'Read encoded parameter values from the database and turn back into a
dict of tool parameter values.'

def get_param_values(self, app, ignore_errors=False):

    param_dict = self.raw_param_dict()
    tool = app.toolbox.get_tool(self.tool_id, tool_version=self.tool_version)
    param_dict = tool.params_from_strings(param_dict, app, ignore_errors=ignore_errors)
    return param_dict
