2017-06-25 12:17:22 +02:00
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from typing import Union
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from django.db import models
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2017-06-21 14:19:13 +02:00
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def is_created_pk(pk):
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return isinstance(pk, str) and pk.startswith('c') and pk[1:].isnumeric()
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2017-06-25 12:17:22 +02:00
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def get_current_obj(model, pk, only_field=None):
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if is_created_pk(pk):
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return model()
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if only_field is not None:
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return model.objects.only(only_field).get(pk=pk)
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return model.objects.get(pk=pk)
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def get_field_value(obj, field: Union[str, models.Field]):
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if isinstance(field, str):
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name = field
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model = type(obj)
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field = model._meta.get_field('titles' if name.startswith('title_') else name)
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else:
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name = field.name
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try:
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current_value = getattr(obj, field.attname)
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except AttributeError:
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current_value = field.to_prep_value(getattr(obj, field.name))
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if name.startswith('title_'):
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current_value = current_value.get(name[6:], '')
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return current_value
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