This branch is the combination of several optimizations in the ORM:
* store field values once in the cache: the cache reflects more
faithfully the database, only fields that explicitly depend on the
context have an extra indirection in the cache;
* delay recomputations by default: use method `recompute` to explicitly
flush out pending recomputations;
* delay updates in method `write`: updates are stored in a data
structure that can be flushed efficiently to the database with method
`flush` (which also flush out recomputations);
* make method `modified` take advantage of inverse fields to inverse
dependencies;
* filter records by evaluating a domain on records in Python;
* a computed field with `readonly=False` behaves like a normal field
with an onchange method;
* computed fields are computed in superuser mode by default.
Work done by Toufik Ben Jaa, Raphael Collet, Denis Ledoux and Fabien
Pinckaers.
closesodoo/odoo#35659
Signed-off-by: Denis Ledoux <beledouxdenis@users.noreply.github.com>
Purpose
=======
mail.tracking.values should be deleted when the corresponding
field is deleted (when the module which defined it is uninstalled).
Firstly because we don't want useless data in db.
Secondly because the groups associated with the field can no longer
be checked if it was deleted. As we don't know to whom the value
was restricted, the value should not be displayed anyway.
Note: this case was fixed in saas-12.2 by b9e96b7 but the proper
way to fix it is to delete the tracking values.
Specification
=============
Delete `mail.tracking.value` when the associated
`ir.model.fields` is deleted.
Two alternatives were considered:
1. Change the `field` field of `mail.tracking.value` from Char
to a m2o to `ir.model.fields` which allows to use delete
oncascade. This implies to modify existing code, but more
importantly it adds database queries.
2. Override the unlink method of `ir.model.fields` to
first unlink associated tracking values.
The first method is probably cleaner but the second method
was nonetheless chosen as we don't want to impact
performance in the main tracking flow only to better
support module uninstalls which happens rarely.
Note: when a module is uninstalled, `ir.model.fields`
are unlinked one by one (in a for loop). Tracking values are
therefore also unlinked field by field. Batchifying field
deletion would greatly reduce the amount of queries.
Raphael Collet