Question

我阅读了很多关于`has_one关系和嵌套属性的页面但是没有成功完成这项工作。任何帮助都会很棒。

每个用户has_one网络。我正在尝试以一种形式收集两个属性的信息，但不断获得异常ActiveRecord::AssociationTypeMismatch in UsersController#create

传递的参数是：

{"utf8"=>"âœ“",
 "authenticity_token"=>"I54tm1ovzHEHaXbBLTT+5tqBJv2795sKg978ot3HDBc=",
 "user"=>{"name"=>"Bilbo Baggins",
 "email"=>"bilbo@lotr.com",
 "password"=>"[FILTERED]",
 "password_confirmation"=>"[FILTERED]",
 "network"=>{"home_lng"=>"-87.91894912719727",
 "home_lat"=>"43.03812464542969",
 "center_lng"=>"-87.91894912719727",
 "center_lat"=>"43.03812464542969",
 "radius"=>"500"}},
 "commit"=>"Sign up"}

我猜测Network的参数必须以某种方式显示为network_attributes，但我不确定如何。

控制器：

def create
    @user = User.new(params[:user])
    if (@user.save)
      sign_in @user
      flash[:success] = "One ring to rule them all!"
      redirect_to @user
    else
      @title = "The journey begins..."
      render 'new'
    end
end

查看：

<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :email %>
<%= f.text_field :email %><br />
<%= f.label :password %>
<%= f.password_field :password %>
<%= f.label :password_confirmation, "Confirmation" %>
<%= f.password_field :password_confirmation %>
  <%= f.fields_for @network do |fn| %>
    <%= fn.hidden_field :home_lng %>
    <%= fn.hidden_field :home_lat %>
    <%= fn.hidden_field :center_lng %>
    <%= fn.hidden_field :center_lat %>
    <%= fn.hidden_field :radius %>
  <% end %>

当然还有模特：

class User < ActiveRecord::Base
  attr_accessor :password
  attr_accessible :name, :email, :password, :password_confirmation, :network_attributes, :network
  has_one  :network, :foreign_key => "user_id",
                     :dependent => :destroy

  accepts_nested_attributes_for :network,
                            :reject_if => :all_blank,
                            :allow_destroy => true
end

class Network < ActiveRecord::Base
  attr_accessible :home_lng, :home_lat, :center_lng, :center_lat, :radius
  belongs_to :user
end

谢谢

Answer 1

如果其他人遇到同样的问题，我通过更改解决了这个问题：

<%= f.fields_for @network do |fn| %>至<%= f.fields_for :network do |fn| %>并将:network作为用户模型中的可访问属性删除。

Answer 2

不确定，认为你需要：

<%= f.fields_for @network, :network_attributes do |fn| %>

Answer 3

如果从模型中移除：网络作为可访问的网络将无法确定

尝试在Rails中保存嵌套属性时的ActiveRecord :: AssociationTypeMismatch

3 个答案: