collection_select给出了ActiveRecord :: AssociationTypeMismatch

我不确定我是否正确地提出这个问题，或者我太累了，因为它显而易见。

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) 

记录是

  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 

它似乎传递：id作为字符串而不是整数。 有什么线索吗？

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 

代替

  t.integer :category_id 

切换一切，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 

至：

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