Question

Getting a strange error when defining my django forms. I get the error:

__init__() got multiple values for keyword argument 'choices'

This happens with both TestForm and SpeciesForm (quoted below); basically both forms with the ‘choices’ keyword argument. init() is never explicitly called, and the forms aren’t even instantiated in the view yet. There’s one ModelForm and one plain Form.

from django import forms as f
from orders.models import *

class TestForm(f.Form):
    species = f.ChoiceField('Species', choices=Specimen.SPECIES)
    tests = f.MultipleChoiceField('Test', choices=Test.TESTS, widget=f.CheckboxSelectMultiple())
    dna_extraction = f.CharField('DNA extraction', help_text='If sending pre-extracted DNA, we require at least 900 ng')

class SpeciesForm(f.ModelForm):
    TYPE_CHOICES = (
        ('blood', 'Blood'),
        ('dna', 'Extracted DNA'),
    )
    dam_provided = f.BooleanField('DAM', help_text='Is dam for this specimen included in sample shipment?')
    sample_type = f.ChoiceField('Type of sample', choices=TYPE_CHOICES)
    dna_concentration = f.CharField('DNA concentration', help_text='If sending extracted DNA, approximate concentration')

    class Meta:
        exclude = ['order']
        model = Specimen

Any help would be appreciated. Not sure why this is happening as the forms are pretty bare-bones.

Answer 1

http://code.djangoproject.com/browser/django/trunk/django/forms/fields.py#L647

647     def __init__(self, choices=(), required=True, widget=None, label=None,
648                  initial=None, help_text=None, *args, **kwargs):
649         super(ChoiceField, self).__init__(required=required, widget=widget, label=label,
650                                         initial=initial, help_text=help_text, *args, **kwargs)

use:

species = f.ChoiceField(label='Species', choices=Specimen.SPECIES)
tests = f.MultipleChoiceField(label='Test', choices=Test.TESTS, widget=f.CheckboxSelectMultiple())

and:

sample_type = f.ChoiceField(label='Type of sample', choices=TYPE_CHOICES)

---

This is assuming that your choices are valid. Not sure what Specimen.SPECIES and Test.TESTS are. Those should be iterable of two-tuples according to:

ChoiceField.choices

An iterable (e.g., a list or tuple) of
2-tuples to use as choices for this
field. This argument accepts the same
formats as the choices argument to a
model field. See the model field
reference documentation on choices for
more details.