collection_select给ActiveRecord :: AssociationTypeMismatch

问题描述

我不确定我是否正确地提出这个问题，或者说太累了。

我的代码是：

_form.html.haml

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

/ p>

 链接控制器中的ActiveRecord :: AssociationTypeMismatch＃create 
类别（＃70203963939880）expected，got String（＃70203929255820）
  

日志是

 启动POST/ links为127.0.0.1在2012-11-12 22:14:05 -0800 
处理LinksController＃create as HTML 
参数：{utf8=> ✓，authenticity_token=>z4RYcUW3hGLfKBAwQLMZbye2I1mn16fg6BSBGe7GILU =，link=> {name=>SFGate，url=>http://www.sfgate.com/ ，category=>1}，commit=>保存} 
已完成500内部服务器错误：0ms 
  

看起来好像它的传递：id作为字符串而不是整数。任何线索？

更新：

  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 
  

和它的工作完美 - 我想我太累了）。

解决方案

你应该改变：

  f.collection_select：category，Category.where（：user_id => current_user.id），：id，：name 
  
 
 
 
到：
  f.collection_select： category_id，Category.where（：user_id => current_user.id），：id，：name 
  
 
I'm not sure if I'm asking this question right or am just too tired for it to be obvious.
My code is:
_form.html.haml
 = f.collection_select :category, Category.where(:user_id => current_user.id), :id, :name
What I get is 
 ActiveRecord::AssociationTypeMismatch in LinksController#create
 Category(#70203963939880) expected, got String(#70203929255820)
Log is
 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
It appears as though its passing :id as a string instead of an integer.  Any clues?
Update:
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
Fixed:  I had 
 t.integer :category 
instead of 
 t.integer :category_id 
switched everything over and its working perfect - I guess I was too tired :)
 解决方案 
You should change: 
f.collection_select :category, Category.where(:user_id => current_user.id), :id, :name
to:
f.collection_select :category_id, Category.where(:user_id => current_user.id), :id, :name
                        
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