我不确定我问的这个问题是否正确，或者只是太累了，以至于不明显。
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
它似乎将 :id 作为字符串而不是整数传递。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
把所有东西都换过来了，它工作得很完美——我想我太累了:)
最佳答案
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
关于ruby-on-rails - collection_select 给出 ActiveRecord::AssociationTypeMismatch，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13356322/