tiangolo.fastapi/docs/em/docs/tutorial/dependencies/sub-dependencies.md

🎧-🔗

👆 💪 ✍ 🔗 👈 ✔️ 🎧-🔗.

👫 💪 ⏬ 👆 💪 👫.

FastAPI 🔜 ✊ 💅 🔬 👫.

🥇 🔗 "☑"

👆 💪 ✍ 🥇 🔗 ("☑") 💖:

=== "🐍 3️⃣.6️⃣ & 🔛"

```Python hl_lines="8-9"
{!> ../../../docs_src/dependencies/tutorial005.py!}
```

=== "🐍 3️⃣.1️⃣0️⃣ & 🔛"

```Python hl_lines="6-7"
{!> ../../../docs_src/dependencies/tutorial005_py310.py!}
```

⚫️ 📣 📦 🔢 🔢 q str, & ⤴️ ⚫️ 📨 ⚫️.

👉 🙅 (🚫 📶 ⚠), ✋️ 🔜 ℹ 👥 🎯 🔛 ❔ 🎧-🔗 👷.

🥈 🔗, "☑" & "⚓️"

⤴️ 👆 💪 ✍ ➕1️⃣ 🔗 🔢 ("☑") 👈 🎏 🕰 📣 🔗 🚮 👍 (⚫️ "⚓️" 💁‍♂️):

=== "🐍 3️⃣.6️⃣ & 🔛"

```Python hl_lines="13"
{!> ../../../docs_src/dependencies/tutorial005.py!}
```

=== "🐍 3️⃣.1️⃣0️⃣ & 🔛"

```Python hl_lines="11"
{!> ../../../docs_src/dependencies/tutorial005_py310.py!}
```

➡️ 🎯 🔛 🔢 📣:

• ✋️ 👉 🔢 🔗 ("☑") ⚫️, ⚫️ 📣 ➕1️⃣ 🔗 (⚫️ "🪀" 🔛 🕳 🙆).
  • ⚫️ 🪀 🔛 query_extractor, & 🛠️ 💲 📨 ⚫️ 🔢 q.
• ⚫️ 📣 📦 last_query 🍪, str.
  • 🚥 👩‍💻 🚫 🚚 🙆 🔢 q, 👥 ⚙️ 🏁 🔢 ⚙️, ❔ 👥 🖊 🍪 ⏭.

⚙️ 🔗

⤴️ 👥 💪 ⚙️ 🔗 ⏮️:

=== "🐍 3️⃣.6️⃣ & 🔛"

```Python hl_lines="22"
{!> ../../../docs_src/dependencies/tutorial005.py!}
```

=== "🐍 3️⃣.1️⃣0️⃣ & 🔛"

```Python hl_lines="19"
{!> ../../../docs_src/dependencies/tutorial005_py310.py!}
```

!!! info 👀 👈 👥 🕴 📣 1️⃣ 🔗 ➡ 🛠️ 🔢, query_or_cookie_extractor.

✋️ **FastAPI** 🔜 💭 👈 ⚫️ ✔️ ❎ `query_extractor` 🥇, 🚶‍♀️ 🏁 👈 `query_or_cookie_extractor` ⏪ 🤙 ⚫️.

graph TB

query_extractor(["query_extractor"])
query_or_cookie_extractor(["query_or_cookie_extractor"])

read_query["/items/"]

query_extractor --> query_or_cookie_extractor --> read_query

⚙️ 🎏 🔗 💗 🕰

🚥 1️⃣ 👆 🔗 📣 💗 🕰 🎏 ➡ 🛠️, 🖼, 💗 🔗 ✔️ ⚠ 🎧-🔗, FastAPI 🔜 💭 🤙 👈 🎧-🔗 🕴 🕐 📍 📨.

& ⚫️ 🔜 🖊 📨 💲 "💾" & 🚶‍♀️ ⚫️ 🌐 "⚓️" 👈 💪 ⚫️ 👈 🎯 📨, ↩️ 🤙 🔗 💗 🕰 🎏 📨.

🏧 😐 🌐❔ 👆 💭 👆 💪 🔗 🤙 🔠 🔁 (🎲 💗 🕰) 🎏 📨 ↩️ ⚙️ "💾" 💲, 👆 💪 ⚒ 🔢 use_cache=False 🕐❔ ⚙️ Depends:

async def needy_dependency(fresh_value: str = Depends(get_value, use_cache=False)):
    return {"fresh_value": fresh_value}

🌃

↖️ ⚪️➡️ 🌐 🎀 🔤 ⚙️ 📥, 🔗 💉 ⚙️ 🙅.

🔢 👈 👀 🎏 ➡ 🛠️ 🔢.

✋️, ⚫️ 📶 🏋️, & ✔ 👆 📣 🎲 🙇 🐦 🔗 "📊" (🌲).

!!! tip 🌐 👉 💪 🚫 😑 ⚠ ⏮️ 👫 🙅 🖼.

✋️ 👆 🔜 👀 ❔ ⚠ ⚫️ 📃 🔃 **💂‍♂**.

 & 👆 🔜 👀 💸 📟 ⚫️ 🔜 🖊 👆.