[英]How to set has_many association between parent app's model and mounted engine's model?
[英]Model association that spans across parent app and engine
我正在制作一個在控制器中引用current_user
的Rails引擎,如下所示:
require_dependency "lesson_notes/application_controller"
module LessonNotes
class NotesController < ApplicationController
def index
if current_user
@notes = Note.where(student: current_user) if current_user.user_type.name == "student"
@notes = Note.where(teacher: current_user) if current_user.user_type.name == "teacher"
end
end
end
end
這是非常冗長的,似乎我可以做這樣的事情:
require_dependency "lesson_notes/application_controller"
module LessonNotes
class NotesController < ApplicationController
def index
@notes = current_user.notes if current_user
end
end
end
但是, 用戶模型存在於父應用程序中,而不存在於engine中 。
在Note
模型中,我可以用它來定義belongs_to
關聯:
module LessonNotes
class Note < ActiveRecord::Base
belongs_to :student, class_name: "::User"
belongs_to :teacher, class_name: "::User"
end
end
如何在User
模型中定義關聯的另一端has_many
?
這就是我最終這樣做的方式...
在父應用中:
class User < ActiveRecord::Base
has_many :notes, class_name: LessonNotes::Engine::Note, foreign_key: "teacher_id"
end
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