📝 Update docs in examples for settings with Pydantic v2 (#9799)

docs/en/docs/advanced/settings.md

@@ -344,14 +344,28 @@ APP_NAME="ChimichangApp"
 
 And then update your `config.py` with:
 
-```Python hl_lines="9-10"
-{!../../../docs_src/settings/app03/config.py!}
-```
+=== "Pydantic v2"
 
-Here we create a class `Config` inside of your Pydantic `Settings` class, and set the `env_file` to the filename with the dotenv file we want to use.
+    ```Python hl_lines="9"
+    {!> ../../../docs_src/settings/app03_an/config.py!}
+    ```
 
-!!! tip
-    The `Config` class is used just for Pydantic configuration. You can read more at <a href="https://pydantic-docs.helpmanual.io/usage/model_config/" class="external-link" target="_blank">Pydantic Model Config</a>
+    !!! tip
+        The `model_config` attribute is used just for Pydantic configuration. You can read more at <a href="https://docs.pydantic.dev/latest/usage/model_config/" class="external-link" target="_blank">Pydantic Model Config</a>.
+
+=== "Pydantic v1"
+
+    ```Python hl_lines="9-10"
+    {!> ../../../docs_src/settings/app03_an/config_pv1.py!}
+    ```
+
+    !!! tip
+        The `Config` class is used just for Pydantic configuration. You can read more at <a href="https://docs.pydantic.dev/1.10/usage/model_config/" class="external-link" target="_blank">Pydantic Model Config</a>.
+
+!!! info
+    In Pydantic version 1 the configuration was done in an internal class `Config`, in Pydantic version 2 it's done in an attribute `model_config`. This attribute takes a `dict`, and to get autocompletion and inline errors you can import and use `SettingsConfigDict` to define that `dict`.
+
+Here we define the config `env_file` inside of your Pydantic `Settings` class, and set the value to the filename with the dotenv file we want to use.
 
 ### Creating the `Settings` only once with `lru_cache`
 

docs_src/settings/app03_an/config.py

@@ -1,4 +1,4 @@
-from pydantic_settings import BaseSettings
+from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
@@ -6,5 +6,4 @@ class Settings(BaseSettings):
     admin_email: str
     items_per_user: int = 50
 
-    class Config:
-        env_file = ".env"
+    model_config = SettingsConfigDict(env_file=".env")

docs_src/settings/app03_an/config_pv1.py

@@ -0,0 +1,10 @@
+from pydantic import BaseSettings
+
+
+class Settings(BaseSettings):
+    app_name: str = "Awesome API"
+    admin_email: str
+    items_per_user: int = 50
+
+    class Config:
+        env_file = ".env"