patch: exclude apps from dumpdir

[Carl Karsten <carl@…>]

To help deal with loaddata issues caused by a single app (like ​http://code.djangoproject.com/ticket/7052 ) this adds support for --exclude to dumpdata. (use multiple --exclude to exclude multiple apps.)

It also adds --verbosity which shows lets you see what apps have been excluded, what will be processed, and what is being processed as the data is being dumped. It sends this to stderr because dumpdata currently sends to stdout.

If stderr is poor form, I was considering adding a --file option so that sdtout could be used for verbosity messages. but that seemed just as wrong as stderr, and stderr was much easier to code.

[Ludvig Ericson]

There are unnecessary changes in the patch. Please have them removed.

     option_list = BaseCommand.option_list + (
-        make_option('--format', default='json', dest='format',
+        make_option('--format', dest='format', default='json',
             help='Specifies the output serialization format for fixtures.'),
-        make_option('--indent', default=None, dest='indent', type='int',
+        make_option('--indent', dest='indent', type='int', default=None,
             help='Specifies the indent level to use when pretty-printing output'),

Also, the direct usage of stderr is layer violation, AFAICT.

[Carl Karsten <carl@…>]

removed unnecessary changes, s/print stderr/sys.stderr.write

[Carl Karsten <carl@…>]

Russ - you kinda mentored me on this - mind chiming in?

[Russell Keith-Magee]

This is a reasonable idea, especially as a workaround for #7052 issues. I can't review the patch right now, but I should have a chance in the near future.

[Russell Keith-Magee]

(In [7615]) Fixed #7254 -- Added an '--exclude' option to dumpdata, allowing specific applications to be removed from the dump output. Thanks to Carl Karsten for the idea and patch.

[Carl Karsten <carl@…>]

What happened to

make_option('-v', '--verbosity', action='store', dest='verbosity', default='0',

?

[Russell Keith-Magee]

On looking at the patch, I couldn't see the value in the output being provided by verbosity - it was useful output for debugging the command itself, but I didn't see the value for end users.