Copy Model Object From a Model To Another In Django

Question

I have to model. I want to copy model object from a model to another: Model2 is copy of Model1 (this models has too many m2m fields) Model1:

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Answer 1

Here's the function I've been using, it builds on model_to_dict. Model_to_dict just returns the ids of foreign keys + not their instances, so for those I replace them with the model itself.

def update_model(src, dest):
    """
    Update one model with the content of another.

    When it comes to Foreign Keys, they need to be
    encoded using models and not the IDs as
    returned from model_to_dict.

    :param src: Source model instance.
    :param dest: Destination model instance.
    """
    src_dict = model_to_dict(src, exclude="id")
    for k, v in src_dict.iteritems():
        if isinstance(v, long):
            m = getattr(src, k, None)
            if isinstance(m, models.Model):
                setattr(dest, k, m)
                continue

        setattr(dest, k, v)