Rails 3 - has_many通过嵌套表单

Question

我正在尝试使用嵌套表单,但在保存时不断收到此错误 -

uninitialized constant User::Userplan

这是我的型号代码 -

用户

class User < ActiveRecord::Base 
  has_many :userplans
  has_many :plans, :through => :userplans
  accepts_nested_attributes_for :userplans

UserPlan

class UserPlan < ActiveRecord::Base
 belongs_to :plan
 belongs_to :user

计划

class Plan < ActiveRecord::Base
 has_many :userplans
 has_many :users, :through => :userplans

形成

<%= form_for(@user) do |f| %>
 <%= hidden_field_tag "user[userplans][plan_id]", 2 %>
 <%= f.text_field :first_name %></p>

我知道使用hidden_​​field_tag是错误的,但我不确定更好的方法

谢谢你的帮助!

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Answer 1

我认为你的问题在于你的协会的命名。由于您的UserPlan模型是 CamelCased <- 这样，Rails 将其名称“制表”为:user_plans，而不是:userplan。正如您所看到的，您的错误源于 Rails 在应该Userplan寻找 时却无法找到UserPlan。

用户：

class User < ActiveRecord::Base 
  has_many :user_plans
  has_many :plans, :through => :user_plans
  accepts_nested_attributes_for :user_plans

计划：

class Plan < ActiveRecord::Base
  has_many :user_plans
  has_many :users, :through => :user_plans

看法：

<%= form_for(@user) do |f| %>
 <%= hidden_field_tag "user[user_plans][plan_id]", 2 %>
 <%= f.text_field :first_name %></p>

关于hidden_field_tag，您究竟想做什么？也许你应该提出另一个问题？

希望这可以帮助！