Sorting WTForms form.errors dict

Question

The forms.errors dict seems to be sorted on field name, and not on the order they are declared in the form itself.

E.g.

class ProductForm(Form): 
    code = TextField('Code', validators=[Required()]) 
    description = TextField('Description', validators=[Required(), Length(max=100)]) 
    amount = DecimalField('Amount', validators=[Required(), NumberRange(min=0.00, max=1000000.00)]) 
    vat_percentage = DecimalField('VAT %', validators=[Required(), NumberRange(min=0.00, max=100.00)]) 
    inactive_date = DateField('Inactive date', validators=[Optional()])

Which produces the form.errors like:

{'amount': ['Amount is required'], 'code': ['Code is invalid.'], 
'description': ['Description is required'], 'vat_percentage': ['VAT % is required']}

What I would like to do is print the the errors in the order as they are ordered in the form.

Is this possible?

Sean Vieira · Accepted Answer · 2013-03-16 13:18:03Z

4

Dictionaries are inherently unordered (in Python). However, WTForms includes each field's errors on the field as well as the form and it does guarantee that the fields can be enumerated in declared order. So rather than enumerating form.errors you can loop over form and then loop over each field.errors to get them in order:

for field in form:
    for error in field.errors:
        # Display error

answered Mar 16, 2013 at 13:18

Sean Vieira

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