Fixed #33863 -- Fixed JavaScriptCatalog with more than 1 level of fallback translations.

Co-authored-by: Carlos Mermingas <cmermingas@gmail.com>

django/views/i18n.py

@@ -1,4 +1,3 @@
-import itertools
 import json
 import os
 import re
@@ -273,26 +272,27 @@ class JavaScriptCatalog(View):
 
     def get_catalog(self):
         pdict = {}
-        num_plurals = self._num_plurals
         catalog = {}
-        trans_cat = self.translation._catalog
-        trans_fallback_cat = (
-            self.translation._fallback._catalog if self.translation._fallback else {}
-        )
+        translation = self.translation
         seen_keys = set()
-        for key, value in itertools.chain(
-            trans_cat.items(), trans_fallback_cat.items()
-        ):
-            if key == "" or key in seen_keys:
-                continue
-            if isinstance(key, str):
-                catalog[key] = value
-            elif isinstance(key, tuple):
-                msgid, cnt = key
-                pdict.setdefault(msgid, {})[cnt] = value
+        while True:
+            for key, value in translation._catalog.items():
+                if key == "" or key in seen_keys:
+                    continue
+                if isinstance(key, str):
+                    catalog[key] = value
+                elif isinstance(key, tuple):
+                    msgid, cnt = key
+                    pdict.setdefault(msgid, {})[cnt] = value
+                else:
+                    raise TypeError(key)
+                seen_keys.add(key)
+            if translation._fallback:
+                translation = translation._fallback
             else:
-                raise TypeError(key)
-            seen_keys.add(key)
+                break
+
+        num_plurals = self._num_plurals
         for k, v in pdict.items():
             catalog[k] = [v.get(i, "") for i in range(num_plurals)]
         return catalog

tests/view_tests/custom_locale_path/es/LC_MESSAGES/djangojs.po

@@ -0,0 +1,20 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2007-09-15 16:45+0200\n"
+"PO-Revision-Date: 2010-05-12 12:57-0300\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: media/js/translate.js:1
+msgid "custom_locale_path: this is to be translated"
+msgstr "custom_locale_path: esto tiene que ser traducido"

tests/view_tests/custom_locale_path/es_MX/LC_MESSAGES/djangojs.po

@@ -0,0 +1,20 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2007-09-15 16:45+0200\n"
+"PO-Revision-Date: 2010-05-12 12:57-0300\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: media/js/translate.js:1
+msgid "custom_locale_path: this is to be translated"
+msgstr ""

tests/view_tests/tests/test_i18n.py

@@ -344,6 +344,27 @@ class I18NViewTests(SimpleTestCase):
             self.assertContains(response, "il faut le traduire")
             self.assertNotContains(response, "Untranslated string")
 
+    def test_jsi18n_fallback_language_with_custom_locale_dir(self):
+        """
+        The fallback language works when there are several levels of fallback
+        translation catalogs.
+        """
+        locale_paths = [
+            path.join(
+                path.dirname(path.dirname(path.abspath(__file__))),
+                "custom_locale_path",
+            ),
+        ]
+        with self.settings(LOCALE_PATHS=locale_paths), override("es_MX"):
+            response = self.client.get("/jsi18n/")
+            self.assertContains(
+                response, "custom_locale_path: esto tiene que ser traducido"
+            )
+            response = self.client.get("/jsi18n_no_packages/")
+            self.assertContains(
+                response, "custom_locale_path: esto tiene que ser traducido"
+            )
+
     def test_i18n_fallback_language_plural(self):
         """
         The fallback to a language with less plural forms maintains the real

tests/view_tests/urls.py

@@ -31,6 +31,7 @@ urlpatterns = [
     # i18n views
     path("i18n/", include("django.conf.urls.i18n")),
     path("jsi18n/", i18n.JavaScriptCatalog.as_view(packages=["view_tests"])),
+    path("jsi18n_no_packages/", i18n.JavaScriptCatalog.as_view()),
     path("jsi18n/app1/", i18n.JavaScriptCatalog.as_view(packages=["view_tests.app1"])),
     path("jsi18n/app2/", i18n.JavaScriptCatalog.as_view(packages=["view_tests.app2"])),
     path("jsi18n/app5/", i18n.JavaScriptCatalog.as_view(packages=["view_tests.app5"])),