feat: update Cohere embedding model to use langchain_cohere, added support to dynamically load latest embedding models, improved error handling (#6034)

* update cohere model

* Update src/backend/base/langflow/components/embeddings/cohere.py

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

---------

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

pyproject.toml

@@ -109,7 +109,7 @@ dependencies = [
     "uv>=0.5.7",
     "ag2>=0.1.0",
     "scrapegraph-py>=1.10.2",
-    "pydantic-ai>=0.0.19"
+    "pydantic-ai>=0.0.19",
 ]
 
 [tool.uv.sources]

src/backend/base/langflow/components/embeddings/cohere.py

@@ -1,9 +1,14 @@
-from langchain_community.embeddings.cohere import CohereEmbeddings
+from typing import Any
+
+import cohere
+from langchain_cohere import CohereEmbeddings
 
 from langflow.base.models.model import LCModelComponent
 from langflow.field_typing import Embeddings
 from langflow.io import DropdownInput, FloatInput, IntInput, MessageTextInput, Output, SecretStrInput
 
+HTTP_STATUS_OK = 200
+
 
 class CohereEmbeddingsComponent(LCModelComponent):
     display_name = "Cohere Embeddings"
@@ -12,9 +17,9 @@ class CohereEmbeddingsComponent(LCModelComponent):
     name = "CohereEmbeddings"
 
     inputs = [
-        SecretStrInput(name="cohere_api_key", display_name="Cohere API Key", required=True),
+        SecretStrInput(name="api_key", display_name="Cohere API Key", required=True, real_time_refresh=True),
         DropdownInput(
-            name="model",
+            name="model_name",
             display_name="Model",
             advanced=False,
             options=[
@@ -24,6 +29,8 @@ class CohereEmbeddingsComponent(LCModelComponent):
                 "embed-multilingual-light-v2.0",
             ],
             value="embed-english-v2.0",
+            refresh_button=True,
+            combobox=True,
         ),
         MessageTextInput(name="truncate", display_name="Truncate", advanced=True),
         IntInput(name="max_retries", display_name="Max Retries", value=3, advanced=True),
@@ -36,11 +43,39 @@ class CohereEmbeddingsComponent(LCModelComponent):
     ]
 
     def build_embeddings(self) -> Embeddings:
-        return CohereEmbeddings(
+        data = None
-            cohere_api_key=self.cohere_api_key,
+        try:
-            model=self.model,
+            data = CohereEmbeddings(
+                cohere_api_key=self.api_key,
+                model=self.model_name,
                 truncate=self.truncate,
                 max_retries=self.max_retries,
                 user_agent=self.user_agent,
                 request_timeout=self.request_timeout or None,
             )
+        except Exception as e:
+            msg = (
+                "Unable to create Cohere Embeddings. ",
+                "Please verify the API key and model parameters, and try again.",
+            )
+            raise ValueError(msg) from e
+        # added status if not the return data would be serialised to create the status
+        return data
+
+    def get_model(self):
+        try:
+            co = cohere.ClientV2(self.api_key)
+            response = co.models.list(endpoint="embed")
+            models = response.models
+            return [model.name for model in models]
+        except Exception as e:
+            msg = f"Failed to fetch Cohere models. Error: {e}"
+            raise ValueError(msg) from e
+
+    async def update_build_config(self, build_config: dict, field_value: Any, field_name: str | None = None):
+        if field_name in {"model_name", "api_key"}:
+            if build_config.get("api_key", {}).get("value", None):
+                build_config["model_name"]["options"] = self.get_model()
+        else:
+            build_config["model_name"]["options"] = field_value
+        return build_config