36 lines
876 B
Python
36 lines
876 B
Python
from .models import SortableMixin, SortableForeignKey
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def check_inheritance(obj):
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return issubclass(type(obj), SortableMixin)
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def get_is_sortable(objects):
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if objects.count() < 2:
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return False
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if not check_inheritance(objects[:1][0]):
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return False
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return True
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def is_self_referential(cls):
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cls_type = type(cls)
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sortable_subclass = check_inheritance(cls_type)
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sortable_foreign_key_subclass = issubclass(cls_type, SortableForeignKey)
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if sortable_foreign_key_subclass and not sortable_subclass:
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return True
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return False
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def check_model_is_sortable(cls):
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if cls:
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if check_inheritance(cls):
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if is_self_referential(cls):
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objects = cls.model.objects
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else:
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objects = cls.objects
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return get_is_sortable(objects.all())
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return False
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