Ruby on rails 二者通过同一模型有许多关系

我面临一个问题，我不知道如何解决它

我有三种型号

• 老师
• 房间
• 小时数

我需要通过同一个模型将它们关联起来。到现在为止，我有一个第四个模型叫做schedules，我有两个外键。教师id和小时id，这是完美的工作，但我还需要通过这个模型关联房间

这是我的密码：

teacher.rb

class Teacher < ApplicationRecord
  scope :active, -> {where(deleted_at: nil)}
  has_many :schedules, dependent: :destroy
  has_many :lesson_hours, through: :schedules
  has_many :teacher_courses, dependent: :destroy
  has_many :courses, through: :teacher_courses
  has_many :registrations

  def check_associations
    errors.add(:base, "Há matrículas cadastradas com esse professor. Por favor ajuste antes de deletar.") if self.registrations.active.count > 0
    return errors.blank?
  end

  def delete!
    if check_associations
      self.deleted_at = Time.current
      save!
      return true
    else
      return false
    end
  end
end

class Room < ApplicationRecord
  scope :active, -> {where(deleted_at: nil)}
  has_many :room_courses, dependent: :destroy
  has_many :courses, through: :room_courses
  has_many :registrations

  def check_associations
    errors.add(:base, "Há matrículas cadastradas com essa sala. Por favor ajuste antes de deletar.") if self.registrations.active.count > 0
    return errors.blank?
  end

  def delete!
    if check_associations
      self.deleted_at = Time.current
      save!
      return true
    else
      return false
    end
  end
end

class LessonHour < ApplicationRecord
  scope :active, -> {where(deleted_at: nil)}
  has_many :schedules, dependent: :destroy
  has_many :teachers, through: :schedules
  has_many :registrations

  def check_associations
    errors.add(:base, "Há matrículas cadastradas nesse horário. Por favor ajuste antes de deletar.") if self.registrations.active.count > 0
    return errors.blank?
  end

  def delete!
    if check_associations
      self.deleted_at = Time.current
      save!
      return true
    else
      return false
    end
  end
end

class Schedule < ApplicationRecord
  belongs_to :teacher
  belongs_to :lesson_hour
end

def set_lesson_days_and_hours
    @lesson_days = LessonHour.select(:weekday)
                             .group(:weekday)
                             .order(:weekday)
                             .to_a
    @lesson_hours = {}
    @lesson_days.each do |ld|
      @lesson_hours[ld.weekday] = LessonHour.active
                                            .select(:id, :start_time)
                                            .order(:start_time)
                                            .where(weekday: ld.weekday)
    end
  end

  def teacher_params
    params
      .require(:teacher)
      .permit(:name, :address, :address_number, :address_complement,
              :address_cep, :address_neighborhood, :city, :state, :birthdate,
              :email, :cpf, :rg, :phone, :mobile, :started_date, :bank, :agency,
              :account_number, :gender, lesson_hour_ids: [], course_ids: [])
  end

将课时与教师链接的表格如下：

<div class="row teacher-schedule">
    <h4>Disponibilidade</h4>

    <% @lesson_days.each do |ld| %>
    <div class="col-md-2 one-per-line teacher-schedule">
      <span><strong><%= t(:"date.day_names")[ld.weekday] %></strong></span>
      <%= f.collection_check_boxes(:lesson_hour_ids, @lesson_hours[ld.weekday], :id, :start_time) do |check_box| %>
      <%= check_box.label class:"label-checkbox" do %>
      <%= check_box.check_box + check_box.text.strftime("%H:%M") %>
      <% end %>
      <% end %>
    </div>
    <% end %>
  </div>

有争议的

所以，我的问题是，如何在日程模型中包含房间关联

---

提前感谢

当您需要添加两个has\u many时，您需要指定外键和类名，以便rails可以进行连接

例如：

class TwoHasMany < ApplicationRecord
  has_many :scheduled_teachers, foreign_key: :teacher_id, class_name: 'Schedule'
  has_many :teachers, through: :scheduled_teachers

  has_many :scheduled_lessons, foreign_key: :lesson_hour_id, class_name: 'Schedule'
  has_many :lesson_hours, through: :scheduled_lessons
end

class two有许多

当需要添加两个has\u many时，需要指定外键和类名，以便rails可以进行连接

例如：

class TwoHasMany < ApplicationRecord
  has_many :scheduled_teachers, foreign_key: :teacher_id, class_name: 'Schedule'
  has_many :teachers, through: :scheduled_teachers

  has_many :scheduled_lessons, foreign_key: :lesson_hour_id, class_name: 'Schedule'
  has_many :lesson_hours, through: :scheduled_lessons
end

class two有许多

很好，谢谢Andre。但在我看来，我该如何管理它呢。我的观点是一个新老师的表单，我需要在同一表单中添加教室和课时。到现在为止，我只有上课时了。很好，谢谢你，安德烈。但在我看来，我该如何管理它呢。我的观点是一个新老师的表单，我需要在同一表单中添加教室和课时。到现在为止，我只有上课时了。