How to use a model source code in different folder than module root? (i.e. inside directory "models")

Question

In a custom module, if you want to define model FOOBAR  you just write the code in foobar.py and include
from . import foobar
in __init__.py
So far, so good.
I want to move my foobar.py to folder models. What shoud be included in __init__.py to reflect the fact that foobar.py is in "models" folder?

Axel Mendoza · Accepted Answer

your models need to be a python package so it needs a __init__.py with the foobar.py import inside, and in the module root you import the models package. this is the structure:
module_root
----models
--------__init__.py               #import foobar
--------foobar.py
----__init__.py                    #import models
----__openerp__.py

Sergio Gonzalez · Answer

This has been working for me in v10 and v11 but now in v12 is not working and i am looking for ideas. Exact same case.

My module files are listed  like folows:
-module folder
-- __init__.py
from . import models
--models
--- __init__.py
from . import myfile
---myfile.py

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