Rails 4跨模型命名范围

Question

What I want to do is create appropriate named scopes to get all reports of a logged in user that were created 3 days ago

class User < ActiveRecord::Base
    has_many :appraisals

end

class Appraisal < ActiveRecord::Base
    belongs_to :user
    has_one :report

    scope :submitted, -> { joins(:report).where("reports.created_at >= ?", 3.days.ago) }
end

class Report < ActiveRecord::Base
    belongs_to :appraisal
end

I've tried different rails console statements but perhaps I'm going about it the wrong way.

In the rails console I've tried various things but I keep getting this error

PG::UndefinedTable: ERROR: missing FROM-clause entry for table "report"

with statements such as

user = User.find(2)
user.appraisals.submitted

Any ideas?

Answer 1

在joins您必须指定关联名称，如下所示：

scope :submitted, -> { joins(:report).where("appraisal_reports.created_at >= ?", 3.days.ago) }