Treat pivoted leaf import mapping correctly even when its position is set to header

spinedb_api/import_mapping/generator.py

@@ -199,7 +199,7 @@ def _split_mapping(mapping):
     non_pivoted = []
     pivoted_from_header = []
     for m in flattened:
-        if pivoted and m is flattened[-1]:
+        if (pivoted or pivoted_from_header) and m is flattened[-1]:
             # If any other mapping is pivoted, ignore last mapping's position
             break
         if m.position == Position.header and m.value is None:

spinedb_api/import_mapping/import_mapping.py

@@ -48,6 +48,7 @@ class ImportKey(Enum):
 
     def __str__(self):
         name = {
+            self.ALTERNATIVE_NAME.value: "Alternative names",
             self.CLASS_NAME.value: "Class names",
             self.OBJECT_CLASS_NAME.value: "Object class names",
             self.OBJECT_NAME.value: "Object names",
@@ -279,7 +280,7 @@ def is_constant(self):
     def is_pivoted(self):
         if is_pivoted(self.position):
             return True
-        if self.position == Position.header and self.value is None:
+        if self.position == Position.header and self.value is None and self.child is not None:
             return True
         if self.child is None:
             return False

tests/import_mapping/test_generator.py

@@ -398,6 +398,43 @@ def test_arrays_get_imported_correctly_when_objects_are_in_header_and_alternativ
             },
         )
 
+    def test_header_position_is_ignored_in_last_mapping_if_other_mappings_are_in_header(self):
+        header = ["Dimension", "parameter1", "parameter2"]
+        data_source = iter([["d1", 1.1, -2.3], ["d2", -1.1, 2.3]])
+        mappings = [
+            [
+                {"map_type": "ObjectClass", "position": "table_name"},
+                {"map_type": "Object", "position": 0},
+                {"map_type": "ObjectMetadata", "position": "hidden"},
+                {"map_type": "ParameterDefinition", "position": "header"},
+                {"map_type": "Alternative", "position": "hidden", "value": "Base"},
+                {"map_type": "ParameterValueMetadata", "position": "hidden"},
+                {"map_type": "ParameterValue", "position": "header"},
+            ]
+        ]
+        convert_function_specs = {0: "string", 1: "float", 2: "float"}
+        convert_functions = {column: value_to_convert_spec(spec) for column, spec in convert_function_specs.items()}
+
+        mapped_data, errors = get_mapped_data(
+            data_source, mappings, header, table_name="Data", column_convert_fns=convert_functions
+        )
+        self.assertEqual(errors, [])
+        self.assertEqual(
+            mapped_data,
+            {
+                "alternatives": {"Base"},
+                "object_classes": {"Data"},
+                "object_parameter_values": [
+                    ["Data", "d1", "parameter1", 1.1, "Base"],
+                    ["Data", "d1", "parameter2", -2.3, "Base"],
+                    ["Data", "d2", "parameter1", -1.1, "Base"],
+                    ["Data", "d2", "parameter2", 2.3, "Base"],
+                ],
+                "object_parameters": [("Data", "parameter1"), ("Data", "parameter2")],
+                "objects": {("Data", "d1"), ("Data", "d2")},
+            },
+        )
+
 
 if __name__ == '__main__':
     unittest.main()

tests/import_mapping/test_import_mapping.py

@@ -26,6 +26,7 @@
     IndexNameMapping,
     ParameterValueIndexMapping,
     ExpandedParameterValueMapping,
+    ParameterValueMapping,
     ParameterValueTypeMapping,
     ParameterDefaultValueTypeMapping,
     DefaultValueIndexNameMapping,
@@ -2096,5 +2097,23 @@ def test_child_mapping_without_filter_doesnt_have_filter(self):
         self.assertFalse(mapping.has_filter())
 
 
+class TestIsPivoted(unittest.TestCase):
+    def test_pivoted_position_returns_true(self):
+        mapping = AlternativeMapping(-1)
+        self.assertTrue(mapping.is_pivoted())
+
+    def test_recursively_returns_false_when_all_mappings_are_non_pivoted(self):
+        mapping = unflatten([AlternativeMapping(0), ParameterValueMapping(1)])
+        self.assertFalse(mapping.is_pivoted())
+
+    def test_returns_true_when_position_is_header_and_has_child(self):
+        mapping = unflatten([AlternativeMapping(Position.header), ParameterValueMapping(0)])
+        self.assertTrue(mapping.is_pivoted())
+
+    def test_returns_false_when_position_is_header_and_is_leaf(self):
+        mapping = unflatten([AlternativeMapping(0), ParameterValueMapping(Position.header)])
+        self.assertFalse(mapping.is_pivoted())
+
+
 if __name__ == "__main__":
     unittest.main()

tests/test_mapping.py

@@ -38,6 +38,15 @@ def test_non_pivoted_columns_when_non_tail_mapping_is_pivoted(self):
         root_mapping = unflatten([Mapping(5), Mapping(Position.hidden), Mapping(-1), Mapping(13), Mapping(23)])
         self.assertEqual(root_mapping.non_pivoted_columns(), [5, 13])
 
+    def test_is_pivoted_returns_true_when_position_is_pivoted(self):
+        mapping = Mapping(-1)
+        self.assertTrue(mapping.is_pivoted())
+
+    def test_is_pivoted_returns_false_when_all_mappings_are_non_pivoted(self):
+        mappings = [Mapping(0), Mapping(1)]
+        root = unflatten(mappings)
+        self.assertFalse(root.is_pivoted())
+
 
 if __name__ == "__main__":
     unittest.main()