Question

这就是我需要的：

学校有很多老师
教师可以属于一所或多所学校
主题可以属于一个或多个教师
教师可以有很多科目

我如何建立一个存储关系：

老师A在1号学校和2号学校工作，但是他在1号学校教数学和物理，在学校2只学数学？

这就是我已经做过的事情：

class School < ApplicationRecord
    has_many :school_teachers
    has_many :teachers, through: :school_teachers
end

class Teacher < ApplicationRecord
    has_many :school_teachers
    has_many :schools, through: :school_teachers
end

class SchoolTeacher < ApplicationRecord
  belongs_to :school
  belongs_to :teacher
end


class Subject < ApplicationRecord
end

Answer 1

由于受试者与一个或多个学校相关联。老师配对，然后我会建议这可能真的是一个3路＆＃34;已经属于很多＆＃34;关系。

class School < ApplicationRecord
  has_many :school_teacher_subjects
  has_many :teachers, through: :school_teacher_subjects
  has_many :subjects, through: :school_teacher_subjects
end

class Teacher < ApplicationRecord
  has_many :school_teacher_subjects
  has_many :schools, through: :school_teacher_subjects
  has_many :subjects, through: :school_teacher_subjects
end

class Subject < ApplicationRecord
  has_many :school_teacher_subjects
  has_many :schools, through: :school_teacher_subjects
  has_many :teachers, through: :school_teacher_subjects
end

class SchoolTeacherSubject < ApplicationRecord
  belongs_to :school
  belongs_to :teacher
  belongs_to :subject
end

以下是客户，电话和地址的3路HABTM关系示例：Custom db entry for 3 way habtm in ROR 。

建模学校数据库

1 个答案: