Before this commit:
* Module A defines a field X of model M
* Module B inherits from model M without touching field X
* Module C inherits from model M and extends field X by giving an INDEX
/ NOT NULL constraint.
* Module B and C depend from Module A, but not each other
If all three modules are installed and Module B is updated, the INDEX /
NOT NULL constraint could be dropped.
This happens because Module B can be loaded before Module C is loaded,
if that's the case, then after the upgrade of Module B, during the
schema checking, we verify that the field object we have and the field
on the DB are the same, since Module B doesn't introduce the index then
this check is false and we drop the index. When we get to loading Module
C, we do not do any schema checking because the module is not marked as
`to upgrade`, therefore the index is lost forever.
To solve this, we re-init the models that belong to the set of the intersection
between upgraded and modified models and loaded and modified models.
Fixes#24958
Adrian Torres
a5ccc1b6b5