fix: Add additionalProperties to fields of type object (#601)

Author: edgarrmondragon

tap_postgres/client.py

@@ -69,8 +69,14 @@ def array_to_jsonschema(self, column_type: postgresql.ARRAY) -> dict:
     def json_to_jsonschema(self, column_type: postgresql.JSON) -> dict:
         """Override the default mapping for JSON and JSONB columns."""
         if self.json_as_object:
-            return {"type": ["object", "null"]}
-        return {"type": ["string", "number", "integer", "array", "object", "boolean"]}
+            return {
+                "type": ["object", "null"],
+                "additionalProperties": True,
+            }
+        return {
+            "type": ["string", "number", "integer", "array", "object", "boolean"],
+            "additionalProperties": True,
+        }
 
     @to_jsonschema.register
     def datetime_to_jsonschema(self, column_type: sqlalchemy.types.DateTime) -> dict:

tests/test_core.py

@@ -258,7 +258,8 @@ def test_jsonb_json():
                     "object",
                     "boolean",
                     "null",
-                ]
+                ],
+                "additionalProperties": True,
             }
             assert schema_message["schema"]["properties"]["column_json"] == {
                 "type": [
@@ -269,7 +270,8 @@ def test_jsonb_json():
                     "object",
                     "boolean",
                     "null",
-                ]
+                ],
+                "additionalProperties": True,
             }
     for i in range(len(rows)):
         assert test_runner.records[altered_table_name][i] == rows[i]
@@ -330,7 +332,8 @@ def test_jsonb_array():
                         "array",
                         "object",
                         "boolean",
-                    ]
+                    ],
+                    "additionalProperties": True,
                 },
                 "type": ["array", "null"],
             }
@@ -397,13 +400,15 @@ def test_json_as_object():
                 "type": [
                     "object",
                     "null",
-                ]
+                ],
+                "additionalProperties": True,
             }
             assert schema_message["schema"]["properties"]["column_json"] == {
                 "type": [
                     "object",
                     "null",
-                ]
+                ],
+                "additionalProperties": True,
             }
 
     assert len(rows) == len(test_runner.records[altered_table_name])