Update database stored procedures while upgrading a module - Odoo - postgresql

Question

There is an option in the menifest file to call method during module installation. We can mention pre_init and post_init.
I would like to call one method while upgrading the module as similar to pre_init. because after module gets installed pre_init will not be called.
Any suggestion for this ?
Why I need this ...
I have a stored procedure to generate report data quickly which uses postgresql stored procedure, now when there is a slight change in the procedure I would like to update it thourh the module upgrade process.
There should be some option available to call method during upgrade module as like pre_init and post_init.
I tried following methods to do this.
# Added following code in XML file
<function model="sale.order" name="action_custom_method"/>
#api.model
def action_custom_method(self):
# stored procedure code
return True
But this is not working for me, I am Using odoo 14.

Answer 1

in Odoo 14 it became pre_init_hook & post_init_hook. which would be set in the __manifest__.py
{
'pre_init_hook': pre_init_hook_method,
'post_init_hook': post_init_hook_method,
}
you also add the method definition in __init__.py
def pre_init_hook_method(cr):
env = api.Environment(cr, SUPERUSER_ID, {}) # to get env
def post_init_hook_method(cr, registry):
env = api.Environment(cr, SUPERUSER_ID, {}) # to get env
you may also use the migrations folder & module versioning like what is mentioned there Data Migration
so in your module folder you would have a migration folder. as the following structure:
<moduledir>
`-- migrations
|-- 1.0
| |-- pre-update_table_x.py
| |-- pre-update_table_y.py
| |-- post-create_plop_records.py
| |-- end-cleanup.py
| `-- README.txt # not processed
|-- 12.0.1.1 # processed only on a 12.0 server
| |-- pre-delete_table_z.py
| `-- post-clean-data.py
|-- 0.0.0
| `-- end-invariants.py # processed on all version update
so if your module defined with version like 12.0.1.1 before. you could increment a number to be like 12.0.1.2 in __manifest__.py. later on in your migration folder you add a new folder 12.0.1.2. where you could add pre- or post- python files. which would include you stored procedure definition. please also note that folder 0.0.0 will always run. if that didn't work it could be something else is wrong.
don't hesitate to let us know if you face any problems.

Answer 2

Finally, I got the solution.
We created one .sql file and into that file we added all our stored procedures and other database objects.
We added that sql file in the __manifest__.py
'data': [
'db_function/get_product_sales_history_data.sql',
'db_function/update_product_sales_history.sql',
],
It will execute these sql files at the time of module installation as well as module upgrade time.