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---
title: Přehled
description: Nakonfigurujte samotnou aplikaci – její identitu, výchozí oprávnění a to, co se spouští při instalaci.
icon: screwdriver-wrench
---
**Konfigurační vrstva** aplikace Twenty popisuje aplikaci *platformě* – její identitu, oprávnění, která má, a kód, který se spouští během instalace nebo aktualizace. Tato deklarativní nastavení nepřidávají nové datové struktury ani chování za běhu; říkají Twenty, *co je aplikace zač* a *jak ji nastavit*.
```text
┌────────────────────────────────────────────────────────┐
│ Application — identity, default role, variables, │
│ marketplace metadata │
│ │
│ ┌──────────────────────────────────────────────────┐ │
│ │ Role — what the app's logic functions can read │ │
│ │ and write (referenced by Application) │ │
│ └──────────────────────────────────────────────────┘ │
└────────────────────────────────────────────────────────┘
│
▼ (at install / upgrade time)
┌──────────────────────────────────┐
│ Pre-install hook │ before metadata migration
└──────────────────────────────────┘
┌──────────────────────────────────┐
│ Post-install hook │ after metadata migration
└──────────────────────────────────┘
│
▼ (at uninstall time)
┌──────────────────────────────────┐
│ Uninstall hook │ before app removal
└──────────────────────────────────┘
```
## V této části
<CardGroup cols={2}>
<Card title="Konfigurace aplikace" icon="rocket" href="/l/cs/developers/extend/apps/config/application">
`defineApplication` – identita, výchozí role, proměnné, metadata pro marketplace.
</Card>
<Card title="Role a oprávnění" icon="shield-halved" href="/l/cs/developers/extend/apps/config/roles">
`defineRole` – deklaruje, co mohou logické funkce vaší aplikace číst a zapisovat.
</Card>
<Card title="Instalační hooky" icon="wrench" href="/l/cs/developers/extend/apps/config/install-hooks">
`definePreInstallLogicFunction`, `definePostInstallLogicFunction` a `defineUninstallLogicFunction` — zálohují data, nastavují výchozí hodnoty, validují aktualizace, uklízejí při odebrání.
</Card>
</CardGroup>
## Jak spolu části souvisejí
* **Aplikace** je vstupní bod. Každá aplikace má právě jedno volání `defineApplication()`, které ukazuje na jednu **roli** jako výchozí.
* **Role** určuje, co mohou logické funkce aplikace a front-endové komponenty číst a zapisovat. Dodržujte zásadu nejmenších oprávnění: udělujte pouze ta oprávnění, která váš kód skutečně potřebuje.
* **Instalační hooky** se spouštějí během instalace nebo aktualizace – pre-install před migrací metadat (aby mohly odmítnout rizikovou aktualizaci), post-install po migraci (aby mohly proti novému schématu naplnit výchozí data). Hook pro odinstalaci se spouští těsně před odebráním aplikace, takže může uklidit externí prostředky, zatímco data aplikace jsou stále čitelná.
<Note>
Instalační hooky sdílejí běhové prostředí [logických funkcí](/l/cs/developers/extend/apps/logic/logic-functions) – stejný podpis handleru, stejné proměnné prostředí, stejný typovaný klient API – ale deklarují se pomocí vlastních funkcí define a fungují mimo běžný model spouštěčů (HTTP, cron, databázové události).
</Note>