Metadata anonymize doesn't produce the right METADATA_SPEC_VERSION

sdv/metadata/metadata.py

@@ -288,3 +288,14 @@ def get_table_metadata(self, table_name=None):
         table_name = self._handle_table_name(table_name)
         table_metadata = super().get_table_metadata(table_name)
         return Metadata.load_from_dict(table_metadata.to_dict(), single_table_name=table_name)
+
+    def anonymize(self):
+        """Anonymize metadata by obfuscating column names.
+
+        Returns:
+            MultiTableMetadata:
+                An anonymized MultiTableMetadata instance.
+        """
+        anonymized_metadata = self._get_anonymized_dict()
+
+        return Metadata.load_from_dict(anonymized_metadata)

sdv/metadata/multi_table.py

@@ -914,13 +914,7 @@ def get_table_metadata(self, table_name):
         self._validate_table_exists(table_name)
         return deepcopy(self.tables[table_name])
 
-    def anonymize(self):
-        """Anonymize metadata by obfuscating column names.
-
-        Returns:
-            MultiTableMetadata:
-                An anonymized MultiTableMetadata instance.
-        """
+    def _get_anonymized_dict(self):
         anonymized_metadata = {'tables': {}, 'relationships': []}
         anonymized_table_map = {}
         counter = 1
@@ -953,6 +947,17 @@ def anonymize(self):
                 'parent_primary_key': anonymized_primary_key,
             })
 
+        return anonymized_metadata
+
+    def anonymize(self):
+        """Anonymize metadata by obfuscating column names.
+
+        Returns:
+            MultiTableMetadata:
+                An anonymized MultiTableMetadata instance.
+        """
+        anonymized_metadata = self._get_anonymized_dict()
+
         return MultiTableMetadata.load_from_dict(anonymized_metadata)
 
     def visualize(

tests/integration/metadata/test_metadata.py

@@ -462,3 +462,61 @@ def test_any_metadata_update_multi_table(method, args, kwargs):
         assert expected_dict != metadata_before
     else:
         assert result == ['checkin_date', 'checkout_date']
+
+
+def test_anonymize():
+    """Test the ``anonymize`` method."""
+    # Setup
+    metadata_dict = {
+        'tables': {
+            'real_table1': {
+                'columns': {
+                    'table1_primary_key': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{3}'},
+                    'table1_column2': {'sdtype': 'categorical'},
+                },
+                'primary_key': 'table1_primary_key',
+            },
+            'real_table2': {
+                'columns': {
+                    'table2_primary_key': {'sdtype': 'email'},
+                    'table2_foreign_key': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{3}'},
+                },
+                'primary_key': 'table2_primary_key',
+            },
+        },
+        'relationships': [
+            {
+                'parent_table_name': 'real_table1',
+                'parent_primary_key': 'table1_primary_key',
+                'child_table_name': 'real_table2',
+                'child_foreign_key': 'table2_foreign_key',
+            }
+        ],
+    }
+    metadata = Metadata.load_from_dict(metadata_dict)
+    table1_metadata = metadata.tables['real_table1']
+    table2_metadata = metadata.tables['real_table2']
+    metadata.validate()
+
+    # Run
+    anonymized = metadata.anonymize()
+
+    # Assert
+    anonymized.validate()
+
+    assert anonymized.METADATA_SPEC_VERSION == 'V1'
+    assert anonymized.tables.keys() == {'table1', 'table2'}
+    assert len(anonymized.relationships) == len(metadata.relationships)
+    assert anonymized.relationships[0]['parent_table_name'] == 'table1'
+    assert anonymized.relationships[0]['child_table_name'] == 'table2'
+    assert anonymized.relationships[0]['parent_primary_key'] == 'col1'
+    assert anonymized.relationships[0]['child_foreign_key'] == 'col2'
+
+    anon_primary_key_metadata = anonymized.tables['table1'].columns['col1']
+    assert anon_primary_key_metadata == table1_metadata.columns['table1_primary_key']
+
+    anon_foreign_key_metadata = anonymized.tables['table2'].columns['col2']
+    assert anon_foreign_key_metadata == table2_metadata.columns['table2_foreign_key']
+
+    assert anonymized.tables['table1'].to_dict() == table1_metadata.anonymize().to_dict()
+    assert anonymized.tables['table2'].to_dict() == table2_metadata.anonymize().to_dict()

tests/integration/metadata/test_multi_table.py

@@ -374,6 +374,7 @@ def test_anonymize():
     # Assert
     anonymized.validate()
 
+    assert anonymized.METADATA_SPEC_VERSION == 'MULTI_TABLE_V1'
     assert anonymized.tables.keys() == {'table1', 'table2'}
     assert len(anonymized.relationships) == len(metadata.relationships)
     assert anonymized.relationships[0]['parent_table_name'] == 'table1'

tests/unit/metadata/test_metadata.py

@@ -717,3 +717,18 @@ def test__handle_table_name_with_empty_tables(self):
         error_msg = 'Metadata does not contain any tables. No columns can be added.'
         with pytest.raises(ValueError, match=error_msg):
             instance._handle_table_name(None)
+
+    @patch('sdv.metadata.metadata.Metadata.load_from_dict')
+    def test_anonymize(self, mock_load_from_dict):
+        """Test that the `anonymize` method."""
+        # Setup
+        metadata = Metadata()
+        metadata._get_anonymized_dict = Mock(return_value={})
+        metadata.load_from_dict = Mock()
+
+        # Run
+        metadata.anonymize()
+
+        # Assert
+        metadata._get_anonymized_dict.assert_called_once()
+        mock_load_from_dict.assert_called_once_with({})

tests/unit/metadata/test_multi_table.py

@@ -3160,6 +3160,86 @@ def test_anonymize(self, mock_load):
             'child_foreign_key': 'col2',
         }
 
+    def test__get_anonymized_dict(self):
+        """Test the ``_get_anonymized_dict`` method."""
+        # Setup
+        metadata_dict = {
+            'tables': {
+                'real_table1': {
+                    'columns': {
+                        'table1_primary_key': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{3}'},
+                        'table1_column2': {'sdtype': 'categorical'},
+                    },
+                    'primary_key': 'table1_primary_key',
+                },
+                'real_table2': {
+                    'columns': {
+                        'table2_primary_key': {'sdtype': 'email'},
+                        'table2_foreign_key': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{3}'},
+                    },
+                    'primary_key': 'table2_primary_key',
+                },
+            },
+            'relationships': [
+                {
+                    'parent_table_name': 'real_table1',
+                    'parent_primary_key': 'table1_primary_key',
+                    'child_table_name': 'real_table2',
+                    'child_foreign_key': 'table2_foreign_key',
+                }
+            ],
+        }
+        metadata = MultiTableMetadata.load_from_dict(metadata_dict)
+
+        # Run
+        anonymized_dict = metadata._get_anonymized_dict()
+
+        # Assert
+        expected_anonymized_dict = {
+            'tables': {
+                'table1': {
+                    'columns': {
+                        'col1': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{3}'},
+                        'col2': {'sdtype': 'categorical'},
+                    },
+                    'primary_key': 'col1',
+                    'METADATA_SPEC_VERSION': 'SINGLE_TABLE_V1',
+                },
+                'table2': {
+                    'columns': {
+                        'col1': {'sdtype': 'email'},
+                        'col2': {'sdtype': 'id', 'regex_format': 'ID_[0-9]{3}'},
+                    },
+                    'primary_key': 'col1',
+                    'METADATA_SPEC_VERSION': 'SINGLE_TABLE_V1',
+                },
+            },
+            'relationships': [
+                {
+                    'parent_table_name': 'table1',
+                    'child_table_name': 'table2',
+                    'child_foreign_key': 'col2',
+                    'parent_primary_key': 'col1',
+                }
+            ],
+        }
+        assert anonymized_dict == expected_anonymized_dict
+
+    @patch('sdv.metadata.metadata.MultiTableMetadata.load_from_dict')
+    def test_anonymize_mock(self, mock_load_from_dict):
+        """Test that the `anonymize` method."""
+        # Setup
+        metadata = MultiTableMetadata()
+        metadata._get_anonymized_dict = Mock(return_value={})
+        metadata.load_from_dict = Mock()
+
+        # Run
+        metadata.anonymize()
+
+        # Assert
+        metadata._get_anonymized_dict.assert_called_once()
+        mock_load_from_dict.assert_called_once_with({})
+
     def test_update_columns_no_list_error(self):
         """Test that ``update_columns`` only takes in list and that an error is thrown."""
         # Setup