Question

我有一个User模型，如下所示

class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable
  has_many :company_users
  accepts_nested_attributes_for :company_users, :allow_destroy => true

  has_many :companies, :through => :company_users
  has_many :roles, :through => :company_users
end

及其相关模型CompanyUser如下，

class CompanyUser < ActiveRecord::Base
  belongs_to :user
  belongs_to :company
  belongs_to :role
end

我正在尝试构建如下的关联，但似乎无法正常工作

  # GET /users/new
  def new
    @user = User.new
    @user.company_users.build
  end

查看文件如下，

<%= form_for(@user) do |f| %>
  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :email %><br>
    <%= f.text_field :email %>
  </div>
  <h3>Companies and Roles</h3>
  <div class="field">
    <% f.fields_for :company_users do |cu| %>
       <p>
         <%= cu.label :company_id %>
         <%= cu.text_field :company_id%>
         <%= cu.label :role_id %>
         <%= cu.text_field :role_id %>
         <%= cu.check_box :_destroy %>
         <%= cu.label :_destroy, 'delete' %>
        </p>
     <% end %>
    <p>
       <%= f.submit 'Add to user', :name => "add_company_user" %>
       <%= f.submit 'Delete from user', :name => "remove_company_user" %>
    </p>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

我想弄清楚它出了什么问题。

Answer 1

您错过了=，因此fields_for块未呈现给该页面。改变这一行

<% f.fields_for :company_users do |cu| %>

到

<%= f.fields_for :company_users do |cu| %>

Rails .build assosciation not working rails

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