ENH: Add treatment for null types

src/caosadvancedtools/models/parser.py

@@ -77,7 +77,8 @@ JSON_SCHEMA_ATOMIC_TYPES = [
     "string",
     "boolean",
     "integer",
-    "number"
+    "number",
+    "null"
 ]
 
 
@@ -726,6 +727,10 @@ class JsonSchemaParser(Parser):
             return db.DOUBLE
         elif elt["type"] == "boolean":
             return db.BOOLEAN
+        elif elt["type"] == "null":
+            # This could be any datatype since a valid json will never have a
+            # value in a null property. We use TEXT for convenience.
+            return db.TEXT
         else:
             raise JsonSchemaDefinitionError(f"Unkown atomic type in {elt}.")
 
@@ -761,6 +766,9 @@ class JsonSchemaParser(Parser):
             ent = self._treat_record_type(elt, name)
         elif elt["type"] == "array":
             ent, force_list = self._treat_list(elt, name)
+        elif elt["type"] == "null":
+            # null
+            return None, force_list
         else:
             raise NotImplementedError(
                 f"Cannot parse items of type '{elt['type']}' (yet).")

unittests/json-schema-models/datamodel_atomic_properties.schema.json

@@ -18,7 +18,8 @@
             "date": { "type": "string", "format": "date" },
             "integer": { "type": "integer", "description": "Some integer property" },
             "boolean": { "type": "boolean" },
-            "number_prop": { "type": "number", "description": "Some float property" }
+            "number_prop": { "type": "number", "description": "Some float property" },
+            "null_prop": { "type": "null", "description": "This property will never have a value." }
         }
     }
 ]

unittests/test_json_schema_model_parser.py

@@ -103,7 +103,7 @@ def test_datamodel_with_atomic_properties():
     assert isinstance(rt2, db.RecordType)
     assert rt2.name == "Dataset2"
     assert not rt2.description
-    assert len(rt2.get_properties()) == 5
+    assert len(rt2.get_properties()) == 6
 
     date_prop = rt2.get_property("date")
     assert date_prop.datatype == db.DATETIME
@@ -121,6 +121,9 @@ def test_datamodel_with_atomic_properties():
     float_prop2 = rt2.get_property("number_prop")
     assert float_prop.datatype == float_prop2.datatype
 
+    null_prop = rt2.get_property("null_prop")
+    assert null_prop.datatype == db.TEXT
+
 
 def test_required_no_list():
     """Exception must be raised when "required" is not a list."""