[Fixed]-Django – Form not valid but no error

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29👍

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You have not passed any data to the form, so it is not valid. The instance argument is not used to set the form data, just the initial data.

👤Daniel Roseman

7👍

This is a humble attempt to provide a little background for Daniel Roseman’s answer above.

As you can see in the source, BaseForm.is_valid() does the following:

return self.is_bound and not self.errors

So, if is_valid() returns False, even though there are no errors, then is_bound must be False.

Now, the value for is_bound is assigned in BaseForm.__init__() (source):

self.is_bound = data is not None or files is not None

From the forms documentation:

A Form instance is either bound to a set of data, or unbound.

  • If it’s bound to a set of data, it’s capable of validating that data and rendering the form as HTML with the data displayed in the HTML.
  • If it’s unbound, it cannot do validation (because there’s no data to validate!), but it can still render the blank form as HTML.

Also note that errors is a property, which calls the full_clean() method (source), which does the actual validation.

👤djvg

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