Allow provide object hashes / classifications

encord/objects/classification.py

@@ -32,9 +32,12 @@ def title(self) -> str:
     def children(self) -> Sequence[OntologyElement]:
         return self.attributes
 
-    def create_instance(self) -> ClassificationInstance:
-        """Create a :class:`encord.objects.ClassificationInstance` to be used with a label row."""
-        return ClassificationInstance(self)
+    def create_instance(self, classification_hash: Optional[str] = None) -> ClassificationInstance:
+        """Create a :class:`encord.objects.ClassificationInstance` to be used with a label row.
+        Args:
+            classification_hash: str = None. Classification hash for the created instance.
+        """
+        return ClassificationInstance(self, classification_hash=classification_hash)
 
     @classmethod
     def from_dict(cls, d: dict) -> Classification:

encord/objects/ontology_object.py

@@ -32,9 +32,13 @@ def title(self) -> str:
     def children(self) -> Sequence[OntologyElement]:
         return self.attributes
 
-    def create_instance(self) -> ObjectInstance:
-        """Create a :class:`encord.objects.ObjectInstance` to be used with a label row."""
-        return ObjectInstance(self)
+    def create_instance(self, object_hash: Optional[str] = None) -> ObjectInstance:
+        """
+        Create a :class:`encord.objects.ObjectInstance` to be used with a label row.
+        Args:
+            object_hash: str = None. object_hash for the created instance
+        """
+        return ObjectInstance(self, object_hash=object_hash)
 
     @classmethod
     def from_dict(cls, d: dict) -> Object:

tests/objects/test_label_structure.py

@@ -984,3 +984,11 @@ def test_classification_can_be_added_edited_and_removed(ontology):
     label_row.remove_classification(classification_instance)
 
     assert len(label_row.get_classification_instances()) == 0
+
+
+def test_can_provide_object_classification_hashes():
+    object_instance = box_ontology_item.create_instance(object_hash="ObjectHash")
+    assert object_instance.object_hash == "ObjectHash"
+
+    classification_instance = text_classification.create_instance(classification_hash="ClassificationHash")
+    assert classification_instance.classification_hash == "ClassificationHash"