simple_form 关联不与属性一起保存

Question

我有三种型号，汽车、服务和预约。

class Car < ApplicationRecord
  belongs_to :user
  has_many :appointments, dependent: :destroy
end

class Service < ApplicationRecord
  has_many :appointments
end

class Appointment < ApplicationRecord
  belongs_to :car
  belongs_to :service
  accepts_nested_attributes_for :service
end

我使用简单的表单来创建引用服务的汽车预约

<%= simple_form_for [@car, @appointment] do |a| %>
<%= a.input :date %>
<%= a.input :description, label: "descripción" %>
<%= a.input :location, label: "ubicación" %>
<%= a.association :service, as: :check_boxes, include_blank: false %>

<%= a.button :submit  %>
  <% end %>`

我的约会使用正确的服务保存，但服务的属性没有

@car = Car.find(params[:car_id])
@appointment = Appointment.new(appointment_params)
@service = Service.new(params[ :service])

@appointment.service = @service
@appointment.car = @car

def appointment_params
  params.require(:appointment).permit(:date, :description, :location, :status, :requests, service_attributes:[:request, :price, :provider])
end

我认为问题出在参数上，但我不确定，我不知道我是否正确保存它们，service_attributes:[:request, :price, :provider]。

提前致谢！ （我使用 Rails 5）

Answer 1

我认为您可能会错误地处理此问题。由于 Service has_many :appointments 和 Appointment has_many :services（基于 cmets），您有一个 m:m 关联，您可以考虑使用 has_many :through。比如：

class Car < ApplicationRecord
  belongs_to :user
  has_many :appointments, dependent: :destroy
end

class AppointmentService < ApplicationRecord
  belongs_to :service
  belongs_to :appointment
end

class Service < ApplicationRecord
  has_many :appointment_services
  has_many :appointments, through: :appointment_services
end

class Appointment < ApplicationRecord
  belongs_to :car
  has_many :appointment_services
  has_many :services, through: :appointment_services
end

现在，您应该可以使用这些参数做一些事情了：

"service_id"=>["", "2", "3"]

创建appointment_services（好像你想放弃那个""）。你需要稍微摆弄一下，也许可以在Appointment 上使用accepts_nested_attributes_for :appointment_service。