Django动态模型。FileField存储 [英] Django dynamic models.FileField Storage

问题描述

我有一个这样的模型：

class Person(models.Model):
    name = models.Charfield(max_length¶=30)
    photo = models.FileField(upload_to='uploads/')

是否有任何方法可以根据<$ c的值动态更改照片字段的 Storage 类c $ c> name 字段？

Is there any way to dynamically change the Storage class of photo field based on the value of the name field?

例如，我要存储名称为的人的照片xxx 到FileSystemStorage¶，对于其他我想使用 S3Storage

for example, I want to store the photo of the persons with the name xxx to FileSystemStorage¶ and for the others I want to use S3Storage

推荐答案

我也有一个类似的用例。使用模型字段 object_storage_name 动态更新存储。
通过从文章 https://medium.com/@hiteshgarg14/how-to-dynamic-selectly-storage-in-django-filefield-bc2e8f5883fd

I also had a similar use case. Update storage dynamically using the model field object_storage_name. Tried this below code by taking inspiration from the article https://medium.com/@hiteshgarg14/how-to-dynamically-select-storage-in-django-filefield-bc2e8f5883fd

class MediaDocument(models.Model):
    object_storage_name = models.CharField(max_length=255, null=True)
    file = DynamicStorageFileField(upload_to=mediadocument_directory_path)


class DynamicStorageFieldFile(FieldFile):

    def __init__(self, instance, field, name):
        super(DynamicStorageFieldFile, self).__init__(
            instance, field, name
        )
        if instance.object_storage_name == "alibaba OSS":
            self.storage = AlibabaStorage()
        else:
            self.storage = MediaStorage()


class DynamicStorageFileField(models.FileField):
    attr_class = DynamicStorageFieldFile

    def pre_save(self, model_instance, add):
        if model_instance.object_storage_name == "alibaba OSS":
            storage = AlibabaStorage()
        else:
            storage = MediaStorage()
        self.storage = storage
        model_instance.file.storage = storage
        file = super(DynamicStorageFileField, self
                     ).pre_save(model_instance, add)
        return file

效果很好。

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