Question

下面的代码在Rails 3中工作正常，但它会引发错误：

ActiveRecord::StatementInvalid: SQLite3::SQLException: ambiguous column name: 
id: SELECT "categories".id FROM "categories" 
INNER JOIN "categorizations" 
ON "categories"."id" = "categorizations"."category_id" 
WHERE "categorizations"."reason_id" = 283 ORDER BY id

问题似乎是对reason.category_ids的调用

- reasons.each do |reason|
  - cat_ids = reason.category_ids.map {|id| "cat_id_#{id}"}.join(" ")
  %li{"data-reason-id" => reason.id, :class => cat_ids}
    %a= reason.text

class Reason < ActiveRecord::Base
  has_many :categorizations
  has_many :categories, :through => :categorizations

更新：在这里注释掉最后一行时，问题就解决了。这是一个错误吗？

class Category < ActiveRecord::Base
  has_many :categorizations
  has_many :reasons, :through => :categorizations

  scope :active, where("active = ?", true)
  default_scope :order => 'id'

Answer 1

Here we go ...

[In Rails 3.1] Supplying options hash to with_scope, with_exclusive_scope and default_scope has also been deprecated:

default_scope :order => "id DESC"

Try：

default_scope order('categories.id')

升级到Rails 3.1时出现模糊列名称错误

1 个答案: