fix: Add missing init param to to_dict in hf doc embedder (#11320)

Author: sjrl

haystack/components/embedders/hugging_face_api_document_embedder.py

@@ -211,6 +211,7 @@ def to_dict(self) -> dict[str, Any]:
             progress_bar=self.progress_bar,
             meta_fields_to_embed=self.meta_fields_to_embed,
             embedding_separator=self.embedding_separator,
+            concurrency_limit=self.concurrency_limit,
         )
 
     @classmethod

releasenotes/notes/serialize-hf-api-document-embedder-concurrency-limit-294a8c69eb3792c4.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Fixed ``HuggingFaceAPIDocumentEmbedder`` serialization to preserve the configured ``concurrency_limit``.

test/components/embedders/test_hugging_face_api_document_embedder.py

@@ -107,6 +107,7 @@ def test_to_dict(self, mock_check_valid_model):
             progress_bar=False,
             meta_fields_to_embed=["meta_field"],
             embedding_separator=" ",
+            concurrency_limit=7,
         )
 
         data = embedder.to_dict()
@@ -125,6 +126,7 @@ def test_to_dict(self, mock_check_valid_model):
                 "progress_bar": False,
                 "meta_fields_to_embed": ["meta_field"],
                 "embedding_separator": " ",
+                "concurrency_limit": 7,
             },
         }
 
@@ -143,6 +145,7 @@ def test_from_dict(self, mock_check_valid_model):
                 "progress_bar": False,
                 "meta_fields_to_embed": ["meta_field"],
                 "embedding_separator": " ",
+                "concurrency_limit": 7,
             },
         }
 
@@ -158,6 +161,7 @@ def test_from_dict(self, mock_check_valid_model):
         assert not embedder.progress_bar
         assert embedder.meta_fields_to_embed == ["meta_field"]
         assert embedder.embedding_separator == " "
+        assert embedder.concurrency_limit == 7
 
     def test_prepare_texts_to_embed_w_metadata(self):
         documents = [