Fixed #27370 -- Prevented Select widget from using 'required' with a non-empty first value.

4 files changed, 45 insertions, 25 deletions

diff --git a/tests/forms_tests/field_tests/test_choicefield.py b/tests/forms_tests/field_tests/test_choicefield.py
index 4c70177dac..1d8fe5a3cf 100644
--- a/tests/forms_tests/field_tests/test_choicefield.py
+++ b/tests/forms_tests/field_tests/test_choicefield.py
@@ -82,7 +82,7 @@ class ChoiceFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
         f = ChoiceField(choices=[('J', 'John'), ('P', 'Paul')], disabled=True)
         self.assertWidgetRendersTo(
             f,
-            '<select id="id_f" name="f" disabled required><option value="J">John</option>'
+            '<select id="id_f" name="f" disabled><option value="J">John</option>'
             '<option value="P">Paul</option></select>'
         )
 
diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index 4079be1235..2b93575bf2 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -502,12 +502,12 @@ class FormsTestCase(SimpleTestCase):
             language = ChoiceField(choices=[('P', 'Python'), ('J', 'Java')])
 
         f = FrameworkForm(auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select name="language">
 <option value="P">Python</option>
 <option value="J">Java</option>
 </select>""")
         f = FrameworkForm({'name': 'Django', 'language': 'P'}, auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select name="language">
 <option value="P" selected>Python</option>
 <option value="J">Java</option>
 </select>""")
@@ -531,12 +531,12 @@ class FormsTestCase(SimpleTestCase):
             language = ChoiceField(choices=[('P', 'Python'), ('J', 'Java')], widget=Select(attrs={'class': 'foo'}))
 
         f = FrameworkForm(auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language">
 <option value="P">Python</option>
 <option value="J">Java</option>
 </select>""")
         f = FrameworkForm({'name': 'Django', 'language': 'P'}, auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language">
 <option value="P" selected>Python</option>
 <option value="J">Java</option>
 </select>""")
@@ -552,12 +552,12 @@ class FormsTestCase(SimpleTestCase):
             )
 
         f = FrameworkForm(auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language">
 <option value="P">Python</option>
 <option value="J">Java</option>
 </select>""")
         f = FrameworkForm({'name': 'Django', 'language': 'P'}, auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select class="foo" name="language">
 <option value="P" selected>Python</option>
 <option value="J">Java</option>
 </select>""")
@@ -568,10 +568,10 @@ class FormsTestCase(SimpleTestCase):
             language = ChoiceField()
 
         f = FrameworkForm(auto_id=False)
-        self.assertHTMLEqual(str(f['language']), """<select name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select name="language">
 </select>""")
         f.fields['language'].choices = [('P', 'Python'), ('J', 'Java')]
-        self.assertHTMLEqual(str(f['language']), """<select name="language" required>
+        self.assertHTMLEqual(str(f['language']), """<select name="language">
 <option value="P">Python</option>
 <option value="J">Java</option>
 </select>""")
@@ -2363,37 +2363,37 @@ Password: <input type="password" name="password" required />
             is_cool = NullBooleanField()
 
         p = Person({'name': 'Joe'}, auto_id=False)
-        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool" required>
+        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool">
 <option value="1" selected>Unknown</option>
 <option value="2">Yes</option>
 <option value="3">No</option>
 </select>""")
         p = Person({'name': 'Joe', 'is_cool': '1'}, auto_id=False)
-        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool" required>
+        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool">
 <option value="1" selected>Unknown</option>
 <option value="2">Yes</option>
 <option value="3">No</option>
 </select>""")
         p = Person({'name': 'Joe', 'is_cool': '2'}, auto_id=False)
-        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool" required>
+        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool">
 <option value="1">Unknown</option>
 <option value="2" selected>Yes</option>
 <option value="3">No</option>
 </select>""")
         p = Person({'name': 'Joe', 'is_cool': '3'}, auto_id=False)
-        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool" required>
+        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool">
 <option value="1">Unknown</option>
 <option value="2">Yes</option>
 <option value="3" selected>No</option>
 </select>""")
         p = Person({'name': 'Joe', 'is_cool': True}, auto_id=False)
-        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool" required>
+        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool">
 <option value="1">Unknown</option>
 <option value="2" selected>Yes</option>
 <option value="3">No</option>
 </select>""")
         p = Person({'name': 'Joe', 'is_cool': False}, auto_id=False)
-        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool" required>
+        self.assertHTMLEqual(str(p['is_cool']), """<select name="is_cool">
 <option value="1">Unknown</option>
 <option value="2">Yes</option>
 <option value="3" selected>No</option>
@@ -2759,7 +2759,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
             """<li class="required error"><ul class="errorlist"><li>This field is required.</li></ul>
 <label class="required" for="id_name">Name:</label> <input type="text" name="name" id="id_name" required /></li>
 <li class="required"><label class="required" for="id_is_cool">Is cool:</label>
-<select name="is_cool" id="id_is_cool" required>
+<select name="is_cool" id="id_is_cool">
 <option value="1" selected>Unknown</option>
 <option value="2">Yes</option>
 <option value="3">No</option>
@@ -2775,7 +2775,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
 <p class="required error"><label class="required" for="id_name">Name:</label>
 <input type="text" name="name" id="id_name" required /></p>
 <p class="required"><label class="required" for="id_is_cool">Is cool:</label>
-<select name="is_cool" id="id_is_cool" required>
+<select name="is_cool" id="id_is_cool">
 <option value="1" selected>Unknown</option>
 <option value="2">Yes</option>
 <option value="3">No</option>
@@ -2793,7 +2793,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
 <td><ul class="errorlist"><li>This field is required.</li></ul>
 <input type="text" name="name" id="id_name" required /></td></tr>
 <tr class="required"><th><label class="required" for="id_is_cool">Is cool:</label></th>
-<td><select name="is_cool" id="id_is_cool" required>
+<td><select name="is_cool" id="id_is_cool">
 <option value="1" selected>Unknown</option>
 <option value="2">Yes</option>
 <option value="3">No</option>
@@ -3516,7 +3516,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
             '<p><label for="id_f2">F2:</label> <input id="id_f2" maxlength="30" name="f2" type="text" /></p>'
             '<p><label for="id_f3">F3:</label> <textarea cols="40" id="id_f3" name="f3" rows="10" required>'
             '</textarea></p>'
-            '<p><label for="id_f4">F4:</label> <select id="id_f4" name="f4" required>'
+            '<p><label for="id_f4">F4:</label> <select id="id_f4" name="f4">'
             '<option value="P">Python</option>'
             '<option value="J">Java</option>'
             '</select></p>',
@@ -3528,7 +3528,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
             '<li><label for="id_f2">F2:</label> <input id="id_f2" maxlength="30" name="f2" type="text" /></li>'
             '<li><label for="id_f3">F3:</label> <textarea cols="40" id="id_f3" name="f3" rows="10" required>'
             '</textarea></li>'
-            '<li><label for="id_f4">F4:</label> <select id="id_f4" name="f4" required>'
+            '<li><label for="id_f4">F4:</label> <select id="id_f4" name="f4">'
             '<option value="P">Python</option>'
             '<option value="J">Java</option>'
             '</select></li>',
@@ -3542,7 +3542,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
             '<tr><th><label for="id_f3">F3:</label></th>'
             '<td><textarea cols="40" id="id_f3" name="f3" rows="10" required>'
             '</textarea></td></tr>'
-            '<tr><th><label for="id_f4">F4:</label></th><td><select id="id_f4" name="f4" required>'
+            '<tr><th><label for="id_f4">F4:</label></th><td><select id="id_f4" name="f4">'
             '<option value="P">Python</option>'
             '<option value="J">Java</option>'
             '</select></td></tr>',
diff --git a/tests/forms_tests/tests/tests.py b/tests/forms_tests/tests/tests.py
index c19d1a66cd..f0007fbe8f 100644
--- a/tests/forms_tests/tests/tests.py
+++ b/tests/forms_tests/tests/tests.py
@@ -109,12 +109,12 @@ class ModelFormCallableModelDefault(TestCase):
         ChoiceOptionModel.objects.create(id=3, name='option 3')
         self.assertHTMLEqual(
             ChoiceFieldForm().as_p(),
-            """<p><label for="id_choice">Choice:</label> <select name="choice" id="id_choice" required>
+            """<p><label for="id_choice">Choice:</label> <select name="choice" id="id_choice">
 <option value="1" selected>ChoiceOption 1</option>
 <option value="2">ChoiceOption 2</option>
 <option value="3">ChoiceOption 3</option>
 </select><input type="hidden" name="initial-choice" value="1" id="initial-id_choice" /></p>
-<p><label for="id_choice_int">Choice int:</label> <select name="choice_int" id="id_choice_int" required>
+<p><label for="id_choice_int">Choice int:</label> <select name="choice_int" id="id_choice_int">
 <option value="1" selected>ChoiceOption 1</option>
 <option value="2">ChoiceOption 2</option>
 <option value="3">ChoiceOption 3</option>
@@ -145,12 +145,12 @@ class ModelFormCallableModelDefault(TestCase):
                 'multi_choice': [obj2, obj3],
                 'multi_choice_int': ChoiceOptionModel.objects.exclude(name="default"),
             }).as_p(),
-            """<p><label for="id_choice">Choice:</label> <select name="choice" id="id_choice" required>
+            """<p><label for="id_choice">Choice:</label> <select name="choice" id="id_choice">
 <option value="1">ChoiceOption 1</option>
 <option value="2" selected>ChoiceOption 2</option>
 <option value="3">ChoiceOption 3</option>
 </select><input type="hidden" name="initial-choice" value="2" id="initial-id_choice" /></p>
-<p><label for="id_choice_int">Choice int:</label> <select name="choice_int" id="id_choice_int" required>
+<p><label for="id_choice_int">Choice int:</label> <select name="choice_int" id="id_choice_int">
 <option value="1">ChoiceOption 1</option>
 <option value="2" selected>ChoiceOption 2</option>
 <option value="3">ChoiceOption 3</option>
diff --git a/tests/forms_tests/widget_tests/test_select.py b/tests/forms_tests/widget_tests/test_select.py
index 4b717b6043..d2660ea787 100644
--- a/tests/forms_tests/widget_tests/test_select.py
+++ b/tests/forms_tests/widget_tests/test_select.py
@@ -294,3 +294,23 @@ class SelectTest(WidgetTest):
         self.assertIsNot(widget.choices, obj.choices)
         self.assertEqual(widget.attrs, obj.attrs)
         self.assertIsNot(widget.attrs, obj.attrs)
+
+    def test_doesnt_render_required_when_impossible_to_select_empty_field(self):
+        widget = self.widget(choices=[('J', 'John'), ('P', 'Paul')])
+        self.assertIs(widget.use_required_attribute(initial=None), False)
+
+    def test_renders_required_when_possible_to_select_empty_field_str(self):
+        widget = self.widget(choices=[('', 'select please'), ('P', 'Paul')])
+        self.assertIs(widget.use_required_attribute(initial=None), True)
+
+    def test_renders_required_when_possible_to_select_empty_field_list(self):
+        widget = self.widget(choices=[['', 'select please'], ['P', 'Paul']])
+        self.assertIs(widget.use_required_attribute(initial=None), True)
+
+    def test_renders_required_when_possible_to_select_empty_field_none(self):
+        widget = self.widget(choices=[(None, 'select please'), ('P', 'Paul')])
+        self.assertIs(widget.use_required_attribute(initial=None), True)
+
+    def test_doesnt_render_required_when_no_choices_are_available(self):
+        widget = self.widget(choices=[])
+        self.assertIs(widget.use_required_attribute(initial=None), False)