[IMP] mail: make res_model of followers model a related on m2o towards ir.model

When uninstalling a module followers stay in the database because there is no
real link between ir.model and followers. Adding a m2o ensure followers are
correctly removed when uninstalling a module.

res_model fields is kept as a stored related field. This allows to keep
compatibility with almost all code using / searching on followers. Only
followers creation is changed a bit. As follower creation is done mainly
through a dedicated method few changes are required. Yey. Mat should be
happier now.

fix test

0 files changed, 0 insertions, 0 deletions