[Django]-Django: FileField, missing content_type

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Assuming you have a model as:

class Foo(models.Model):
    myfile = models.FileField(upload_to='files/')
    content_type = models.CharField(null=True, blank=True, max_length=100)

The field myfile is for storing files, and content_type is for storing the content-type of the corresponding file.

You could store the content_type type of a file by overriding the save() method of Foo model.

Django file field provides file.content_type attribute to handle the content_type type of the file. So change your model as:

class Foo(models.Model):
    myfile = models.FileField(upload_to='files/')
    content_type = models.CharField(null=True, blank=True, max_length=100)

    def save(self, *args, **kwargs):
        self.content_type = self.myfile.file.content_type
        super().save(*args, **kwargs)

Now, you could query the ORM by using filter() as:

Foo.objects.filter(content_type='application/pdf')
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