diff --git a/attachment_s3/models/ir_attachment.py b/attachment_s3/models/ir_attachment.py
index 2fe55a4..0513291 100644
--- a/attachment_s3/models/ir_attachment.py
+++ b/attachment_s3/models/ir_attachment.py
@@ -90,7 +90,7 @@ class IrAttachment(models.Model):
                 if fname:
                     self._file_delete(fname)
                 continue
-            self._data_set('datas', attach.datas, None)
+            attach._data_set('datas', attach.datas, None)
 
     def _register_hook(self, cr):
         super(IrAttachment, self)._register_hook(cr)
diff --git a/base_attachment_object_storage/models/ir_attachment.py b/base_attachment_object_storage/models/ir_attachment.py
index 8ece688..6fc56ea 100644
--- a/base_attachment_object_storage/models/ir_attachment.py
+++ b/base_attachment_object_storage/models/ir_attachment.py
@@ -9,7 +9,7 @@ import psycopg2
 import odoo
 
 from contextlib import closing, contextmanager
-from openerp import api, exceptions, models, _
+from openerp import api, exceptions, fields, models, _
 from openerp import SUPERUSER_ID
 
 
@@ -40,6 +40,19 @@ class IrAttachment(models.Model):
 
     _local_fields = ('image_small', 'image_medium', 'web_icon_data')
 
+    datas = fields.Binary(
+        compute='_compute_datas',
+        inverse='_inverse_datas',
+        string='File Content',
+        nodrop=True,
+    )
+
+    @api.depends('store_fname', 'db_datas')
+    def _compute_datas(self):
+        values = self._data_get('datas', None)
+        for attach in self:
+            attach.datas = values.get(attach.id)
+
     @api.cr
     def _register_hook(self, cr):
         super(IrAttachment, self)._register_hook(cr)
@@ -128,7 +141,7 @@ class IrAttachment(models.Model):
                 if fname:
                     self._file_delete(fname)
                 continue
-            super(IrAttachment, attach)._inverse_datas()
+            attach._data_set('datas', attach.datas, None)
 
     @api.model
     def _file_read(self, fname, bin_size=False):