WTForms: How to select options in SelectMultipleField?

Question

Choices can be set using form.myfield.choices=[(\"1\",\"Choice1\"), (\"2\",\"Choice2\")]

What is the way to set the selected option?

Answer 1

None of these answers worked for me (WTForms 2.2); all of them led to the same issue. When I submitted data via a POST request, the values I set as defaults (whether by .default, .data, .process_data(), or .process()) would be returned to my controller regardless of edits I made to the values in the form in the browser.

To resolve this, I passed the request type back to my controller and if it was a POST request, I skipped past the part where I set the default values.

form = controller.getForm(request= request.method)

and in the controller where I handled the submission,

getForm(request="")
# ...
if request != "POST":
    # Set the default values for the form
else:
    # Go straight to validating the form data