human
Complete the below
def budget():

    ''''RESTful CRUD controller'
    '''
assistant
#Here is the Python code you requested.
    def prep(r):
        if ((r.method == 'timeplot') and (r.get_vars.get('component') == 'allocation')):
            query = (FS('allocation.start_date') != None)
            r.resource.add_component_filter('allocation', query)
        return True
    s3.prep = prep
    return s3_rest_controller(rheader=s3db.budget_rheader)