++

packages/langchain_vertexai_shim/langchain_vertexai_shim/__init__.py

@@ -0,0 +1,35 @@
+"""
+langchain-vertexai-shim
+
+目的：ragas 0.4.3 在 import 时仍然从
+    langchain_community.chat_models.vertexai
+拉取 ChatVertexAI，但该路径在新版 langchain-community 中已被移除，
+官方维护迁到了独立分发 langchain-google-vertexai。
+
+本包提供一个轻量垫片，把符号同步过去，让 `import ragas` 不再崩。
+用法（uv sync 后自动生效）：
+
+    import langchain_vertexai_shim      # noqa: F401  — 只需 import 一次即可
+    import ragas
+"""
+
+import sys
+import types
+
+try:
+    from langchain_google_vertexai.chat_models import ChatVertexAI
+except Exception:  # pragma: no cover - optional dep 没装就静默跳过
+    ChatVertexAI = None  # type: ignore[assignment]
+
+import langchain_community.chat_models as _cm  # noqa: E402
+
+# 1) 注册子模块：langchain_community.chat_models.vertexai
+_vertexai_module = types.ModuleType("langchain_community.chat_models.vertexai")
+_vertexai_module.ChatVertexAI = ChatVertexAI
+_cm.vertexai = _vertexai_module  # 让 `from langchain_community.chat_models import vertexai` 可用
+sys.modules.setdefault(
+    "langchain_community.chat_models.vertexai", _vertexai_module
+)
+
+__all__ = ["ChatVertexAI"]
+__version__ = "0.1.0"

packages/langchain_vertexai_shim/pyproject.toml

@@ -0,0 +1,13 @@
+[project]
+name = "langchain-vertexai-shim"
+version = "0.1.0"
+description = "Provide langchain_community.chat_models.vertexai.ChatVertexAI import path expected by ragas 0.4.3, which has moved to langchain-google-vertexai in newer langchain-community releases."
+requires-python = ">=3.10"
+dependencies = ["langchain-google-vertexai>=2.0"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["langchain_vertexai_shim"]