3つの外部キーとプライベート属性を持つテーブルを後継に作成

Question

3つの外部キーと個人属性を持たないリレーションシップテーブルを作成する最適な方法は何ですか。 私はsubjectが含まれている関係テーブルteacher_subject_allocationを作成したい、teacherとsection

subject.belongsToMany(teacher, {through: 'teacher_subject_allocation'})

teacher.belongsToMany(section, {through: 'teacher_subject_allocation'}) 

Answer 1

//main tables 
//(foreignKey contains field name in association table) 
subject.hasOne(teacher_subject_allocation , { foreignKey: 'subject_id' }); 
teacher.hasOne(teacher_subject_allocation , { foreignKey: 'teacher_id' }); 
section.hasOne(teacher_subject_allocation , { foreignKey: 'section_id' }); 

//association table 
//(targetKey is PK of main table, foreignKey is field of current table) 
teacher_subject_allocation.belongsTo(subject, { targetKey: 'id', foreignKey: 'subject_id' }); 
teacher_subject_allocation.belongsTo(teacher, { targetKey: 'id', foreignKey: 'teacher_id' }); 
teacher_subject_allocation.belongsTo(section, { targetKey: 'id', foreignKey: 'section_id' });