id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
36384	update_dimension_fields blocks getting model instances from the database when the external storage has issues	Gerben Morsink		"It seems when a height_field or width_field are given, the update_dimension_fields is always called on initialization of the model instance. Thereby always doing a call to an external database if those fields are empty.

This might seem obvious, but it means that when and external storage is down, it is not possible anymore to get this Model instance anymore.

For example with S3 issue it might raise:

`ClientError: An error occurred (403) when calling the HeadObject operation: Forbidden`

even when I simply want to get the object without the width and height, like here:

`UserAvatar.objects.get(user=user).only('id')`

This is in my opinion an unexpected consequence of adding the height_field and width_field to an ImageField. 
What do you think, should width and height be lazily loaded somehow? "	Cleanup/optimization	closed	Database layer (models, ORM)	5.1	Normal	worksforme		Gerben Morsink	Unreviewed	0	0	0	0	0	0