django,validation,django-forms , Interdependent validation of form and formset


Interdependent validation of form and formset

Question:

Tag: django,validation,django-forms

I have a view that allows the creation of an invoice by prompting for invoice header information through a normal Django form (InvoiceForm), and on the same page for line item information using a formset (ItemForm). This has worked fine for several years now.

I want to introduce a new validation criterion that references a value in the form (specifically, the invoice date) and a value in each formset entry (the tax rate). I can't see a way for the InvoiceForm validation function to reference the ItemForm values or vice-versa - will I just have to carry out the validation manually in the view and inject the errors into the otherwise valid forms?


Answer:

If they are in the same page, and inside the same <form> tag, then you should be able to access each other in the validation Django POST back view (action of the form).

Your other method would be to use javascript/ajax calls to do validation between the two forms on the page.


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