diff --git a/odoo/addons/test_new_api/models/test_new_api.py b/odoo/addons/test_new_api/models/test_new_api.py
index 592b95db0d5..ddef5c09686 100644
--- a/odoo/addons/test_new_api/models/test_new_api.py
+++ b/odoo/addons/test_new_api/models/test_new_api.py
@@ -347,6 +347,7 @@ class Foo(models.Model):
     name = fields.Char()
     value1 = fields.Integer(change_default=True)
     value2 = fields.Integer()
+    text = fields.Char(trim=False)
 
 
 class Bar(models.Model):
@@ -357,6 +358,8 @@ class Bar(models.Model):
     foo = fields.Many2one('test_new_api.foo', compute='_compute_foo', search='_search_foo')
     value1 = fields.Integer(related='foo.value1', readonly=False)
     value2 = fields.Integer(related='foo.value2', readonly=False)
+    text1 = fields.Char('Text1', related='foo.text', readonly=False)
+    text2 = fields.Char('Text2', related='foo.text', readonly=False, trim=True)
 
     @api.depends('name')
     def _compute_foo(self):
diff --git a/odoo/addons/test_new_api/tests/test_new_fields.py b/odoo/addons/test_new_api/tests/test_new_fields.py
index 820f95497db..1223366053f 100644
--- a/odoo/addons/test_new_api/tests/test_new_fields.py
+++ b/odoo/addons/test_new_api/tests/test_new_fields.py
@@ -1198,6 +1198,23 @@ class TestFields(TransactionCaseWithUserDemo):
         discussion_field = discussion.fields_get(['name'])['name']
         self.assertEqual(message_field['help'], discussion_field['help'])
 
+    def test_25_related_attributes(self):
+        """ test the attributes of related fields """
+        text = self.registry['test_new_api.foo'].text
+        self.assertFalse(text.trim, "The target field is defined with trim=False")
+
+        # trim=True is the default on the field's class
+        self.assertTrue(type(text).trim, "By default, a Char field has trim=True")
+
+        # the parameter 'trim' is not set in text1's definition, so the field
+        # retrieves its value from text.trim
+        text1 = self.registry['test_new_api.bar'].text1
+        self.assertFalse(text1.trim, "The related field retrieves trim=False from target")
+
+        # text2 is defined with trim=True, so it should get that value
+        text2 = self.registry['test_new_api.bar'].text2
+        self.assertTrue(text2.trim, "The related field was defined with trim=True")
+
     def test_25_related_single(self):
         """ test related fields with a single field in the path. """
         record = self.env['test_new_api.related'].create({'name': 'A'})
diff --git a/odoo/addons/test_new_api/tests/test_schema.py b/odoo/addons/test_new_api/tests/test_schema.py
index ede1a790f96..90bdc1836b4 100644
--- a/odoo/addons/test_new_api/tests/test_schema.py
+++ b/odoo/addons/test_new_api/tests/test_schema.py
@@ -150,7 +150,7 @@ class TestSchema(common.TransactionCase):
         columns_data = self.get_columns_data('test_new_api_foo')
         self.assertEqual(set(columns_data),
                          {'id', 'create_date', 'create_uid', 'write_date',
-                          'write_uid', 'name', 'value1', 'value2'})
+                          'write_uid', 'name', 'value1', 'value2', 'text'})
 
         # retrieve schema data about the table's foreign keys
         foreign_keys = self.get_foreign_keys('test_new_api_foo')
diff --git a/odoo/fields.py b/odoo/fields.py
index 6ef211e12a8..74e9d71cbc9 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -418,9 +418,7 @@ class Field(MetaField('DummyField', (object,), {})):
         if extra_keys:
             attrs['_extra_keys'] = extra_keys
 
-        for key, val in attrs.items():
-            if getattr(self, key, Default) != val:
-                setattr(self, key, val)
+        self.__dict__.update(attrs)
 
         # prefetch only stored, column, non-manual and non-deprecated fields
         if not (self.store and self.column_type) or self.manual or self.deprecated:
@@ -553,7 +551,9 @@ class Field(MetaField('DummyField', (object,), {})):
 
         # copy attributes from field to self (string, help, etc.)
         for attr, prop in self.related_attrs:
-            if not getattr(self, attr):
+            # check whether 'attr' is explicitly set on self (from its field
+            # definition), and ignore its class-level value (only a default)
+            if attr not in self.__dict__:
                 setattr(self, attr, getattr(field, prop))
 
         for attr in field._extra_keys: