Django FileField在上传后移动文件 [英] Django FileField move file following upload

问题描述

围绕该主题有几个问题，但我发现没有一个适合我的尝试。我希望能够将文件上传到模型，并使用模型实例属性（例如pk）将该文件保存在一个不错的位置。我知道这些东西是在 model.save（）之后设置的，因此我需要编写一个自定义保存来执行此操作，但我无法弄清楚。这是我的东西：

There are several questions around this topic but not one that I've found that suits what I'm trying to do. I want to be able to upload a file to a model and save that file in a nice location using the model instance attributes like pk. I know that this stuff gets set after model.save() so I need to write a custom save to do this, but I can't figure it out. Here is what I have:

class UploadModel(models.Model):
    image = models.ImageField(upload_to='uploads')

    def save(self, *args, **kwargs):

        # Call standard save
        super(UploadModel, self).save(*args, **kwargs)

        if 'uploads' in self.image.path:

            initial_path = self.image.path

            # New path in the form eg '/images/uploadmodel/1/image.jpg'
            new_path = os.path.join(settings.MEDIA_ROOT, 'images', 
                self._meta.model_name, self.pk, os.path.basename(initial_path))

            # Create dir if necessary and move file
            if not os.path.exists(os.path.dirname(new_path)):
                makedirs(os.path.dirname(new_path))

            os.rename(initial_path, new_path)

            # Do something here to save the new file to the image field

            # Save changes
            super(UploadModel, self).save(*args, **kwargs)

我有什么对 image 字段进行操作以使其引用此新文件位置，并为其设置所有有用的属性，例如 image.path ， image.name ， image.url 等？

What do I have to do to the image field to get it to reference this new file location, and set all the useful attributes to it like image.path, image.name, image.url etc?

文档说上述就是我所要做的，但这只会导致 image 字段指向一个不存在的文件。我查看了与此相关的问题，并尝试了片段，但我还没有找到解决方案。

The docs say that the above is all I should need to do but this just results in the image field pointing to a file that doesn't exist. I've looked at this related question and tried the snippet mentioned in one of the answers but I have not found a solution yet.

推荐答案

我经过大量搜索和发现此旧文档票证有很好的解释。

I figured it out after a lot of searching and finding this old documentation ticket that has a good explanation.

class UploadModel(models.Model):
    image = models.ImageField(upload_to='uploads')

    def save(self, *args, **kwargs):

        # Call standard save
        super(UploadModel, self).save(*args, **kwargs)

        if 'uploads' in self.image.path:

            initial_path = self.image.path

            # New path in the form eg '/images/uploadmodel/1/image.jpg'
            new_name = '/'.join(['images', self._meta.model_name, str(self.id), 
                path.basename(initial_path)])
            new_path = os.path.join(settings.MEDIA_ROOT, 'images', 
            self._meta.model_name, self.pk, os.path.basename(initial_path))

            # Create dir if necessary and move file
            if not os.path.exists(os.path.dirname(new_path)):
                makedirs(os.path.dirname(new_path))

            os.rename(initial_path, new_path)

            # Update the image_file field
            self.image_file.name = new_name

            # Save changes
            super(UploadModel, self).save(*args, **kwargs)

现在我读了<一个href = https://docs.djangoproject.com/zh-CN/1.8/topics/files/#using-files-in-models rel = nofollow>为此的文档，它看起来很明显：)但我确实认为可以使说明更具描述性。希望这可以节省一些时间！

Now I read the docs for this it looks totally obvious :) but I do think the explanation could be made more descriptive. Hopefully this will save someone some time!

这篇关于Django FileField在上传后移动文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！