Backported #598

CHANGES.rst

@@ -1,6 +1,13 @@
 .. currentmodule:: wtforms
 
 
+Unreleased
+----------
+
+-   Fixed a bug with :class:`~fields.SelectField` choices shortcut at
+    form submission. :pr:`598, 639`
+
+
 Version 2.3.1
 -------------
 

tests/fields.py

@@ -342,6 +342,13 @@ def test_choice_shortcut(self):
         form = F(a="bar")
         self.assertEqual(form.a(), """<select id="a" name="a"><option value="foo">foo</option><option selected value="bar">bar</option></select>""")
 
+    def test_choice_shortcut_post(self):
+        F = make_form(a=SelectField(choices=["foo", "bar"]))
+        form = F(DummyPostData(a=["foo"]))
+        assert form.validate()
+        assert form.a.data == "foo"
+        assert len(form.a.errors) == 0
+
     def test_empty_choice(self):
         F = make_form(a=SelectField(choices=[], validate_choice=False))
         form = F(a="bar")

wtforms/fields/core.py

@@ -506,8 +506,8 @@ def process_formdata(self, valuelist):
 
     def pre_validate(self, form):
         if self.validate_choice:
-            for v, _ in self.choices:
-                if self.data == v:
+            for _, _, match in self.iter_choices():
+                if match:
                     break
             else:
                 raise ValueError(self.gettext("Not a valid choice"))