Django Multiple Choice Field Checkbox Select Multiple

Question

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

User · Answer

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

User · Answer

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

User · Answer

The profile choices need to be setup as a ManyToManyField for this to work correctly   So    your model should be like this   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     choices   models ManyToManyField Choices    Then  sync the database and load up Choices with the various options you want available   Now  the ModelForm will build itself     class ProfileForm forms ModelForm     Meta      model   Profile     exclude     user     And finally  the view   if request method   POST     form   ProfileForm request POST    if form is valid        profile   form save commit False      profile user   request user     profile save   else    form   ProfileForm    return render to response template name    profile form   form   context instance RequestContext request     It should be mentioned that you could setup a profile in a couple different ways  including inheritance  That said  this should work for you as well   Good luck

User · Answer

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    lt label for     field id for label     gt    field label    lt  label gt    endif     lt 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    gt     if field help text    lt small id     field name   -help-text  class  form-text text-muted  gt    field help text   safe    lt  small gt    endif

User · Answer

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

User · Answer

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

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