django-select2-forms 2.0.2

select2.fields.ForeignKey examples

In the following two examples, an “entry” is associated with only one author. The example below does not use ajax, but instead performs autocomplete filtering on the client-side using the <option> elements (the labels of which are drawn from Author.__str__()) in an html <select>.

@python_2_unicode_compatible
class Author(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

class Entry(models.Model):
    author = select2.fields.ForeignKey(Author,
        overlay="Choose an author...",
        on_delete=models.CASCADE)

This more advanced example autocompletes via ajax using the Author.name field and limits the autocomplete search to Author.objects.filter(active=True)

class Author(models.Model):
    name = models.CharField(max_length=100)
    active = models.BooleanField()

class Entry(models.Model):
    author = select2.fields.ForeignKey(Author,
        limit_choices_to=models.Q(active=True),
        ajax=True,
        search_field='name',
        overlay="Choose an author...",
        js_options={
            'quiet_millis': 200,
        },
        on_delete=models.CASCADE)

select2.fields.ManyToManyField examples

In the following basic example, entries can have more than one author. This example does not do author name lookup via ajax, but populates <option> elements in a <select> with Author.__unicode__() for labels.

@python_2_unicode_compatible
class Author(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

class Entry(models.Model):
    authors = select2.fields.ManyToManyField(Author)

The following “kitchen sink” example allows authors to be ordered, and uses ajax to autocomplete on two variants of an author’s name.

from django.db import models
from django.db.models import Q
import select2.fields
import select2.models

class Author(models.Model):
    name = models.CharField(max_length=100)
    alt_name = models.CharField(max_length=100, blank=True, null=True)

class Entry(models.Model):
    categories = select2.fields.ManyToManyField(Author,
        through='EntryAuthors',
        ajax=True,
        search_field=lambda q: Q(name__icontains=q) | Q(alt_name__icontains=q),
        sort_field='position',
        js_options={'quiet_millis': 200})

form field example

If you don’t need to use the ajax features of django-select2-forms it is possible to use select2 on django forms without modifying your models. The select2 formfields exist in the select2.fields module and have the same class names as their standard django counterparts (ChoiceField, MultipleChoiceField, ModelChoiceField, ModelMultipleChoiceField). Here is the first ForeignKey example above, done with django formfields.

class AuthorManager(models.Manager):
    def as_choices(self):
        for author in self.all():
            yield (author.pk, force_text(author))

@python_2_unicode_compatible
class Author(models.Model):
    name = models.CharField(max_length=100)
    objects = AuthorManager()

    def __str__(self):
        return self.name

class Entry(models.Model):
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

class EntryForm(forms.ModelForm):
    author = select2.fields.ChoiceField(
        choices=Author.objects.as_choices(),
        overlay="Choose an author...")

    class Meta:
        model = Entry