Fixed #35529 -- Added support for positional arguments in querystring template tag.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

AUTHORS

@@ -391,6 +391,7 @@ answer newbie questions, and generally made Django that much better:
     Georg "Hugo" Bauer <gb@hugo.westfalen.de>
     Georgi Stanojevski <glisha@gmail.com>
     Gerardo Orozco <gerardo.orozco.mosqueda@gmail.com>
+    Giannis Terzopoulos <terzo.giannis@gmail.com>
     Gil Gonçalves <lursty@gmail.com>
     Girish Kumar <girishkumarkh@gmail.com>
     Girish Sontakke <girishsontakke7@gmail.com>

django/template/defaulttags.py

@@ -4,12 +4,13 @@ import re
 import sys
 import warnings
 from collections import namedtuple
-from collections.abc import Iterable
+from collections.abc import Iterable, Mapping
 from datetime import datetime
 from itertools import cycle as itertools_cycle
 from itertools import groupby
 
 from django.conf import settings
+from django.http import QueryDict
 from django.utils import timezone
 from django.utils.html import conditional_escape, escape, format_html
 from django.utils.lorem_ipsum import paragraphs, words
@@ -1173,17 +1174,23 @@ def now(parser, token):
 
 
 @register.simple_tag(name="querystring", takes_context=True)
-def querystring(context, query_dict=None, **kwargs):
+def querystring(context, *args, **kwargs):
     """
-    Build a query string using `query_dict` and `kwargs` arguments.
+    Build a query string using `args` and `kwargs` arguments.
 
     This tag constructs a new query string by adding, removing, or modifying
-    parameters, starting from the given `query_dict` (defaulting to
-    `request.GET`). Keyword arguments are processed sequentially, with later
-    arguments taking precedence.
+    parameters from the given positional and keyword arguments. Positional
+    arguments must be mappings (such as `QueryDict` or `dict`), and
+    `request.GET` is used as the starting point if `args` is empty.
+
+    Keyword arguments are treated as an extra, final mapping. These mappings
+    are processed sequentially, with later arguments taking precedence.
 
     A query string prefixed with `?` is returned.
 
+    Raise TemplateSyntaxError if a positional argument is not a mapping or if
+    keys are not strings.
+
     For example::
 
         {# Set a parameter on top of `request.GET` #}
@@ -1197,18 +1204,31 @@ def querystring(context, query_dict=None, **kwargs):
 
         {# Use a custom ``QueryDict`` #}
         {% querystring my_query_dict foo=3 %}
+
+        {# Use multiple positional and keyword arguments #}
+        {% querystring my_query_dict my_dict foo=3 bar=None %}
     """
-    if query_dict is None:
-        query_dict = context.request.GET
-    params = query_dict.copy()
-    for key, value in kwargs.items():
-        if value is None:
-            if key in params:
-                del params[key]
-        elif isinstance(value, Iterable) and not isinstance(value, str):
-            params.setlist(key, value)
-        else:
-            params[key] = value
+    if not args:
+        args = [context.request.GET]
+    params = QueryDict(mutable=True)
+    for d in [*args, kwargs]:
+        if not isinstance(d, Mapping):
+            raise TemplateSyntaxError(
+                "querystring requires mappings for positional arguments (got "
+                "%r instead)." % d
+            )
+        for key, value in d.items():
+            if not isinstance(key, str):
+                raise TemplateSyntaxError(
+                    "querystring requires strings for mapping keys (got %r "
+                    "instead)." % key
+                )
+            if value is None:
+                params.pop(key, None)
+            elif isinstance(value, Iterable) and not isinstance(value, str):
+                params.setlist(key, value)
+            else:
+                params[key] = value
     query_string = params.urlencode() if params else ""
     return f"?{query_string}"
 

docs/ref/templates/builtins.txt

@@ -964,8 +964,14 @@ output (as a string) inside a variable. This is useful if you want to use
 
 Outputs a URL-encoded formatted query string based on the provided parameters.
 
-This tag requires a :class:`~django.http.QueryDict` instance, which defaults to
-:attr:`request.GET <django.http.HttpRequest.GET>` if none is provided.
+This tag accepts positional arguments, which must be mappings (such as
+:class:`~django.http.QueryDict` or :class:`dict`). If no positional arguments
+are provided, :attr:`request.GET <django.http.HttpRequest.GET>` is used as the
+default to construct the query string.
+
+Positional arguments are processed sequentially, while keyword arguments are
+treated as key-value pairs, applied last. Later arguments take precedence over
+earlier ones, ensuring the most recent pairs are reflected in the final result.
 
 The result always includes a leading ``"?"`` since this tag is mainly used for
 links, and an empty result could prevent the page from reloading as expected.
@@ -1033,16 +1039,33 @@ Handling lists
 If ``my_list`` is ``["red", "blue"]``, the output will be
 ``?color=red&color=blue``, preserving the list structure in the query string.
 
-Custom QueryDict
-~~~~~~~~~~~~~~~~
+Customizing the base QueryDict
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+You can pass custom ``QueryDict`` or ``dict`` instances as positional arguments
+to replace ``request.GET``. When multiple arguments are provided, key-value
+pairs from later arguments take precedence over earlier ones.
+
+For example, if ``my_query_dict`` is ``<QueryDict: {'color': ['blue'], 'size':
+['S']}>`` and ``my_dict`` is ``{'color': 'orange', 'fabric': 'silk', 'type':
+'dress'}``, this outputs ``?color=orange&size=S&fabric=silk``.
 
 .. code-block:: html+django
 
-    {% querystring my_query_dict %}
+    {% querystring my_query_dict my_dict size="S" type=None %}
 
-You can provide a custom ``QueryDict`` to be used instead of ``request.GET``.
-So if ``my_query_dict`` is ``<QueryDict: {'color': ['blue']}>``, this outputs
-``?color=blue``. If ``my_query_dict`` is empty, the output will be ``?``.
+If all keys are removed by setting them to ``None``, this outputs ``?``:
+
+.. code-block:: html+django
+
+    {% querystring my_query_dict my_dict color=None size=None fabric=None type=None %}
+
+Similarly, if all positional arguments are empty and keyword arguments do not
+contribute any new params, the output will also be ``?``.
+
+.. versionchanged:: 6.0
+
+    Support for multiple positional mapping arguments was added.
 
 Dynamic usage
 ~~~~~~~~~~~~~

docs/releases/6.0.txt

@@ -236,6 +236,10 @@ Templates
 * The :ttag:`querystring` template tag now consistently prefixes the returned
   query string with a ``?``, ensuring reliable link generation behavior.
 
+* The :ttag:`querystring` template tag now accepts multiple positional
+  arguments, which must be mappings, such as :class:`~django.http.QueryDict`
+  or :class:`dict`.
+
 Tests
 ~~~~~
 

tests/template_tests/syntax_tests/test_querystring.py

@@ -1,5 +1,6 @@
 from django.http import QueryDict
 from django.template import RequestContext
+from django.template.base import TemplateSyntaxError
 from django.test import RequestFactory, SimpleTestCase
 
 from ..utils import setup
@@ -13,6 +14,10 @@ class QueryStringTagTests(SimpleTestCase):
         output = self.engine.render_to_string(template_name, context)
         self.assertEqual(output, expected)
 
+    def assertTemplateSyntaxError(self, template_name, context, expected):
+        with self.assertRaisesMessage(TemplateSyntaxError, expected):
+            self.engine.render_to_string(template_name, context)
+
     @setup({"querystring_empty_get_params": "{% querystring %}"})
     def test_querystring_empty_get_params(self):
         context = RequestContext(self.request_factory.get("/"))
@@ -26,6 +31,19 @@ class QueryStringTagTests(SimpleTestCase):
             with self.subTest(context=context):
                 self.assertRenderEqual("querystring_remove_all_params", context, "?")
 
+    @setup(
+        {
+            "querystring_remove_all_params_custom_querydict": (
+                "{% querystring my_query_dict my_dict a=None %}"
+            )
+        }
+    )
+    def test_querystring_remove_all_params_custom_querydict(self):
+        context = {"my_query_dict": QueryDict("a=1&b=2"), "my_dict": {"b": None}}
+        self.assertRenderEqual(
+            "querystring_remove_all_params_custom_querydict", context, "?"
+        )
+
     @setup({"querystring_non_empty_get_params": "{% querystring %}"})
     def test_querystring_non_empty_get_params(self):
         request = self.request_factory.get("/", {"a": "b"})
@@ -42,7 +60,7 @@ class QueryStringTagTests(SimpleTestCase):
 
     @setup({"querystring_empty_params": "{% querystring qd %}"})
     def test_querystring_empty_params(self):
-        cases = [None, {}, QueryDict()]
+        cases = [{}, QueryDict()]
         request = self.request_factory.get("/")
         qs = "?a=b"
         request_with_qs = self.request_factory.get(f"/{qs}")
@@ -87,6 +105,82 @@ class QueryStringTagTests(SimpleTestCase):
             "querystring_remove_nonexistent", context, expected="?x=y&a=1"
         )
 
+    @setup({"querystring_remove_dict": "{% querystring my_dict a=1 %}"})
+    def test_querystring_remove_from_dict(self):
+        request = self.request_factory.get("/", {"test": "value"})
+        context = RequestContext(request, {"my_dict": {"test": None}})
+        self.assertRenderEqual("querystring_remove_dict", context, expected="?a=1")
+
+    @setup({"querystring_variable": "{% querystring a=a %}"})
+    def test_querystring_variable(self):
+        request = self.request_factory.get("/")
+        context = RequestContext(request, {"a": 1})
+        self.assertRenderEqual("querystring_variable", context, expected="?a=1")
+
+    @setup({"querystring_dict": "{% querystring my_dict %}"})
+    def test_querystring_dict(self):
+        context = {"my_dict": {"a": 1}}
+        self.assertRenderEqual("querystring_dict", context, expected="?a=1")
+
+    @setup({"querystring_dict_list": "{% querystring my_dict %}"})
+    def test_querystring_dict_list_values(self):
+        context = {"my_dict": {"a": [1, 2]}}
+        self.assertRenderEqual(
+            "querystring_dict_list", context, expected="?a=1&a=2"
+        )
+
+    @setup(
+        {
+            "querystring_multiple_args_override": (
+                "{% querystring my_dict my_query_dict x=3 y=None %}"
+            )
+        }
+    )
+    def test_querystring_multiple_args_override(self):
+        context = {"my_dict": {"x": 0, "y": 42}, "my_query_dict": QueryDict("a=1&b=2")}
+        self.assertRenderEqual(
+            "querystring_multiple_args_override",
+            context,
+            expected="?x=3&a=1&b=2",
+        )
+
+    @setup({"querystring_request_get_ignored": "{% querystring my_mapping %}"})
+    def test_querystring_request_get_ignored(self):
+        cases = [({"y": "x"}, "?y=x"), ({}, "?")]
+        request = self.request_factory.get("/", {"x": "y", "a": "b"})
+        for param, expected in cases:
+            with self.subTest(param=param):
+                context = RequestContext(request, {"my_mapping": param})
+                self.assertRenderEqual(
+                    "querystring_request_get_ignored", context, expected=expected
+                )
+
+    @setup({"querystring_same_arg": "{% querystring a=1 a=2 %}"})
+    def test_querystring_same_arg(self):
+        msg = "'querystring' received multiple values for keyword argument 'a'"
+        self.assertTemplateSyntaxError("querystring_same_arg", {}, msg)
+
+    @setup({"querystring_non_mapping_args": "{% querystring somevar %}"})
+    def test_querystring_non_mapping_args(self):
+        cases = [None, 0, "", []]
+        request = self.request_factory.get("/")
+        msg = (
+            "querystring requires mappings for positional arguments (got %r "
+            "instead)."
+        )
+        for param in cases:
+            with self.subTest(param=param):
+                context = RequestContext(request, {"somevar": param})
+                self.assertTemplateSyntaxError(
+                    "querystring_non_mapping_args", context, msg % param
+                )
+
+    @setup({"querystring_non_string_dict_keys": "{% querystring my_dict %}"})
+    def test_querystring_non_string_dict_keys(self):
+        context = {"my_dict": {0: 1}}
+        msg = "querystring requires strings for mapping keys (got 0 instead)."
+        self.assertTemplateSyntaxError("querystring_non_string_dict_keys", context, msg)
+
     @setup({"querystring_list": "{% querystring a=my_list %}"})
     def test_querystring_add_list(self):
         request = self.request_factory.get("/")