Add mapping name as mapping source in importer

spinedb_api/import_mapping/generator.py

@@ -57,6 +57,7 @@ def get_mapped_data(
     default_column_convert_fn=None,
     row_convert_fns=None,
     unparse_value=identity,
+    mapping_names=[],
 ):
     """
     Args:
@@ -68,6 +69,7 @@ def get_mapped_data(
         default_column_convert_fn (Callable, optional): default convert function for surplus columns
         row_convert_fns (dict(int,function), optional): mapping from row number to convert function
         unparse_value (Callable): a callable that converts values to database format
+        mapping_names (list, optional): list of mapping names (order corresponds to order of mappings).
 
     Returns:
         dict: Mapped data, ready for ``import_data()``
@@ -91,10 +93,11 @@ def get_mapped_data(
         row_convert_fns = {}
     if default_column_convert_fn is None:
         default_column_convert_fn = column_convert_fns[max(column_convert_fns)] if column_convert_fns else identity
-    for mapping in mappings:
+    _ensure_mapping_name_consistency(mappings, mapping_names)
+    for mapping, mapping_name in zip(mappings, mapping_names):
         read_state = {}
         mapping = deepcopy(mapping)
-        mapping.polish(table_name, data_header, column_count)
+        mapping.polish(table_name, data_header, mapping_name, column_count)
         mapping_errors = check_validity(mapping)
         if mapping_errors:
             errors += mapping_errors
@@ -417,3 +420,18 @@ def _apply_index_names(map_, index_names):
     for v in map_.values:
         if isinstance(v, Map):
             _apply_index_names(v, index_names[1:])
+
+
+def _ensure_mapping_name_consistency(mappings, mapping_names):
+    """Makes sure that there are as many mapping names as actual mappings.
+
+    Args:
+        mappings (list(ImportMapping)): list of mappings
+        mapping_names (list(str)): list of mapping names
+    """
+    n_mappings = len(mappings)
+    n_mapping_names = len(mapping_names)
+    if n_mapping_names > n_mappings:
+        mapping_names = mapping_names[:n_mappings]
+    elif n_mapping_names < n_mappings:
+        mapping_names += [""] * (n_mappings - n_mapping_names)

spinedb_api/import_mapping/import_mapping.py

@@ -156,28 +156,29 @@ def check_for_invalid_column_refs(self, header, table_name):
             return msg
         return ""
 
-    def polish(self, table_name, source_header, column_count=0, for_preview=False):
+    def polish(self, table_name, source_header, mapping_name, column_count=0, for_preview=False):
         """Polishes the mapping before an import operation.
         'Expands' transient ``position`` and ``value`` attributes into their final value.
 
         Args:
             table_name (str)
             source_header (list(str))
+            mapping_name (str)
             column_count (int, optional)
             for_preview (bool, optional)
         """
-        self._polish_for_import(table_name, source_header, column_count)
+        self._polish_for_import(table_name, source_header, mapping_name, column_count)
         if for_preview:
             self._polish_for_preview(source_header)
 
-    def _polish_for_import(self, table_name, source_header, column_count, pivoted=None):
+    def _polish_for_import(self, table_name, source_header, mapping_name, column_count, pivoted=None):
         # FIXME: Polish skip columns
         if pivoted is None:
             pivoted = self.is_pivoted()
         if pivoted and self.parent and self.is_effective_leaf():
             return
         if self.child is not None:
-            self.child._polish_for_import(table_name, source_header, column_count, pivoted)
+            self.child._polish_for_import(table_name, source_header, mapping_name, column_count, pivoted)
         if isinstance(self.position, str):
             # Column mapping with string position, we need to find the index in the header
             try:
@@ -190,6 +191,10 @@ def _polish_for_import(self, table_name, source_header, column_count, pivoted=No
             # Table name mapping, we set the fixed value to the table name
             self.value = table_name
             return
+        if self.position == Position.mapping_name:
+            # Mapping name mapping, we set the fixed value to the mapping name
+            self.value = mapping_name
+            return
         if self.position == Position.header:
             if self.value is None:
                 # Row mapping from header, we handle this one separately

spinedb_api/mapping.py

@@ -24,6 +24,7 @@ class Position(Enum):
     hidden = "hidden"
     table_name = "table_name"
     header = "header"
+    mapping_name = "mapping_name"
 
 
 def is_pivoted(position):

spinedb_api/spine_io/importers/reader.py

@@ -139,9 +139,11 @@ def get_mapped_data(
             table_max_rows = self._resolve_max_rows(options, max_rows)
             data_source, header = self.get_data_iterator(table, options, table_max_rows)
             mappings = []
+            mapping_names = []
             for named_mapping_spec in named_mapping_specs:
-                _, mapping = parse_named_mapping_spec(named_mapping_spec)
+                name, mapping = parse_named_mapping_spec(named_mapping_spec)
                 mappings.append(mapping)
+                mapping_names.append(name)
             try:
                 data, t_errors = get_mapped_data(
                     data_source,
@@ -152,6 +154,7 @@ def get_mapped_data(
                     default_column_convert_fn,
                     row_convert_fns,
                     unparse_value,
+                    mapping_names,
                 )
             except (ConnectorError, ParameterValueFormatError, InvalidMappingComponent) as error:
                 errors.append(str(error))

tests/import_mapping/test_generator.py

@@ -724,6 +724,48 @@ def test_import_durations(self):
             },
         )
 
+    def test_import_with_one_mapping_name_for_two_mappings(self):
+        data_source = iter([["other_name"]])
+        mappings = [
+            [
+                {"map_type": "Alternative", "position": "mapping_name"},
+            ],
+            [
+                {"map_type": "Alternative", "position": 0},
+            ],
+        ]
+        convert_function_specs = {0: "string"}
+        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, column_convert_fns=convert_functions, mapping_names=["some_name"]
+        )
+        self.assertEqual(errors, [])
+        self.assertEqual(
+            mapped_data,
+            {"alternatives": {"some_name", "other_name"}},
+        )
+
+    def test_import_with_mapping_name_with_too_many_mapping_names(self):
+        data_source = iter([["other_name"]])
+        mappings = [
+            [
+                {"map_type": "Alternative", "position": "mapping_name"},
+            ],
+            [
+                {"map_type": "Alternative", "position": 0},
+            ],
+        ]
+        convert_function_specs = {0: "string"}
+        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, column_convert_fns=convert_functions, mapping_names=["some_name", "other", "null"]
+        )
+        self.assertEqual(errors, [])
+        self.assertEqual(
+            mapped_data,
+            {"alternatives": {"some_name", "other_name"}},
+        )
+
 
 if __name__ == "__main__":
     unittest.main()

tests/import_mapping/test_import_mapping.py

@@ -121,39 +121,39 @@ def test_polish_null_mapping(self):
         mapping = ImportMapping(Position.hidden, value=None)
         table_name = "tablename"
         header = ["A", "B", "C"]
-        mapping.polish(table_name, header)
+        mapping.polish(table_name, header, "")
         self.assertEqual(mapping.position, Position.hidden)
         self.assertIsNone(mapping.value)
 
     def test_polish_column_mapping(self):
         mapping = ImportMapping("B", value=None)
         table_name = "tablename"
         header = ["A", "B", "C"]
-        mapping.polish(table_name, header)
+        mapping.polish(table_name, header, "")
         self.assertEqual(mapping.position, 1)
         self.assertIsNone(mapping.value)
 
     def test_polish_column_header_mapping(self):
         mapping = ImportMapping(Position.header, value=2)
         table_name = "tablename"
         header = ["A", "B", "C"]
-        mapping.polish(table_name, header)
+        mapping.polish(table_name, header, "")
         self.assertEqual(mapping.position, Position.header)
         self.assertEqual(mapping.value, "C")
 
     def test_polish_column_header_mapping_str(self):
         mapping = ImportMapping(Position.header, value="2")
         table_name = "tablename"
         header = ["A", "B", "C"]
-        mapping.polish(table_name, header)
+        mapping.polish(table_name, header, "")
         self.assertEqual(mapping.position, Position.header)
         self.assertEqual(mapping.value, "C")
 
     def test_polish_column_header_mapping_duplicates(self):
         mapping = ImportMapping(Position.header, value=3)
         table_name = "tablename"
         header = ["A", "B", "C", "A"]
-        mapping.polish(table_name, header, for_preview=True)
+        mapping.polish(table_name, header, "", for_preview=True)
         self.assertEqual(mapping.position, Position.header)
         self.assertEqual(mapping.value, 3)
 
@@ -162,31 +162,40 @@ def test_polish_column_header_mapping_invalid_header(self):
         table_name = "tablename"
         header = ["A", "B", "C"]
         with self.assertRaises(InvalidMapping):
-            mapping.polish(table_name, header)
+            mapping.polish(table_name, header, "")
 
     def test_polish_column_header_mapping_invalid_index(self):
         mapping = ImportMapping(Position.header, value=4)
         table_name = "tablename"
         header = ["A", "B", "C"]
         with self.assertRaises(InvalidMapping):
-            mapping.polish(table_name, header)
+            mapping.polish(table_name, header, "")
 
     def test_polish_table_name_mapping(self):
         mapping = ImportMapping(Position.table_name)
         table_name = "tablename"
         header = ["A", "B", "C"]
-        mapping.polish(table_name, header)
+        mapping.polish(table_name, header, "")
         self.assertEqual(mapping.position, Position.table_name)
         self.assertEqual(mapping.value, "tablename")
 
     def test_polish_row_header_mapping(self):
         mapping = ImportMapping(Position.header, value=None)
         table_name = "tablename"
         header = ["A", "B", "C"]
-        mapping.polish(table_name, header)
+        mapping.polish(table_name, header, "")
         self.assertEqual(mapping.position, Position.header)
         self.assertIsNone(mapping.value)
 
+    def test_polish_mapping_name_mapping(self):
+        mapping = ImportMapping(Position.mapping_name)
+        table_name = "tablename"
+        mapping_name = "some_mapping_name"
+        header = ["A", "B", "C"]
+        mapping.polish(table_name, header, mapping_name)
+        self.assertEqual(mapping.position, Position.mapping_name)
+        self.assertEqual(mapping.value, "some_mapping_name")
+
 
 class TestImportMappingIO(unittest.TestCase):
     def test_object_class_mapping(self):