Question

class User < ActiveRecord::Base
  has_one :report
  has_many :invoices
end

class Report
  include ActiveModel::Model

  belongs_to :user

  def self.monthly_sales
    user.invoices.group_by { |i| i.date.beginning_of_month }
  end
end

不幸的是，上面的代码无效。我想访问我的报告方法，例如@user.report.monthly_sales。我觉得我很接近它。请告诉我如何关联这两个模型的方式。

Answer 1

而不是关联，你可以这样做：

class User < ActiveRecord::Base
  has_many :invoices

  def report
    @report ||= Report.new(self)
    @report
  end
end

class Report
  include ActiveModel::Model

  def initialize(user)
    @user = user
  end

  def monthly_sales
    user.invoices.group_by { |i| i.date.beginning_of_month }
  end
end

如何关联ActiveRecord模型和普通类模型

1 个答案: