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https://github.com/Hopiu/django-imagekit.git
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7bc82d3624
Previously, we had two places where we were passing kwargs that affected the image generation: the ImageSpec constructor and the generate method. These were essentially partial applications. With this commit, there's only one partial application (when the spec is instantiated), and the generate method is called without arguments. Therefore, specs can now be treated as generic generators whose constructors just happen to accept a source_file.
38 lines
1.6 KiB
Python
38 lines
1.6 KiB
Python
from ...files import GeneratedImageCacheFile
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from django.db.models.fields.files import ImageField
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class ImageSpecFileDescriptor(object):
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def __init__(self, field, attname):
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self.attname = attname
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self.field = field
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def __get__(self, instance, owner):
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if instance is None:
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return self.field
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else:
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field_name = getattr(self.field, 'source', None)
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if field_name:
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source_file = getattr(instance, field_name)
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else:
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image_fields = [getattr(instance, f.attname) for f in
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instance.__class__._meta.fields if
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isinstance(f, ImageField)]
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if len(image_fields) == 0:
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raise Exception('%s does not define any ImageFields, so your'
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' %s ImageSpecField has no image to act on.' %
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(instance.__class__.__name__, self.attname))
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elif len(image_fields) > 1:
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raise Exception('%s defines multiple ImageFields, but you'
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' have not specified a source for your %s'
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' ImageSpecField.' % (instance.__class__.__name__,
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self.attname))
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else:
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source_file = image_fields[0]
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spec = self.field.get_spec(source_file=source_file) # TODO: What "hints" should we pass here?
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file = GeneratedImageCacheFile(spec)
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instance.__dict__[self.attname] = file
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return file
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def __set__(self, instance, value):
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instance.__dict__[self.attname] = value
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