django-processedfilefield 0.2

django-processedfilefield: Django FileFields的后处理。接受一个映射到后处理函数的模型字段名称字典。这些函数可以将PDF转换为文本，缩略图图像等。

示例

>>> class TestModel(models.Model):
...     content = ProcessedFileField(upload_to='content', variations=dict(
...         content_first_10_bytes=lambda file: file.read()[:10]
...     ))
...     content_first_10_bytes = models.FileField(upload_to='content_first_10_bytes')
...
>>> obj = TestModel.objects.create()
>>> obj.content = ContentFile('abcdefghijklmnopqrstuvwxyz')
>>> obj.content.name = 'alphabet'
>>> obj.save()
>>>
>>> assert obj.content_first_10_bytes.read() == 'abcdefghij'