasdadadadadsadadadadadQpy0tA82asdaalAgJsUcNk1i/kGETfZqnuQA==", "account"=>{"user_id"=>"123", "user"=>{"first_name"=>"sd", "last_name"=>"ad"}, "phone_number"=>"1212"}}

有两个问题
1) 名字和姓氏没有被预填
2) 参数不正确。应该是account_attributes而不是参数中的account

注意：在我的例子中，@account 第一次是空白的，但用户对象（即当前用户）仍然有 first_name 和 last_name，我需要预先填写fields_for。另外，我需要一种更新名字和姓氏的方法

谁能告诉我哪里做错了

Answer 1

将 @account = Account.new 更改为 @account = current_user.build_account。您应该会看到预填充的字段。

Answer 2

终于，我找到了解决办法。我做错了几件事

1) 在form_for中应该是@user而不是@account
2) 然后在控制器中，此表单将始终将其发送到更新操作而不是创建。原因是我将始终拥有 current_user，因此 rails 将自动检查对象 (current_user) 是否存在，而不是发送到创建，而是发送到更新操作
3) 最后，在使用一对一关联时，我们需要加载父对象并构建子对象。

<%= form_for @user, :url => user_path, html: { class: "abc" } do |f| %>
    <div class="medium-4 columns">
      <label>First Name</label>
      <%= f.text_field :first_name , class: 'xyz', data: {input: 'someinput'} %>
    </div>
    <div class="medium-4 columns">
      <label><b>Last Name<span class="invalid_message"> This field is required</span></b></label>
      <%= f.text_field :last_name, class: 'xyz', data: {input: 'someinput'} %>
    </div>
  <%= f.fields_for :account do |account_info| %>
    <div class="medium-4 medium-offset-2 columns">
      <label>Phone Number</label>
    <%= account_info.text_field :phone_number, class: 'xyz', data: {input: 'someinput'} %> 
    </div> 
  <% end %>
<% end %>


class UsersController < ApplicationController

      def update
        if current_user.update(account_params)
          render json: {status: 'successfull'}
        else
          render json: {error: "#{@account.errors.full_messages}"}, status: 400
        end
      end

      private
      def account_params
        params.require(:account).permit(:first_name, :last_name, account_attributes: [:phone_number])
      end
    end

    class DashboardController < ApplicationController

      def index
        ##I will always have current_user. For the account it will be blank for the first time
        if current_user.account.blank?
           @account = current_user
           @account.build_account
        end
      end
    end

嵌套属性用空父项预填充子数据

nested attributes prefilled child data with empty parent

ruby-on-rails

ruby

ruby-on-rails-5.2

fields-for