[FIX] *: adapt code to comply with new ondelete policy

The ondelete policy must be explicitly set for m2o fields whose inverse
is a reflection model (ir.*)

addons/crm/models/crm_lead_scoring_frequency.py

@@ -18,4 +18,7 @@ class FrequencyField(models.Model):
     _description = 'Fields that can be used for predictive lead scoring computation'
 
     name = fields.Char(related="field_id.field_description")
-    field_id = fields.Many2one('ir.model.fields', domain=[('model_id.model', '=', 'crm.lead')], required=True)
+    field_id = fields.Many2one(
+        'ir.model.fields', domain=[('model_id.model', '=', 'crm.lead')], required=True,
+        ondelete='cascade',
+    )

addons/google_drive/models/google_drive.py

@@ -175,7 +175,7 @@ class GoogleDrive(models.Model):
         return config_values
 
     name = fields.Char('Template Name', required=True)
-    model_id = fields.Many2one('ir.model', 'Model', required=True)
+    model_id = fields.Many2one('ir.model', 'Model', required=True, ondelete='cascade')
     model = fields.Char('Related Model', related='model_id.model', readonly=True)
     filter_id = fields.Many2one('ir.filters', 'Filter', domain="[('model_id', '=', model)]")
     google_drive_template_url = fields.Char('Template URL', required=True)

addons/sms/models/sms_template.py

@@ -20,7 +20,7 @@ class SMSTemplate(models.Model):
     model_id = fields.Many2one(
         'ir.model', string='Applies to', required=True,
         domain=['&', ('is_mail_thread_sms', '=', True), ('transient', '=', False)],
-        help="The type of document this template can be used with")
+        help="The type of document this template can be used with", ondelete='cascade')
     model = fields.Char('Related Document Model', related='model_id.model', index=True, store=True, readonly=True)
     body = fields.Char('Body', translate=True, required=True)
     lang = fields.Char('Language', help="Use this field to either force a specific language (ISO code) or dynamically "