server.env.mixin _compute_server_env leaks onto res.partner when auth_partner is installed (Odoo 18)

[olaf-wagner]

Draft Issue: OCA/server-env

Title: server.env.mixin _compute_server_env leaks onto res.partner when auth_partner is installed (Odoo 18)

Body:

Module

server_environment (server.env.mixin)

Version

18.0

Description

When auth_partner (from OCA/rest-framework) is installed alongside server_environment, any write to res.partner raises:

AttributeError: 'res.partner' object has no attribute '_compute_server_env'

This causes 185 test failures across ~30 modules (auth_api_key, connector_search_engine, password_security, auth_saml, etc.).

Steps to Reproduce

1. Install Odoo 18 with server_environment and auth_partner (OCA/rest-framework) modules
2. Attempt any write to res.partner (e.g., archive a user, which triggers partner.signup_cancel())
3. Error: AttributeError: 'res.partner' object has no attribute '_compute_server_env'

Root Cause Analysis

server.env.mixin._setup_base() transforms fields by setting field.compute = "_compute_server_env" in-place on the field descriptor object. When auth_partner applies the mixin to auth.directory, this in-place modification appears to affect field descriptors shared with res.partner through Odoo's field registry. Since res.partner does not inherit server.env.mixin, the _compute_server_env method does not exist on it.

The error path:

1. users.write({'active': False})
2. → auth_signup calls partner.signup_cancel()
3. → partner.write({'signup_type': None})
4. → Odoo's determine() resolves a field's compute method
5. → getattr(records, "_compute_server_env") → AttributeError

Traceback

File "/opt/odoo/lib/odoo/odoo/fields.py", line 1425, in __set__
    records.write({self.name: write_value})
File "auth_totp_mail/models/res_users.py", line 11, in write
    res = super().write(vals)
File "auth_signup/models/res_users.py", line 362, in write
    self.partner_id.sudo().signup_cancel()
File "auth_signup/models/res_partner.py", line 111, in signup_cancel
    return self.write({'signup_type': None})
File "account/models/partner.py", line 816, in write
    res = super().write(vals)
File "/opt/odoo/lib/odoo/odoo/fields.py", line ~108, in determine
    needle = getattr(records, needle)
AttributeError: 'res.partner' object has no attribute '_compute_server_env'

Suggestion

_server_env_transform_field_to_read_from_env() currently modifies the field descriptor in-place (field.compute = "_compute_server_env"). Consider either:

• Creating a new computed field instead of modifying the existing descriptor
• Or ensuring the mixin's _setup_base() only operates on fields that belong exclusively to the current model (not shared descriptors)