[FIX] fields: inherited fields should get 'string' from their parent field

Because some parameters of a field may be determined during its setup, we have
to update the corresponding column after the setup, and recompute _all_columns
to make it consistent.

openerp/fields.py

@@ -319,7 +319,8 @@ class Field(object):
                 self._free_attrs.append(attr)
             setattr(self, attr, value)
 
-        if not self.string:
+        if not self.string and not self.related:
+            # related fields get their string from their parent field
             self.string = name.replace('_', ' ').capitalize()
 
         # determine self.default and cls._defaults in a consistent way

openerp/models.py

@@ -2980,6 +2980,12 @@ class BaseModel(object):
                 if not partial:
                     raise
 
+        # update columns (fields may have changed), and column_infos
+        for name, field in self._fields.iteritems():
+            if field.store:
+                self._columns[name] = field.to_column()
+        self._inherits_reload()
+
         # group fields by compute to determine field.computed_fields
         fields_by_compute = defaultdict(list)
         for field in self._fields.itervalues():