35 lines
1.3 KiB
Python
35 lines
1.3 KiB
Python
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def merge(from_obj, to_obj):
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for related in from_obj._meta.get_all_related_objects():
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accessor_name = related.get_accessor_name()
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varname = related.field.name
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if related.multiple:
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field = getattr(from_obj, accessor_name)
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field.all().update(**{varname: to_obj})
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elif related.one_to_one:
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try:
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field = getattr(from_obj, accessor_name)
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try:
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getattr(to_obj, accessor_name)
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except Exception as e:
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# doesn't exist, safe to overwrite
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setattr(field, varname, to_obj)
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field.save()
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except Exception as e:
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# from_obj one to one isn't set, skip
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pass
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else:
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import pdb; pdb.set_trace()
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raise Exception('unknown code path')
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for related in from_obj._meta.get_all_related_many_to_many_objects():
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accessor_name = related.get_accessor_name()
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if accessor_name:
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varname = related.field.name
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field = getattr(from_obj, accessor_name)
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if related.many_to_many:
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for f in field.all():
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getattr(f, varname).remove(from_obj)
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getattr(f, varname).add(to_obj)
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