Question

I m trying to write a rails application. I m a ruby-on-rails newbie. I have a User model and a Hobby model.

class User < ActiveRecord::Base
  has_many :hobbies
end

class Hobby < ActiveRecord::Base
  belongs_to :user
end

During the new user registration, I have used a text box where I enter a value for hobby. Then, when I press a button Add hobby , a method in UsersController add_hobby is to be called where I intend to append the value entered for hobby by user to the user i.e @user.hobbies << hobby However, my problem is that the user object has not been saved yet, so there is no way to access a particular user object. How do I get around this problem ?

Answer 1

您可以在您的模版中建立这样的表格:

<%= form_for @user do |user_form| %>
  <%= user_form.text_field :name %>
  <% for hobby in @user.hobbies %>
    <%= user_form.fields_for hobby, :index => hobby do |hobby_form|%>
      <%= hobby_form.text_field :name %>
    <% end %>
  <% end %>
<% end %>

之后在用户模型中添加accepts_nested_attributes_for

class User < ActiveRecord::Base
  has_many :hobbies

  accepts_nested_attributes_for :hobbies, :allow_destroy => true
end

Answer 2

根据我的理解,在用户建立之后,更好地拯救这些孤儿。即便没有用户,也不能挽救用户的ho。

如果你允许用户使用多个影子,客户一方有一片 j。当用户增加一只by子时,添加到 j阵列并更新该页。 (你可以用一些DHTML/Javascript这样做)。当你拯救用户时,你会穿透霍比阵列,在控制器中,你可以分开并拯救这些。

che

同前

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