Forms are a common feature found on websites. We already have all the tools needed to implement one: a QWeb template can provide the HTML for the form, the corresponding submit action can be an URL, processed by a controller that can run all the validation logic, and finally store the data in the proper model.

But for non-trivial forms this can be a demanding task. It's not that simple to perform all the needed validations and provide feedback to the user about what is wrong.

Since this is a common need, a website_form addon is available to aid us with this. Let's see how to use it.

Looking back at the Add button in the Todo Task list, we can see that it opens the /todo/add URL. This will present a form to submit a new Todo Task, and the fields available will be the task name, a person (user) responsible for the task, and a file attachment.

We should start by adding the website_form dependency to our addon module. We can replace website, since keeping it explicitly would be redundant...