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84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
import collections
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from django.db.models import Q
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from django.utils.deconstruct import deconstructible
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from taggit.managers import _TaggableManager
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from utilities.querysets import DummyQuerySet
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from extras.constants import EXTRAS_FEATURES
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def is_taggable(obj):
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"""
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Return True if the instance can have Tags assigned to it; False otherwise.
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"""
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if hasattr(obj, 'tags'):
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if issubclass(obj.tags.__class__, _TaggableManager):
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return True
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# TaggableManager has been replaced with a DummyQuerySet prior to object deletion
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if isinstance(obj.tags, DummyQuerySet):
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return True
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return False
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#
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# Dynamic feature registration
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#
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class Registry:
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"""
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The registry is a place to hook into for data storage across components
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"""
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def add_store(self, store_name, initial_value=None):
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"""
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Given the name of some new data parameter and an optional initial value, setup the registry store
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"""
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if not hasattr(Registry, store_name):
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setattr(Registry, store_name, initial_value)
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registry = Registry()
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@deconstructible
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class FeatureQuerySet:
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"""
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Helper class that delays evaluation of the registry contents for the functionaility store
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until it has been populated.
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"""
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def __init__(self, feature):
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self.feature = feature
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def __call__(self):
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return self.get_queryset()
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def get_queryset(self):
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"""
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Given an extras feature, return a Q object for content type lookup
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"""
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query = Q()
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for app_label, models in registry.model_feature_store[self.feature].items():
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query |= Q(app_label=app_label, model__in=models)
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return query
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registry.add_store('model_feature_store', {f: collections.defaultdict(list) for f in EXTRAS_FEATURES})
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def extras_features(*features):
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"""
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Decorator used to register extras provided features to a model
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"""
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def wrapper(model_class):
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for feature in features:
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if feature in EXTRAS_FEATURES:
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app_label, model_name = model_class._meta.label_lower.split('.')
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registry.model_feature_store[feature][app_label].append(model_name)
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else:
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raise ValueError('{} is not a valid extras feature!'.format(feature))
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return model_class
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return wrapper
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