Add Select2 mixin that uses Django's own select template

Author: codingjoe

django_select2/forms.py

@@ -54,7 +54,7 @@
 
 import django
 from django import forms
-from django.contrib.admin.widgets import SELECT2_TRANSLATIONS
+from django.contrib.admin.widgets import SELECT2_TRANSLATIONS, AutocompleteMixin
 from django.core import signing
 from django.db.models import Q
 from django.forms.models import ModelChoiceIterator
@@ -79,6 +79,9 @@ class Select2Mixin:
     form media.
     """
 
+    css_class_name = "django-select2"
+    theme = None
+
     empty_label = ""
 
     def __init__(self, *args, **kwargs):
@@ -90,7 +93,7 @@ def build_attrs(self, base_attrs, extra_attrs=None):
         default_attrs = {
             "lang": self.i18n_name,
             "data-minimum-input-length": 0,
-            "data-theme": settings.SELECT2_THEME,
+            "data-theme": self.theme or settings.SELECT2_THEME,
         }
         if self.is_required:
             default_attrs["data-allow-clear"] = "false"
@@ -102,9 +105,9 @@ def build_attrs(self, base_attrs, extra_attrs=None):
         attrs = super().build_attrs(default_attrs, extra_attrs=extra_attrs)
 
         if "class" in attrs:
-            attrs["class"] += " django-select2"
+            attrs["class"] += " " + self.css_class_name
         else:
-            attrs["class"] = "django-select2"
+            attrs["class"] = self.css_class_name
         return attrs
 
     def optgroups(self, name, value, attrs=None):
@@ -137,6 +140,20 @@ def media(self):
         )
 
 
+class Select2AdminMixin:
+    """Select2 mixin that uses Django's own select template."""
+
+    css_class_name = "admin-autocomplete"
+    theme = "admin-autocomplete"
+
+    @property
+    def media(self):
+        return forms.Media(
+            js=Select2Mixin.media.js,
+            css=AutocompleteMixin.media.css,
+        )
+
+
 class Select2TagMixin:
     """Mixin to add select2 tag functionality."""