AttributeError with multiple ForeignKeyField to the same table.

Charles,

Here a simple example to reproduce:

from peewee import *

class Parent(Model):
    name = CharField()

class Student(Model):
    name = CharField()
    father = ForeignKeyField(Parent)
    mother = ForeignKeyField(Parent)

AttributeError: Foreign key: student.mother related name "student_set" collision with foreign key using same related_name.

It seems that peewee tries to make a set with all the references to same table, but there is case where the attributes are different.

[coleifer]

This is because there are two foreign keys to the same model on Student. Specify related_name attributes (the backref on Parent):

class Student(Model):
    name = CharField()
    father = ForeignKeyField(Parent, related_name='father_students')
    mother = ForeignKeyField(Parent, related_name='mother_students')

This is a new error that is raised because both parent fks would use the same backref (student_set), which is ambiguous.

[coleifer]

I’ll look into it, but I’m going to go out on a limb and say that pwiz does a pretty damn good job at what it does.