在 Grails 中保存具有表关联的数据

Question

I have two database tables 'Student' and 'Course'. I want a one-to-one relation where there is foreign key of 'Course' table in 'Student' table. The foreign key 'course_id' is appearing in the Student table but whenever I try to save the Student data (after filling form), the data does not get saved and there is no error as well. I am very new to grails. Please guide me how I can save the data correctly.

The table structure is as desired but the data is not getting saved to the database. There is no issue with other code parts because the data is getting saved when I remove the association between the two tables.

Student controller

package com.grails

class studentController {
    def save(Student student){
        student.save()
    }
}

Student domain class

class Student {
    Course course

    String firstName
    String lastName
}

Course domain class

class Course{
    String course_name
    String duration

    static hasOne = [student: Student]

    //static belongsTo = [student: Student]
}

Answer 1

Note that grails 4 introduced a bug with one-to-one relationships that gives inconsistent behavior based on the owning side of the relationship: https://github.com/grails/grails-core/issues/11606

I'm not sure if this is the same problem you may be seeing without more information on your error, or even if you're on this version of grails.