I have a Django application and want to display multiple choice checkboxes in a user's profile. They will then be able to select multiple items.
This is a simplified version of my models.py:
from profiles.choices import SAMPLE_CHOICES
class Profile(models.Model):
user = models.ForeignKey(User, unique=True, verbose_name_('user'))
choice_field = models.CharField(_('Some choices...'), choices=SAMPLE_CHOICES, max_length=50)
And my form class:
class ProfileForm(forms.ModelForm):
choice_field = forms.MultipleChoiceField(choices=SAMPLE_CHOICES, widget=forms.CheckboxSelectMultiple)
class Meta:
model = Profile
And my views.py:
if request.method == "POST":
profile_form = form_class(request.POST, instance=profile)
if profile_form.is_valid():
...
profile.save()
return render_to_response(template_name, {"profile_form": profile_form,}, context_instance=RequestContext(request))
I can see that the POST is only sending one value:
choice_field u'choice_three'
And the local vars params is sending a list:
[u'choice_one', u'choice_two', u'choice_three']
All of the form fields display correct, but when I submit a POST, I get an error
Error binding parameter 7 - probably unsupported type.
Do I need to process the multiple choice field further in the view? Is the model field type correct? Any help or references would be greatly appreciated.
The models.CharField is a CharField representation of one of the choices. What you want is a set of choices. This doesn't seem to be implemented in django (yet).
You could use a many to many field for it, but that has the disadvantage that the choices have to be put in a database. If you want to use hard coded choices, this is probably not what you want.
There is a django snippet at http://djangosnippets.org/snippets/1200/ that does seem to solve your problem, by implementing a ModelField MultipleChoiceField
.
You can easily achieve this using ArrayField
:
# in my models...
tags = ArrayField(models.CharField(null=True, blank=True, max_length=100, choices=SECTORS_TAGS_CHOICES), blank=True, default=list)
# in my forms...
class MyForm(forms.ModelForm):
class Meta:
model = ModelClass
fields = [..., 'tags', ...]
I use tagsinput JS library to render my tags but you can use whatever you like: This my template for this widget:
{% if not hidelabel and field.label %}<label for="{{ field.id_for_label }}">{{ field.label }}</label>{% endif %}
<input id="{{ field.id_for_label }}" type="text" name="{{ field.name }}" data-provide="tagsinput"{% if field.value %} value="{{ field.value }}"{% endif %}{% if field.field.disabled %} disabled{% endif %}>
{% if field.help_text %}<small id="{{ field.name }}-help-text" class="form-text text-muted">{{ field.help_text | safe }}</small>{% endif %}
Brant's solution is absolutely correct, but I needed to modify it to make it work with multiple select checkboxes and commit=false
. Here is my solution:
models.py
class Choices(models.Model):
description = models.CharField(max_length=300)
class Profile(models.Model):
user = models.ForeignKey(User, blank=True, unique=True, verbose_name_('user'))
the_choices = models.ManyToManyField(Choices)
forms.py
class ProfileForm(forms.ModelForm):
the_choices = forms.ModelMultipleChoiceField(queryset=Choices.objects.all(), required=False, widget=forms.CheckboxSelectMultiple)
class Meta:
model = Profile
exclude = ['user']
views.py
if request.method=='POST':
form = ProfileForm(request.POST)
if form.is_valid():
profile = form.save(commit=False)
profile.user = request.user
profile.save()
form.save_m2m() # needed since using commit=False
else:
form = ProfileForm()
return render_to_response(template_name, {"profile_form": form}, context_instance=RequestContext(request))
ManyToManyField isn`t a good choice.You can use some snippets to implement MultipleChoiceField.You can be inspired by MultiSelectField with comma separated values (Field + FormField) But it has some bug in it.And you can install django-multiselectfield.This is more prefect.
The easiest way I found (just I use eval() to convert string gotten from input to tuple to read again for form instance or other place)
This trick works very well
#model.py
class ClassName(models.Model):
field_name = models.CharField(max_length=100)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if self.field_name:
self.field_name= eval(self.field_name)
#form.py
CHOICES = [('pi', 'PI'), ('ci', 'CI')]
class ClassNameForm(forms.ModelForm):
field_name = forms.MultipleChoiceField(choices=CHOICES)
class Meta:
model = ClassName
fields = ['field_name',]
Source: Stackoverflow.com