armor

sub = Blueprint('sub', __name__, subdomain='<trademark>')
@sub.url_defaults
def add_trademark(endpoint, values):
    values.setdefault('trademark', g.a_trademark)
@sub.url_value_preprocessor
def pull_trademark(endpoint, values):
    g.a_trademark = values.pop('trademark')
    query = City.query.filter(Company.url==g.a_trademark)
    g.trademark = query.first_or_404()