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64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
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 extras.constants import EXTRAS_FEATURES
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from extras.registry import registry
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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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return False
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def image_upload(instance, filename):
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"""
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Return a path for uploading image attchments.
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"""
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path = 'image-attachments/'
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# Rename the file to the provided name, if any. Attempt to preserve the file extension.
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extension = filename.rsplit('.')[-1].lower()
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if instance.name and extension in ['bmp', 'gif', 'jpeg', 'jpg', 'png']:
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filename = '.'.join([instance.name, extension])
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elif instance.name:
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filename = instance.name
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return '{}{}_{}_{}'.format(path, instance.content_type.name, instance.object_id, filename)
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@deconstructible
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class FeatureQuery:
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"""
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Helper class that delays evaluation of the registry contents for the functionality 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_query()
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def get_query(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_features'][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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def register_features(model, features):
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for feature in features:
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if feature not in EXTRAS_FEATURES:
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raise ValueError(f"{feature} is not a valid extras feature!")
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app_label, model_name = model._meta.label_lower.split('.')
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registry['model_features'][feature][app_label].add(model_name)
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