core[patch]: resolve warnings (#26157)

Resolve a batch of warnings

libs/core/langchain_core/indexing/in_memory.py

@@ -79,4 +79,4 @@ class InMemoryDocumentIndex(DocumentIndex):
             counts_by_doc.append((document, count))
 
         counts_by_doc.sort(key=lambda x: x[1], reverse=True)
-        return [doc.copy() for doc, count in counts_by_doc[: self.top_k]]
+        return [doc.model_copy() for doc, count in counts_by_doc[: self.top_k]]

libs/core/langchain_core/messages/base.py

@@ -237,7 +237,7 @@ def message_to_dict(message: BaseMessage) -> dict:
         Message as a dict. The dict will have a "type" key with the message type
         and a "data" key with the message data as a dict.
     """
-    return {"type": message.type, "data": message.dict()}
+    return {"type": message.type, "data": message.model_dump()}
 
 
 def messages_to_dict(messages: Sequence[BaseMessage]) -> List[dict]:

libs/core/langchain_core/messages/utils.py

@@ -521,7 +521,7 @@ def merge_message_runs(
     messages = convert_to_messages(messages)
     merged: List[BaseMessage] = []
     for msg in messages:
-        curr = msg.copy(deep=True)
+        curr = msg.model_copy(deep=True)
         last = merged.pop() if merged else None
         if not last:
             merged.append(curr)
@@ -872,7 +872,7 @@ def _first_max_tokens(
     if idx < len(messages) - 1 and partial_strategy:
         included_partial = False
         if isinstance(messages[idx].content, list):
-            excluded = messages[idx].copy(deep=True)
+            excluded = messages[idx].model_copy(deep=True)
             num_block = len(excluded.content)
             if partial_strategy == "last":
                 excluded.content = list(reversed(excluded.content))
@@ -886,7 +886,7 @@ def _first_max_tokens(
             if included_partial and partial_strategy == "last":
                 excluded.content = list(reversed(excluded.content))
         if not included_partial:
-            excluded = messages[idx].copy(deep=True)
+            excluded = messages[idx].model_copy(deep=True)
             if isinstance(excluded.content, list) and any(
                 isinstance(block, str) or block["type"] == "text"
                 for block in messages[idx].content
@@ -977,11 +977,11 @@ _CHUNK_MSG_MAP = {v: k for k, v in _MSG_CHUNK_MAP.items()}
 
 def _msg_to_chunk(message: BaseMessage) -> BaseMessageChunk:
     if message.__class__ in _MSG_CHUNK_MAP:
-        return _MSG_CHUNK_MAP[message.__class__](**message.dict(exclude={"type"}))
+        return _MSG_CHUNK_MAP[message.__class__](**message.model_dump(exclude={"type"}))
 
     for msg_cls, chunk_cls in _MSG_CHUNK_MAP.items():
         if isinstance(message, msg_cls):
-            return chunk_cls(**message.dict(exclude={"type"}))
+            return chunk_cls(**message.model_dump(exclude={"type"}))
 
     raise ValueError(
         f"Unrecognized message class {message.__class__}. Supported classes are "
@@ -992,11 +992,11 @@ def _msg_to_chunk(message: BaseMessage) -> BaseMessageChunk:
 def _chunk_to_msg(chunk: BaseMessageChunk) -> BaseMessage:
     if chunk.__class__ in _CHUNK_MSG_MAP:
         return _CHUNK_MSG_MAP[chunk.__class__](
-            **chunk.dict(exclude={"type", "tool_call_chunks"})
+            **chunk.model_dump(exclude={"type", "tool_call_chunks"})
         )
     for chunk_cls, msg_cls in _CHUNK_MSG_MAP.items():
         if isinstance(chunk, chunk_cls):
-            return msg_cls(**chunk.dict(exclude={"type", "tool_call_chunks"}))
+            return msg_cls(**chunk.model_dump(exclude={"type", "tool_call_chunks"}))
 
     raise ValueError(
         f"Unrecognized message chunk class {chunk.__class__}. Supported classes are "

libs/core/langchain_core/runnables/fallbacks.py

@@ -622,7 +622,7 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
 
                 return self.__class__(
                     **{
-                        **self.dict(),
+                        **self.model_dump(),
                         **{"runnable": new_runnable, "fallbacks": new_fallbacks},
                     }
                 )

libs/core/langchain_core/tools/base.py

@@ -37,6 +37,7 @@ from pydantic import (
     model_validator,
     validate_arguments,
 )
+from pydantic.v1 import BaseModel as BaseModelV1
 from typing_extensions import Annotated
 
 from langchain_core._api import deprecated
@@ -479,10 +480,20 @@ class ChildTool(BaseTool):
             return tool_input
         else:
             if input_args is not None:
-                result = input_args.parse_obj(tool_input)
+                if issubclass(input_args, BaseModel):
+                    result = input_args.model_validate(tool_input)
+                    result_dict = result.model_dump()
+                elif issubclass(input_args, BaseModelV1):
+                    result = input_args.parse_obj(tool_input)
+                    result_dict = result.dict()
+                else:
+                    raise NotImplementedError(
+                        "args_schema must be a Pydantic BaseModel, "
+                        f"got {self.args_schema}"
+                    )
                 return {
                     k: getattr(result, k)
-                    for k, v in result.dict().items()
+                    for k, v in result_dict.items()
                     if k in tool_input
                 }
             return tool_input

libs/core/tests/unit_tests/test_messages.py

@@ -429,8 +429,8 @@ def test_message_chunk_to_message() -> None:
         ],
     )
     assert message_chunk_to_message(chunk) == expected
-    assert AIMessage(**expected.dict()) == expected
+    assert AIMessage(**expected.model_dump()) == expected
-    assert AIMessageChunk(**chunk.dict()) == chunk
+    assert AIMessageChunk(**chunk.model_dump()) == chunk
 
 
 def test_tool_calls_merge() -> None: