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
27666	Delay rendering of models in migration operations when possible	Markus Holtermann	Markus Holtermann	"As it turns out, when we delay the rendering of related models up to the point where it's necessary (just before RunPython, afaict), we can cut down migration time to a quarter and maybe more: https://github.com/MarkusH/django/commit/6b8280e0582d778944585e966404252c4994185e#commitcomment-19719252

PR: https://github.com/django/django/pull/7589

Given that 3rd party migration operations may need to enforce model rendering like we do for RunPython, we probably need to treat this as a backwards incompatible change, I suppose.

{{{#!python
    def database_forwards(self, app_label, schema_editor, from_state, to_state):
        if from_state.is_delayed and 'apps' in from_state.__dict__:
            del from_state.__dict__['apps']
        # ...
}}}"	Cleanup/optimization	closed	Migrations	dev	Normal	fixed			Accepted	1	0	0	0	0	0