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为 has_one 多态模型提交嵌套表单时出现批量分配错误。该表单试图基于多态关联 Rails 指南创建 Employee 和 Picture 实例。

对于 has_one 多态模型的嵌套创建表单的任何功能示例，我将不胜感激！我知道有大量关于批量分配错误的问题，但我从未见过多态关联的工作示例。

楷模

class Picture < ActiveRecord::Base
    belongs_to :illustrated, :polymorphic => true
    attr_accessible :filename, :illustrated
end

class Employee < ActiveRecord::Base
    has_one :picture, :as => :illustrated
    accepts_nested_attributes_for :picture
    attr_accessible :name, :illustrated_attribute
end

迁移

create_table :pictures do |t|
    t.string :filename
    t.references :illustrated, polymorphic: true
end

create_table :employees do |t|
    t.string :name
end

控制器/employees_controller.rb

...
def new
    @employee = Employee.new
    @employee.picture = Picture.new
end

def create
    @employee = Employee.new(params[:employee])
    @employee.save
end
...

错误

Can't mass-assign protected attributes: illustrated

app/controllers/employees_controller.rb:44:in `create'

{"utf8"=>"✓", "authenticity_token"=>"blah"
 "employee"=>{"illustrated"=>{"filename"=>"johndoe.jpg"},
 "name"=>"John Doe"},
 "commit"=>"Create Employee"}

在模型中，我尝试了 :illustrated、:picture、:illustrated_attribute、:illustrated_attributes、:picture_attribute、:picture_attributes 等的所有排列。有什么提示或示例吗？

编辑：

_form.html.erb

<%= form_for(@employee) do |f| %>

  <%= f.fields_for :illustrated do |form| %>
    <%= form.text_field :filename %>
  <% end %>

    <%= f.text_field :name %>
    <%= f.submit %>

<% end %>
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1 回答 1

0

You need to specify the nested_attributes appropriately. accepts_nested_attributes_for takes the name of the association as parameter and then you need to add the same assoc_attributes to your attr_accessible. So change your Employee model to

class Employee < ActiveRecord::Base
  has_one :picture, :as => :illustrated
  accepts_nested_attributes_for :picture
  attr_accessible :name, :picture_attribute
end

And change the field_for line in the view code to

<%= f.fields_for :picture do |form| %>
于 2013-02-09T22:28:43.453 回答