Question

我不确定我是否正确地提出这个问题，或者我太累了以至于显而易见。

我的代码是：

_form.html.haml

 = f.collection_select :category, Category.where(:user_id => current_user.id), :id, :name

我得到的是

 ActiveRecord::AssociationTypeMismatch in LinksController#create
 Category(#70203963939880) expected, got String(#70203929255820)

日志

 Started POST "/links" for 127.0.0.1 at 2012-11-12 22:14:05 -0800
 Processing by LinksController#create as HTML
 Parameters: {"utf8"=>"✓", "authenticity_token"=>"z4RYcUW3hGLfKBAwQLMZbye2I1mn16fg6BSBGe7GILU=", "link"=>{"name"=>"SFGate", "url"=>"http://www.sfgate.com/", "category"=>"1"}, "commit"=>"Save"}
 Completed 500 Internal Server Error in 0ms

好像它传递了：id作为字符串而不是整数。有线索吗？

更新

class Category < ActiveRecord::Base
  belongs_to :user
  has_many :links

  attr_accessible :name, :color, :position

  COLOR_CODES = ["Green", "Blue", "Yellow", "Orange", "Red", "Purple", "Pink"]
end

class Link < ActiveRecord::Base
  belongs_to :user
  belongs_to :category

  attr_accessible :category, :name, :position, :url, :user_id
end

修正：我有

 t.integer :category

而不是

 t.integer :category_id

将一切都改变了，它的工作完美 - 我想我太累了。）

Answer 1

你应该改变：

f.collection_select :category, Category.where(:user_id => current_user.id), :id, :name

为：

f.collection_select :category_id, Category.where(:user_id => current_user.id), :id, :name

collection_select给出了ActiveRecord :: AssociationTypeMismatch

1 个答案: