fix: add missing name() method to WatsonEmbeddingFunction

Fixes #3597 - ChromaDB expects embedding functions to have a name() method
for validation. Added static method that returns 'watson' following the
same pattern as other embedding functions.

- Added comprehensive tests to verify the fix
- Ensures compatibility with ChromaDB validation requirements
- No regressions in existing Watson embedding functionality

Co-Authored-By: João <joao@crewai.com>

src/crewai/rag/embeddings/providers/ibm/embedding_callable.py

@@ -152,3 +152,8 @@ class WatsonEmbeddingFunction(EmbeddingFunction[Documents]):
         except Exception as e:
             print(f"Error during Watson embedding: {e}")
             raise
+
+    @staticmethod
+    def name() -> str:
+        """Return the name identifier for this embedding function."""
+        return "watson"

tests/rag/embeddings/test_watson_embedding_name.py

@@ -0,0 +1,75 @@
+"""Tests for Watson embedding function name method."""
+
+import pytest
+from unittest.mock import patch, MagicMock
+
+from crewai.rag.embeddings.providers.ibm.embedding_callable import WatsonEmbeddingFunction
+
+
+class TestWatsonEmbeddingName:
+    """Test Watson embedding function name method."""
+
+    def test_watson_embedding_function_has_name_method(self):
+        """Test that WatsonEmbeddingFunction has a name method."""
+        assert hasattr(WatsonEmbeddingFunction, 'name')
+        assert callable(getattr(WatsonEmbeddingFunction, 'name'))
+
+    def test_watson_embedding_function_name_returns_watson(self):
+        """Test that the name method returns 'watson'."""
+        assert WatsonEmbeddingFunction.name() == "watson"
+
+    def test_watson_embedding_function_name_is_static(self):
+        """Test that the name method can be called without instantiation."""
+        name = WatsonEmbeddingFunction.name()
+        assert name == "watson"
+        assert isinstance(name, str)
+
+    def test_watson_embedding_function_name_with_chromadb_validation(self):
+        """Test that the name method works in ChromaDB validation scenario."""
+        config = {
+            "model_id": "test-model",
+            "api_key": "test-key",
+            "url": "https://test.com"
+        }
+        
+        watson_func = WatsonEmbeddingFunction(**config)
+        
+        try:
+            name = watson_func.name()
+            assert name == "watson"
+        except AttributeError as e:
+            pytest.fail(f"ChromaDB validation failed with AttributeError: {e}")
+
+    def test_watson_embedding_function_name_method_signature(self):
+        """Test that the name method has the correct signature."""
+        import inspect
+        
+        name_method = getattr(WatsonEmbeddingFunction, 'name')
+        
+        assert isinstance(inspect.getattr_static(WatsonEmbeddingFunction, 'name'), staticmethod)
+        
+        sig = inspect.signature(name_method)
+        if sig.return_annotation != inspect.Signature.empty:
+            assert sig.return_annotation == str
+
+    def test_watson_embedding_function_reproduces_original_issue(self):
+        """Test that reproduces the original issue scenario from #3597."""
+        
+        
+        config = {
+            "model_id": "ibm/slate-125m-english-rtrvr",
+            "api_key": "test-key",
+            "url": "https://us-south.ml.cloud.ibm.com",
+            "project_id": "test-project"
+        }
+        
+        watson_func = WatsonEmbeddingFunction(**config)
+        
+        name = watson_func.name()
+        
+        assert name == "watson"
+        assert isinstance(name, str)
+        
+        class_name = WatsonEmbeddingFunction.name()
+        assert class_name == "watson"
+        assert class_name == name