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26 lines
1013 B
Python
26 lines
1013 B
Python
from django.forms.models import ModelFormMetaclass, BaseModelForm
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from django.utils import six
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from versions.models import Versionable
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class VersionedBaseModelForm(BaseModelForm):
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"""
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This is a helperclass to construct VersionedModelForm
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"""
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def save(self, commit=True):
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if self.instance.pk is not None and isinstance(self.instance, Versionable):
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if self.has_changed():
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self.instance = self.instance.clone()
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return super().save(commit)
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class VersionedModelForm(six.with_metaclass(ModelFormMetaclass, VersionedBaseModelForm)):
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"""
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This is a modified version of Django's ModelForm which differs from ModelForm in
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only one way: It executes the .clone() method of an object before saving it back to
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the database, if the model is a sub-class of versions.models.Versionable. You can
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safely use this as a base class for all your model forms, it will work out correctly
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with both versioned and non-versioned models.
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"""
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pass
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