feat: implement flat_answer_map (analog to ember-caluma)

caluma/caluma_form/models.py

@@ -334,6 +334,40 @@ class Document(core_models.UUIDModel):
     )
     meta = models.JSONField(default=dict)
 
+    def flat_answer_map(self):
+        """
+        Return a dictionary with the flattened answer map for this document.
+
+        The keys are the question IDs, and the values are either the answer value
+        or date for non-table questions, or a list of flattened answer maps for
+        table questions.
+
+        Example usage:
+        >>> doc = Document.objects.get(pk=1)
+        >>> flat_map = doc.flat_answer_map()
+        >>> print(flat_map)
+        {
+            "first-name": 'John',
+            "second-name": 'Doe',
+            "email-in-subform": 'john.doe@example.com',
+            "projects": [
+                {"title": 'Project A', "date": '2022-01-01'},
+                {"title": 'Project B', "date": '2022-02-01'},
+                {"title": 'Project C', "date": '2022-03-01'}
+            ]
+        }
+        """
+        answers = {}
+        for answer in self.answers.all():
+            if answer.question.type == Question.TYPE_TABLE:
+                answers[answer.question_id] = [
+                    answer.flat_answer_map() for answer in answer.documents.all()
+                ]
+            else:
+                answers[answer.question_id] = answer.value or answer.date
+
+        return answers
+
     def set_family(self, root_doc):
         """Set the family to the given root_doc.
 

caluma/caluma_form/tests/test_document.py

@@ -1714,3 +1714,17 @@ def test_selected_options(
         )
 
     assert returned_value == expected_values
+
+
+def test_flat_answer_map(db, form_and_document):
+    (_form, document, _questions_dict, answers_dict) = form_and_document(
+        use_table=True, use_subform=True
+    )
+
+    flat_answer_map = document.flat_answer_map()
+
+    assert flat_answer_map["top_question"] == answers_dict["top_question"].value
+    assert flat_answer_map["sub_question"] == answers_dict["sub_question"].value
+    assert flat_answer_map["table"] == [
+        {"column": answers_dict["table"].documents.first().answers.first().value}
+    ]