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doc: async.md improve Optimistic update example #1184

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30 changes: 22 additions & 8 deletions docs/src/content/docs/handbook/async.md
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Original file line number Diff line number Diff line change
Expand Up @@ -302,20 +302,34 @@ const updateUser = action(async (userId: string, updates: Partial<User>) => {
}, 'updateUser').extend(withAsync())

updateUser.subscribe(({ promise, params }) => {
const [userId, updates] = params
const currentList = userList()
const [userId, updates] = params;
const currentList = userList();

const originalUserData = currentList.find((user) => user.id === userId);

if (!originalUserData) return;

const newUserData = { ...originalUserData, ...updates };

// Optimistic update
const optimisticList = currentList.map((user) =>
user.id === userId ? { ...user, ...updates } : user,
)
userList.set(optimisticList)
user.id === userId ? newUserData : user,
);
userList.set(optimisticList);

// Rollback on error
promise.catch(() => {
userList.set(currentList)
})
})
const currentUserData = userList().find((user) => user.id === userId);

// If user deleted or was changed do nothing
if (!currentUserData || currentUserData !== newUserData) return;

// Replace to original userData
userList.set((prev) =>
prev.map((user) => (user.id === userId ? originalUserData : user)),
);
});
});
```

### Manual Abort Control
Expand Down