How to use django.core.files.storage.get_available_name? -

i storing files , need unique file name. found a suggestion use django.core.files.storage.get_available_name missing something. tried this:

class mymodel(models.model):     name         = models.charfield( max_length=200, null=true )      filecontent  = models.filefield( null=true, upload_to=storage.get_available_name(name) ) 

and got error: typeerror: unbound method get_available_name() must called storage instance first argument (got charfield instance instead) interpret meaning trying run method on class need storage-instance run on. there exist called defaultstorage supposed something "provides lazy access current default storage system" 1 not have get_available_name method method _setup can't called on class either. how supposed instance work on here?

the upload_to argument directory path want upload files to. argument storage named storage

so should if want change default django's storage implementation use example

    filecontent = models.filefield(null=true, upload_to='path/to/dir', storage=filesystemstorage()) 

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if need implement own way play filenames have create class inherits storage , overwrite it's get_available_name method. example:

    class myownstorage(filesystemstorage):         def get_available_name(self, name):             if self.exists(name):                 #return             else:                 #return something_else 

and use follows:

    filecontent = models.filefield(null=true, upload_to='path/to/dir', storage=myownstorage())