checkbox > render value

I'm using CheckBoxFieldRenderer for rendering sqlalchemy boolean column 
(can_read = Column(Boolean, default=0)). When I generate form and it's submited 
it doesnt remember checkbox value (if it's checked). The problem is in 
CheckBoxFieldRenderer in render method:

class CheckBoxFieldRenderer(FieldRenderer):
    """render a boolean value as checkbox field"""
    def render(self, **kwargs):
        return h.check_box(self.name, True, checked=_simple_eval(self.value or ''), **kwargs)

This always returns '' (if true is passed). 
I fixed it by subclassing and capitalizing input (true to True).

class CheckBoxFieldFixedRenderer(CheckBoxFieldRenderer):
    def render(self, **kwargs):
        return h.check_box(
            self.name, True, 
            checked=_simple_eval((self.value or '').capitalize()), 
            **kwargs
        )

Original issue reported on code.google.com by mkr...@gmail.com on 20 Jan 2011 at 12:03

pombreda / formalchemy

checkbox > render value #161