From 3c387bc12de8959b37af4d4def5be3d1c7e0ee2e Mon Sep 17 00:00:00 2001
From: ARKA1112 <bagha92@gmail.com>
Date: Sun, 28 Jan 2024 06:16:48 +0530
Subject: [PATCH] docs: Error when importing packages from pydantic [docs]
 (#16564)

URL : https://python.langchain.com/docs/use_cases/extraction

Desc:
<b> While the following statement executes successfully, it throws an
error which is described below when we use the imported packages</b>
 ```py
from pydantic import BaseModel, Field, validator
```
Code:
```python
from langchain.output_parsers import PydanticOutputParser
from langchain.prompts import (
    PromptTemplate,
)
from langchain_openai import OpenAI
from pydantic import BaseModel, Field, validator

# Define your desired data structure.
class Joke(BaseModel):
    setup: str = Field(description="question to set up a joke")
    punchline: str = Field(description="answer to resolve the joke")

    # You can add custom validation logic easily with Pydantic.
    @validator("setup")
    def question_ends_with_question_mark(cls, field):
        if field[-1] != "?":
            raise ValueError("Badly formed question!")
        return field
```

Error:
```md
PydanticUserError: The `field` and `config` parameters are not available
in Pydantic V2, please use the `info` parameter instead.

For further information visit
https://errors.pydantic.dev/2.5/u/validator-field-config-info
```

Solution:
Instead of doing:
```py
from pydantic import BaseModel, Field, validator
```
We should do:
```py
from langchain_core.pydantic_v1 import BaseModel, Field, validator
```
Thanks.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>
---
 docs/docs/use_cases/extraction.ipynb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/docs/use_cases/extraction.ipynb b/docs/docs/use_cases/extraction.ipynb
index e36586edacc..167d8c47022 100644
--- a/docs/docs/use_cases/extraction.ipynb
+++ b/docs/docs/use_cases/extraction.ipynb
@@ -430,7 +430,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": null,
    "id": "64650362",
    "metadata": {},
    "outputs": [
@@ -452,8 +452,8 @@
     "from langchain.prompts import (\n",
     "    PromptTemplate,\n",
     ")\n",
+    "from langchain_core.pydantic_v1 import BaseModel, Field, validator\n",
     "from langchain_openai import OpenAI\n",
-    "from pydantic import BaseModel, Field, validator\n",
     "\n",
     "\n",
     "class Person(BaseModel):\n",
@@ -531,8 +531,8 @@
     "from langchain.prompts import (\n",
     "    PromptTemplate,\n",
     ")\n",
+    "from langchain_core.pydantic_v1 import BaseModel, Field, validator\n",
     "from langchain_openai import OpenAI\n",
-    "from pydantic import BaseModel, Field, validator\n",
     "\n",
     "\n",
     "# Define your desired data structure.\n",