mirror of
https://github.com/Hopiu/django-imagekit.git
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49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
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from django.db.models.signals import post_init, post_save, post_delete
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from ..utils import ik_model_receiver
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def update_source_hashes(instance):
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"""
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Stores hashes of the source image files so that they can be compared
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later to see whether the source image has changed (and therefore whether
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the spec file needs to be regenerated).
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"""
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instance._ik._source_hashes = dict((f.attname, hash(f.source_file)) \
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for f in instance._ik.spec_files)
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return instance._ik._source_hashes
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@ik_model_receiver
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def post_save_receiver(sender, instance=None, created=False, raw=False, **kwargs):
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if not raw:
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old_hashes = instance._ik._source_hashes.copy()
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new_hashes = update_source_hashes(instance)
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for attname in instance._ik.spec_fields:
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if old_hashes[attname] != new_hashes[attname]:
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getattr(instance, attname).invalidate()
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@ik_model_receiver
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def post_delete_receiver(sender, instance=None, **kwargs):
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for spec_file in instance._ik.spec_files:
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spec_file.clear()
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@ik_model_receiver
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def post_init_receiver(sender, instance, **kwargs):
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update_source_hashes(instance)
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def configure_receivers():
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# Connect the signals. We have to listen to every model (not just those
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# with IK fields) and filter in our receivers because of a Django issue with
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# abstract base models.
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# Related:
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# https://github.com/jdriscoll/django-imagekit/issues/126
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# https://code.djangoproject.com/ticket/9318
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uid = 'ik_spec_field_receivers'
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post_init.connect(post_init_receiver, dispatch_uid=uid)
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post_save.connect(post_save_receiver, dispatch_uid=uid)
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post_delete.connect(post_delete_receiver, dispatch_uid=uid)
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