mysql - How can I write this statement so it stays as an ActiveRecord call?

Question

I'm trying to make a query that, I believe, is a double joins call.

@customer.jobs.joins(:assignments).where('assignments.employee_id' => current_user.id).collect{|j|j.payments}.flatten

I'm looking for payments, only if they've been assigned to my current_user under my customer record.

Payments are connected to customers through a joins table ( payment_applications ). Employees are assigned to Jobs through a join table ( assignments ).

The query above returns the right objects, but its an array so I can't assign them to pagination. How can I keep that query an ActiveRecord call?

Answer 1

如果您想以付款结束，我建议您从那里开始查询：

@payments = Payment.for_customer(customer)

在你的模型中：

class Payment < ActiveRecord::Base
  def self.for_user(user)
    joins(:assignments).where('assignments.employee_id' => user.id)
  end
end

如果您想加入客户记录，请更改为

joins(:assignments => :customers)