[FIX] survey_record_generation allow negative value in boolean question

survey_record_generation/models/survey_user_input.py

@@ -315,25 +315,41 @@ class SurveyUserInput(models.Model):
                 }
             )
 
-    @staticmethod
-    def get_boolean_value(answer_value_char: str, question_title: str) -> bool:
-        # Below code is a trick to be able to use "simple_choice" question
-        # with values 'yes' and 'no' and transform it to boolean.
-        if boolean_value := answer_value_char in [
-            "1",
-            "True",
-            "true",
-            "Oui",
-            "oui",
-            "Yes",
-            "yes",
-        ]:
-            return boolean_value
-        else:
+
+    def _get_boolean_true_values(self):
+        """Tokens interpreted as true, normalized to lowercase.
+
+        Instance method so that a third-party module or a localization can
+        extend the list without rewriting get_boolean_value.
+        """
+        return {"1", "true", "vrai", "yes", "y", "oui", "o", "on", "x"}
+
+    def _get_boolean_false_values(self):
+        """Tokens interpreted as false, normalized to lowercase."""
+        return {"0", "false", "faux", "no", "n", "non", "off", ""}
+
+    def get_boolean_value(self, answer_value_char: str, question_title: str) -> bool:
+        """Convert the technical value of an answer into a boolean.
+
+        Allows a boolean field to be filled from a "simple_choice" question
+        whose suggested answers carry yes/no values.
+        """
+        if not answer_value_char:
+            # Empty answer: an unset boolean is false, this is not a
+            # configuration error.
+            return False
+
+        token = str(answer_value_char).strip().casefold()
+
+        if token in self._get_boolean_true_values():
+            return True
+        if token in self._get_boolean_false_values():
+            return False
+
         raise UserError(
             _(
-                    "[Survey record generation] The boolean value %s(value)s "
-                    "is not supported (for question %(question)s)."
+                "[Survey record generation] The boolean value %(value)s is not "
+                "supported (for question %(question)s)"
             )
             % {
                 "value": answer_value_char,