community[patch]: Add linter to catch @root_validator (#24070)

- Add linter to prevent further usage of vanilla root validator
- Udpate remaining root validators

libs/community/scripts/check_pydantic.sh

@@ -14,7 +14,7 @@ fi
 repository_path="$1"
 
 # Search for lines matching the pattern within the specified repository
-result=$(git -C "$repository_path" grep -E '^import pydantic|^from pydantic')
+result=$(git -C "$repository_path" grep -En '^import pydantic|^from pydantic')
 
 # Check if any matching lines were found
 if [ -n "$result" ]; then
@@ -25,3 +25,20 @@ if [ -n "$result" ]; then
   echo "with 'from langchain_core.pydantic_v1 import BaseModel'"
   exit 1
 fi
+
+# Forbid vanilla usage of @root_validator
+# This prevents the code from using either @root_validator or @root_validator()
+# Search for lines matching the pattern within the specified repository
+result=$(git -C "$repository_path" grep -En '(@root_validator\s*$)|(@root_validator\(\))' -- '*.py')
+
+# Check if any matching lines were found
+if [ -n "$result" ]; then
+  echo "ERROR: The following lines need to be updated:"
+  echo
+  echo "$result"
+  echo
+  echo "Please replace @root_validator or @root_validator() with either:"
+  echo
+  echo "@root_validator(pre=True) or @root_validator(pre=False, skip_on_failure=True)"
+  exit 1
+fi