maybe something like this...
class Employee(models.Model):
# your employee model fields here, no FKs to Contact or
Assignment models
...
class EmployeeAssignment(models.Model):
active = models.BooleanField() # I added this
employee = models.ForeignKey(Employee)
...
class EmployeeContract(models.Model):
active = models.BooleanField() # I added this
employee = models.ForeignKey(Employee)
...
then you could do
bob = Employee.objects.get(pk=1)
current_contacts = bob.employeecontract_set.filter(active=True)
current_assignments = bob.employeassignment_set.filter(active=True)
I added the active flag to differentiate history vs current
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