I cannot figure out how to add relation between tables.

class MyModel(BaseModel):     a = peewee.TextField()     b = peewee.TextField()     c = peewee.IntegerField()     d = peewee.TextField()     e = peewee.FloatField()     f = peewee.FloatField()      class Meta:         primary_key = peewee.CompositeKey('a', 'b', 'c', 'd')   class RModel(BaseModel):     """     """     record = peewee.ForeignKeyField(MyModel, related_name='record')     date = peewee.DateTimeField(default=datetime.datetime.now) 

I want to guaranteed that ‘a’, ‘b’, ‘c’, ‘d’ fields in MyModel will creates unique combination. (unique together)

I also would like to add relation to this table to RModel table.

I am still getting

AttributeError: 'CompositeKey' object has no attribute 'get_db_field'