How to Extract Tags Name And Description In Fastapi?

In FastAPI, you can extract tags name and description by defining a parameter with the type of List[str] as tags and description as a string in the endpoint function definition. You can then access these values from the parameter directly within your function logic. This allows you to easily organize and provide documentation for your API endpoints using tags and descriptions.

What is the process of extracting tags in FastAPI?

In FastAPI, you can define tags for your API routes by using the tags parameter in the router decorator.

Here's an example of how you can define tags for your API routes in FastAPI:

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from fastapi import FastAPI, APIRouter

app = FastAPI()

router = APIRouter()

@router.get("/items/", tags=["items"])
async def read_items():
    return {"message": "Read all items"}

@router.post("/items/", tags=["items"])
async def create_item():
    return {"message": "Create a new item"}

app.include_router(router)

In this example, we have defined two API routes - GET /items/ and POST /items/ - and assigned the tag "items" to both of them.

After defining your tags on the routes, you can access the tags that have been defined for each route in the Swagger documentation that is automatically generated by FastAPI. The tags will be displayed under each route in the Swagger UI, allowing users to easily navigate and understand the different parts of your API.

What is the most reliable way to extract tags in FastAPI?

The most reliable way to extract tags in FastAPI is by using query parameters in the request URL. You can define a route with a query parameter for tags, and then use the Query parameter in the route function to extract the value of the tag parameter. Here is an example of how to do this:

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from fastapi import FastAPI, Query

app = FastAPI()

@app.get("/items/")
async def read_items(tag: str = Query(None)):
    if tag is not None:
        return {"tag": tag}
    return {"message": "No tag provided"}

In this example, the route /items/ expects a tag parameter in the request URL. If a tag parameter is provided, it will be extracted and returned in the response. If no tag parameter is provided, a message will be returned indicating that no tag was provided. This is a reliable way to extract tags in FastAPI because it relies on the standardized use of query parameters in URLs.

How can I access tag information in FastAPI?

In FastAPI, you can access tag information by using the tags parameter when defining your API routes.

Here is an example of how you can define tags for your API routes in FastAPI:

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from fastapi import FastAPI

app = FastAPI()

@app.get("/items/", tags=["items"])
async def read_items():
    return {"message": "Read all items"}

@app.post("/items/", tags=["items"])
async def create_item():
    return {"message": "Create a new item"}

@app.get("/users/", tags=["users"])
async def read_users():
    return {"message": "Read all users"}

In this example, we have defined two tags, "items" and "users", and assigned them to the corresponding API routes using the tags parameter.

You can access tag information in FastAPI by using the app.openapi_schema attribute, which contains the OpenAPI schema information for your API. You can retrieve tag information from this attribute to access tag information.

For example, to access tag information in FastAPI, you can use the following code:

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print(app.openapi_schema["tags"])

This will print out a list of dictionaries containing information about each tag defined in your API routes. Each dictionary contains information such as the tag name, description, and any additional external documentation URLs.

By accessing tag information in FastAPI, you can organize and categorize your API routes and make it easier for users to navigate and understand the functionality of your API.