1 files changed, 36 insertions, 0 deletions
diff --git a/addons/mail/models/ir_attachment.py b/addons/mail/models/ir_attachment.py
new file mode 100644
index 00000000..d1279c26
--- /dev/null
+++ b/addons/mail/models/ir_attachment.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, models
+from odoo.exceptions import AccessError
+
+class IrAttachment(models.Model):
+    _inherit = 'ir.attachment'
+
+    def _post_add_create(self):
+        """ Overrides behaviour when the attachment is created through the controller
+        """
+        super(IrAttachment, self)._post_add_create()
+        for record in self:
+            record.register_as_main_attachment(force=False)
+
+    def register_as_main_attachment(self, force=True):
+        """ Registers this attachment as the main one of the model it is
+        attached to.
+        """
+        self.ensure_one()
+        if not self.res_model:
+            return
+        related_record = self.env[self.res_model].browse(self.res_id)
+        if not related_record.check_access_rights('write', raise_exception=False):
+            return
+        # message_main_attachment_id field can be empty, that's why we compare to False;
+        # we are just checking that it exists on the model before writing it
+        if related_record and hasattr(related_record, 'message_main_attachment_id'):
+            if force or not related_record.message_main_attachment_id:
+                #Ignore AccessError, if you don't have access to modify the document
+                #Just don't set the value
+                try:
+                    related_record.message_main_attachment_id = self
+                except AccessError:
+                    pass