我正在努力解决对象中的错误,但完全不确定问题出在哪里。
这是模型的样子:
class Car < ActiveRecord::Base
has_many :car_colors
has_many :colors, :through => :car_colors
end
class CarColor < ActiveRecord::Base
belongs_to :color
belongs_to :car
end
class Color < ActiveRecord::Base
has_many :car_colors
has_many :cars, :through => :car_colors
end
这里是查询:
@cars = Car.all(:joins => :car_colors, :conditions => { :car_colors => {:color_id => params[:id_number]}}, :order => "cars.created_at DESC")
错误输出:
PG::Error: ERROR: column reference "created_at" is ambiguous
LINE 1: ...d" WHERE "car_colors"."color_id" = 2 AND (created_at...
^
: SELECT "cars".* FROM "cars" INNER JOIN "car_colors" ON "car_colors"."car_id" = "cars"."id" WHERE "car_colors"."color_id" = 2 AND (created_at > '2013-05-03 12:28:36.551058') ORDER BY cars.created_at DESC
生成的 SQL 查询(在错误消息下方)似乎没有问题,但是是什么导致了错误消息?
提前谢谢你。
最佳答案
car_colors
表中可能有一个 created_at 字段。 created_at
可能应该是 cars.created_at
以消除歧义。
关于ruby-on-rails - Rails ActiveRecord:PG::错误:错误:列引用 "created_at"不明确,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16896937/