Custom ModelView with column_searchable_list does not work

[ogun-]

I registered a custom ModelView to my CompanyModel

from sandman import app
from sandman.model import register, Model, activate
from flask.ext.admin.contrib.sqla import ModelView

class CompanyView(ModelView):
    column_searchable_list = ('name',)
    column_list = ('name',)

class Company(Model):
    __tablename__ = 'company'
    __endpoint__ = 'Company'
    __view__ = CompanyView

This throws an exception:

  File "/usr/local/lib/python2.7/dist-packages/Flask_Admin-1.0.8-py2.7.egg/flask_admin/model/base.py", line 540, in _refresh_cache
    self._search_supported = self.init_search()
  File "/usr/local/lib/python2.7/dist-packages/Flask_Admin-1.0.8-py2.7.egg/flask_admin/contrib/sqla/view.py", line 414, in init_search
    'Failed to setup search for "%s"' % p)
Exception: Can only search on text columns. Failed to setup search for "name"

The problem seems to be that sqlalchemy (0.9.8) reflection inspector detects String Columns (as defined in my model) as VARCHAR Columns. This does not match any of flask-admins allowed text column types:

def is_text_column_type(self, name):
    ...
    return name in ('string', 'unicode', 'text', 'unicodetext')