Django: ImageField, MEDIA_ROOT, MEDIA_URL, how to install correctly

Question

How should MEDIA_ROOT and MEDIA_URL be set correctly in the context of ImageField ? How to set upload_to parameter for ImageField? The comments for MEDIA_ROOT and MEDIA_URL insufficient, so I would like to know what they are used for and how to install them correctly.

Answer 1

MEDIA_ROOT is the directory where you want the files to go, MEDIA_URL should be a URL that leads to the same directory path.

The upload_to parameter can either be a directory in this directory, so upload_to = "foo" will be in the "foo" subdirectory of MEDIA_ROOT.

Or it could be a function that takes an instance of the image field and the proposed base file name and returns the real file name that you want to use. So,

 upload_to=get_photo_path 

and

 def get_photo_path(instance, filename): if not filename: return "" exts = re.search('[.]([^.]*)$',filename) if exts is None: ext = '' else: ext = '.'+exts.group(1) return "newname%s" % (ext) 

Rename the file, but save it. Please note that the "new name". it will still be in the MEDIA_ROOT directory - you do not need to return / usr / whatever / something / foo / newname. ". It already broadcasts MEDIA_ROOT for you.

Update:

FYI, nice to know about

 <modelobject>.<imagefieldname>.field.generate_filename( <modelobject>, proposed_name ) 

Here's how you can create a partial path that the image will follow from outside the model. You need to manually add MEDIA_ROOT to this to make it an absolute path.