multiple: pydantic 2 compatibility, v0.3 (#26443)

Signed-off-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Dan O'Donovan <dan.odonovan@gmail.com>
Co-authored-by: Tom Daniel Grande <tomdgrande@gmail.com>
Co-authored-by: Grande <Tom.Daniel.Grande@statsbygg.no>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: ccurme <chester.curme@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: Tomaz Bratanic <bratanic.tomaz@gmail.com>
Co-authored-by: ZhangShenao <15201440436@163.com>
Co-authored-by: Friso H. Kingma <fhkingma@gmail.com>
Co-authored-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Nuno Campos <nuno@langchain.dev>
Co-authored-by: Morgante Pell <morgantep@google.com>

libs/community/langchain_community/utilities/duckduckgo_search.py

@@ -4,9 +4,9 @@ No setup required. Free.
 https://pypi.org/project/duckduckgo-search/
 """
 
-from typing import Dict, List, Optional
+from typing import Any, Dict, List, Optional
 
-from langchain_core.pydantic_v1 import BaseModel, root_validator
+from pydantic import BaseModel, ConfigDict, model_validator
 
 
 class DuckDuckGoSearchAPIWrapper(BaseModel):
@@ -37,11 +37,13 @@ class DuckDuckGoSearchAPIWrapper(BaseModel):
     Options: text, news
     """
 
-    class Config:
-        extra = "forbid"
+    model_config = ConfigDict(
+        extra="forbid",
+    )
 
-    @root_validator(pre=True)
-    def validate_environment(cls, values: Dict) -> Dict:
+    @model_validator(mode="before")
+    @classmethod
+    def validate_environment(cls, values: Dict) -> Any:
         """Validate that python package exists in environment."""
         try:
             from duckduckgo_search import DDGS  # noqa: F401