Fixed loading translations with language subtags in Select2 widget.

django_select2/forms.py

@@ -76,9 +76,16 @@ class Select2Mixin:
 
     empty_label = ""
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.i18n_name = SELECT2_TRANSLATIONS.get(get_language())
+
     def build_attrs(self, base_attrs, extra_attrs=None):
         """Add select2 data attributes."""
-        default_attrs = {"data-minimum-input-length": 0}
+        default_attrs = {
+            "lang": self.i18n_name,
+            "data-minimum-input-length": 0,
+        }
         if self.is_required:
             default_attrs["data-allow-clear"] = "false"
         else:
@@ -100,32 +107,28 @@ def optgroups(self, name, value, attrs=None):
             self.choices = list(chain([("", "")], self.choices))
         return super().optgroups(name, value, attrs=attrs)
 
-    def _get_media(self):
+    @property
+    def media(self):
         """
         Construct Media as a dynamic property.
 
         .. Note:: For more information visit
             https://docs.djangoproject.com/en/stable/topics/forms/media/#media-as-a-dynamic-property
         """
-        lang = get_language()
         select2_js = (settings.SELECT2_JS,) if settings.SELECT2_JS else ()
         select2_css = (settings.SELECT2_CSS,) if settings.SELECT2_CSS else ()
 
-        i18n_name = SELECT2_TRANSLATIONS.get(lang)
-        if i18n_name not in settings.SELECT2_I18N_AVAILABLE_LANGUAGES:
-            i18n_name = None
-
-        i18n_file = (
-            ("%s/%s.js" % (settings.SELECT2_I18N_PATH, i18n_name),) if i18n_name else ()
-        )
+        i18n_file = ()
+        if self.i18n_name in settings.SELECT2_I18N_AVAILABLE_LANGUAGES:
+            i18n_file = (
+                ("%s/%s.js" % (settings.SELECT2_I18N_PATH, self.i18n_name),)
+            )
 
         return forms.Media(
             js=select2_js + i18n_file + ("django_select2/django_select2.js",),
             css={"screen": select2_css + ("django_select2/django_select2.css",)},
         )
 
-    media = property(_get_media)
-
 
 class Select2TagMixin:
     """Mixin to add select2 tag functionality."""
@@ -212,11 +215,7 @@ def __init__(self, attrs=None, choices=(), **kwargs):
                 Value is a name of a field in a model (used in `queryset`).
 
         """
-        self.choices = choices
-        if attrs is not None:
-            self.attrs = attrs.copy()
-        else:
-            self.attrs = {}
+        super().__init__(attrs, choices)
 
         self.uuid = str(uuid.uuid4())
         self.field_id = signing.dumps(self.uuid)

tests/test_forms.py

@@ -3,6 +3,7 @@
 from collections.abc import Iterable
 
 import pytest
+from django.contrib.admin.widgets import SELECT2_TRANSLATIONS
 from django.db.models import QuerySet
 from django.urls import reverse
 from django.utils import translation
@@ -46,6 +47,12 @@ def test_initial_form_class(self):
         assert "my-class" in widget.render("name", None)
         assert "django-select2" in widget.render("name", None)
 
+    @pytest.mark.parametrize("code,name", SELECT2_TRANSLATIONS.items())
+    def test_lang_attr(self, code, name):
+        translation.activate(code)
+        widget = self.widget_cls()
+        assert f'lang="{name}"' in widget.render("name", None)
+
     def test_allow_clear(self, db):
         required_field = self.form.fields["artist"]
         assert required_field.required is True
@@ -219,6 +226,12 @@ def test_initial_form_class(self):
             "name", None
         )
 
+    @pytest.mark.parametrize("code,name", SELECT2_TRANSLATIONS.items())
+    def test_lang_attr(self, code, name):
+        translation.activate(code)
+        widget = self.widget_cls(data_view="heavy_data_1")
+        assert f'lang="{name}"' in widget.render("name", None)
+
     def test_selected_option(self, db):
         not_required_field = self.form.fields["primary_genre"]
         assert not_required_field.required is False

tests/testapp/settings.py

@@ -25,6 +25,7 @@
     ("de", "German"),
     ("en", "English"),
 ]
+LANGUAGE_CODE = "en"
 
 TEMPLATES = [
     {