On 9/5/06, BJörn Lindqvist <[EMAIL PROTECTED]> wrote: > What I'm wondering is how does the decorators validate and > error_handler really work?
Do not ask how sausage is made! Actually, if you _really_ want to know how it all works, you'll have to read the source. There's more code involved than I can reasonably cover in an email. You'll want to look at controllers.py, errorhandling.py and widgets/forms.py. > Validate seem to magically change the > arguments to save() to python objects instead of text strings. This is done by calling FormEncode behind the scenes. Formencode has documentation but the source is pretty clear. >Then > the error_handler decorator I think makes a HTTPRedirect back to add() > if validation fails. I'm pretty sure that there isn't a HTTPRedirect involved, the add() method is called by the error handling code and tg_errors is injected into the parameters list. > But how does it manage to display the error > messages in the form? tg_errors is a dictionary of formencode.Invalid instances. The form widget checks this error dict while building the form and generates the message by str()'ing the invalid instance. > How does the form know that it should display > the values that you wrote there previously when you are redirected > back? The values are still in the CherryPy environmental variables, the widgets pull their data from there if they aren't passed in data. > I would like to implement code similar to the example above, but > without using a form widget. And preferably without using the validate > and error_handler decorators. Maybe someone can show me an example of > that? The pieces really are designed to work together. You can use them separately, but building this system has consumed most of the development effort in TurboGears thus far. I'm curious what you can't accomplish by re-templating the current system. -- Karl --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "TurboGears" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/turbogears -~----------~----~----~----~------~----~------~--~---
