[IMP] mail, mass_mailing, crm : stringify _primary_email

_primary_email was an array to be able to use it directly in the
depends. Typically a 'depends' with a computed value (lambda) needs
an array. Otherwise, it will only take the first character of the
field name string.

By setting _primary_email as a string, the lambda should always get
an array. But it simplifies a lot the usage of the _primary_email.
also, having an array was confusing as we could think that more than
one field can be considered as the primary email. This is not the
goal hare. So having the _primary_email as a single string is more
'self describing'. Only one field should be the _primary_email.

addons/crm/models/crm_lead.py

@@ -51,7 +51,7 @@ class Lead(models.Model):
     _description = "Lead/Opportunity"
     _order = "priority desc,activity_date_deadline,id desc"
     _inherit = ['mail.thread', 'mail.activity.mixin', 'utm.mixin', 'format.address.mixin', 'mail.blacklist.mixin']
-    _primary_email = ['email_from']
+    _primary_email = 'email_from'
 
     def _default_probability(self):
         stage_id = self._default_stage_id()

addons/mail/models/mail_address_mixin.py

@@ -20,24 +20,20 @@ class MailAddressMixin(models.AbstractModel):
         """
     _name = 'mail.address.mixin'
     _description = 'Email address mixin'
-    _primary_email = ['email']
+    _primary_email = 'email'
 
     email_normalized = fields.Char(string='Normalized email address', compute="_compute_email_normalized", invisible=True,
                                   compute_sudo=True, store=True, help="""This field is used to search on email address,
                                   as the primary email field can contain more than strictly an email address.""")
 
-    @api.depends(lambda self: self._primary_email)
+    @api.depends(lambda self: [self._primary_email])
     def _compute_email_normalized(self):
         self._assert_primary_email()
-        [email_field] = self._primary_email
         for record in self:
-            record.email_normalized = tools.email_normalize(record[email_field])
+            record.email_normalized = tools.email_normalize(record[self._primary_email])
 
     def _assert_primary_email(self):
-        if not hasattr(self, "_primary_email") or \
-                not isinstance(self._primary_email, (list, tuple)) or \
-                not len(self._primary_email) == 1:
+        if not hasattr(self, "_primary_email") or not isinstance(self._primary_email, str):
             raise UserError(_('Invalid primary email field on model %s') % self._name)
-        field_name = self._primary_email[0]
-        if field_name not in self._fields or self._fields[field_name].type != 'char':
+        if self._primary_email not in self._fields or self._fields[self._primary_email].type != 'char':
             raise UserError(_('Invalid primary email field on model %s') % self._name)

addons/mail/models/mail_channel.py

@@ -24,7 +24,7 @@ class ChannelPartner(models.Model):
     _description = 'Listeners of a Channel'
     _table = 'mail_channel_partner'
     _rec_name = 'partner_id'
-    _primary_email = ['partner_email']
+    _primary_email = 'partner_email'
 
     partner_id = fields.Many2one('res.partner', string='Recipient', ondelete='cascade')
     partner_email = fields.Char('Email', related='partner_id.email', readonly=False)

addons/test_mass_mailing/models/mass_mail_test.py

@@ -10,7 +10,7 @@ class MassMailTest(models.Model):
     _description = 'Simple Mass Mailing Model'
     _name = 'mass.mail.test'
     _inherit = ['mail.thread', 'mail.address.mixin']
-    _primary_email = ['email_from']
+    _primary_email = 'email_from'
 
     name = fields.Char()
     email_from = fields.Char()
@@ -22,7 +22,7 @@ class MassMailTestBlacklist(models.Model):
     _name = 'mass.mail.test.bl'
     _inherit = ['mail.thread', 'mail.blacklist.mixin']
 
-    _primary_email = ['email_from']  # blacklist field to check
+    _primary_email = 'email_from'  # blacklist field to check
 
     name = fields.Char()
     email_from = fields.Char()

addons/test_mass_mailing/tests/test_blacklist_mixin.py

@@ -25,23 +25,15 @@ class TestBLMixin(common.MassMailingCase):
 
     @users('emp')
     def test_bl_mixin_primary_field_consistency(self):
-        MassMailTestBlacklist._primary_email = ['not_a_field']
+        MassMailTestBlacklist._primary_email = 'not_a_field'
         with self.assertRaises(UserError):
             self.env['mass.mail.test.bl'].search([('is_blacklisted', '=', False)])
 
-        MassMailTestBlacklist._primary_email = 'not_a_list'
+        MassMailTestBlacklist._primary_email = ['not_a_str']
         with self.assertRaises(UserError):
             self.env['mass.mail.test.bl'].search([('is_blacklisted', '=', False)])
 
         MassMailTestBlacklist._primary_email = 'email_from'
-        with self.assertRaises(UserError):
-            self.env['mass.mail.test.bl'].search([('is_blacklisted', '=', False)])
-
-        MassMailTestBlacklist._primary_email = ['email_from', 'name']
-        with self.assertRaises(UserError):
-            self.env['mass.mail.test.bl'].search([('is_blacklisted', '=', False)])
-
-        MassMailTestBlacklist._primary_email = ['email_from']
         self.env['mass.mail.test.bl'].search([('is_blacklisted', '=', False)])
 
     @users('emp')