Cloning Django objects pattern

clone_objects_example.py

def model_to_dict(instance, exclude: list = None, modify: dict = None):
    excluded_fields = ["id", "pk"]
    if exclude:
        excluded_fields.extend(exclude)

    defaults = dict(
        [
            (fld.name, getattr(instance, fld.name))
            for fld in instance._meta.fields
            if fld.name not in excluded_fields
        ]
    )
    if modify:
        for k, v in modify:
            if v:
                defaults[k] = v
            else:
                del defaults[k]
    return defaults
    
    
    
def clone_mymodel(instance):
  fk1_clone = clone_fk1(instance.fk1)
  fk2_clone = clone_fk2(instance.fk2)
  
  m2m1_clones = []
  for m2m in instance.m2m1.all():
    m2m1_clones.append( clone_m2m1 )
  
  defaults = model_to_dict(instance, exclude=["name", "fk1", "fk2", "m2m1"])
  
  clone, is_new = MyModel.objects.get_or_create(name=f"{instance.name}-clone", defaults=defaults )
  clone.fk1 = fk1_clone
  clone.fk2 = fk2_clone
  clone.save()
  
  for m2m1_clone in m2m1_clones:
      clone.m2m1.add(m2m1_clone)
  
  return clone