django中的下拉列表显示外键字段的对象

Question

I am using models to auto generate a form in Django. Here is my code

class Dependent(models.Model):
    primarystudentid = models.ForeignKey('Students', models.DO_NOTHING, db_column='PrimaryStudentID')  # Field name made lowercase.
    dependentname = models.CharField(db_column='DependentName', max_length=100)  # Field name made lowercase.
    relation = models.CharField(db_column='Relation', max_length=50)  # Field name made lowercase.
    def __str__(self):
        return "{0}".format(self.primarystudentid)

primarystudentid is an auto generated field in Students table. I have tried unicode and str. But i am still getting the value of primarystudentid in dropdown as Students object. I tried a lot of things from stack overflow and other sites but it doesn't seem to be working. Python version Python 2.7.13 Django version 1.9.13 Any help is appreciated!

Answer 1

you need to reference the field in the other table.

dep = Dependent.objects.first()
dep.primarystudentid.name # This would be the name

in your str example

def __str__(self):
    return "{0}".format(self.primarystudentid.name)

just worth noting that this can easily cause a lot of extra queries to be generated.

Answer 2

You need to update the str or unicode method of your Student table (not the Dependent table), and return name or whatever field you want to show in the dropdown.

Example:

class Student(models.Model):
    name = models.CharField(max_length=50)

def __str__(self):
    return u'{0}'.format(self.name)

PS: Please update the name of field dependentname to just name , because it is quite obvious that if this is in the Dependent model then it's the name of dependent.