Getting the user in the rootcomponent

I specified the rootComponent for my client:

client: {
    rootComponent: import Root from "@src/client/Root",
  }

client: {
    rootComponent: import Root from "@src/client/Root",
  }

In my Root.tsx I want to check if the user is logged in, so I can check which menu items to show:

const links: { link: Routes, label: string }[] = [
  { link: routes.RootRoute, label: 'Home' },
  { link: routes.ClassRoute, label: 'Class' },
  { link: routes.CourseRoute, label: 'Course' },
];

export default function Root({ user, children }: { user: AuthUser, children: React.ReactNode }) {
  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

const links: { link: Routes, label: string }[] = [
  { link: routes.RootRoute, label: 'Home' },
  { link: routes.ClassRoute, label: 'Class' },
  { link: routes.CourseRoute, label: 'Course' },
];

export default function Root({ user, children }: { user: AuthUser, children: React.ReactNode }) {
  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

This does not work. Even if the user is logged in, the Header only shows this button: <NavLink to='/login'><Button size="s">Login</Button></NavLink> Is it possible to access the user in the rootComponent?

11 Replies

kapa.ai•4mo ago

Hi @procrastinator_bas. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- In Wasp, the user prop is only available in a page's React component when authRequired is set to true in the page's declaration. Therefore, you cannot directly access the user prop in the root component. However, you can use the useAuth hook provided by Wasp to access the logged-in user's data in any React component, including the root component. Here is how you can use the useAuth hook in your Root component:

import { useAuth, logout } from 'wasp/client/auth'

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth()

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

import { useAuth, logout } from 'wasp/client/auth'

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth()

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

In the above code, useAuth is used to get the logged-in user's data. If the user is not logged in, user will be undefined, and only the Login button will be shown. If the user is logged in, user will contain the user's data, and the other menu items and the Logout button will be shown. For more information, you can refer to the Wasp documentation on accessing the logged-in user (https://wasp-lang.dev/docs/auth/overview#accessing-the-logged-in-user). ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @procrastinator_bas, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

procrastinator_basOP•4mo ago

@kapa.ai If the user is not loggedIn, what will be the value of user?

MEE6•4mo ago

Wohooo @procrastinator_bas, you just became a Waspeteer level 1!

kapa.ai•4mo ago

Let me check the knowledge base for you. One moment! :books: ---------------------- If the user is not logged in, the user value obtained from the useAuth hook will be undefined. This is because the useAuth hook returns the logged-in user's data, and if no user is logged in, there is no data to return. Here is the relevant code snippet:

const { data: user } = useAuth()

const { data: user } = useAuth()

In this code, useAuth is a hook provided by Wasp that returns an object with a data property. If a user is logged in, data will contain the user's data. If no user is logged in, data will be undefined. For more information, you can refer to the Wasp documentation on using the useAuth hook (https://wasp-lang.dev/docs/auth/overview#using-the-useauth-hook). ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @procrastinator_bas, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

Filip•4mo ago

Nice try @kapa.ai, but that's not quite right. If data is equal to: - null - it means "no one is logged in" - User - it means "this is the data of the logged in user" - undefined - it means "this is the first render, I'll update data as soon as I fetch it. @procrastinator_bas Are you maybe using typescript? If so, hover over useQuery and check the type 🙂

kapa.ai•4mo ago

Let me check the knowledge base for you. One moment! :books: ---------------------- I apologize for the confusion. You're correct. When using the useAuth hook in Wasp: - If data is null, it means no one is logged in. - If data is a User object, it means this is the data of the logged-in user. - If data is undefined, it means this is the first render, and the data will be updated as soon as it's fetched. Here's how you can use the useAuth hook in your Root component:

import { useAuth, logout } from 'wasp/client/auth'

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth()

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

import { useAuth, logout } from 'wasp/client/auth'

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth()

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

In this code, useAuth is used to get the logged-in user's data. If the user is not logged in, user will be null, and only the Login button will be shown. If the user is logged in, user will contain the user's data, and the other menu items and the Logout button will be shown. For more information, you can refer to the Wasp documentation on accessing the logged-in user (https://wasp-lang.dev/docs/auth/overview#accessing-the-logged-in-user). ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @sodic, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

procrastinator_basOP•4mo ago

@sodic I am using Typescript. If I hover over useAuth it shows me the UseQueryResult<AuthUser | null> type. I'm guessing AuthUser will be undefined at first render? @kapa.ai Your code gives me a typescript error on this part: <Header user={user} /> I needed to change the type of user to AuthUser | null | undefined to get it to work.

kapa.ai•4mo ago

Let me check the knowledge base for you. One moment! :books: ---------------------- Yes, you're correct. The useAuth hook returns a UseQueryResult<AuthUser | null> type. This means that the user data can be an AuthUser object, null, or undefined. - AuthUser object: This is the data of the logged-in user. - null: This means no one is logged in. - undefined: This means this is the first render, and the data will be updated as soon as it's fetched. So, when defining the user prop in your Header component, you should indeed account for all these possible types. Here's how you can do it:

function Header({ user }: { user: AuthUser | null | undefined }) {
  // ...
}

function Header({ user }: { user: AuthUser | null | undefined }) {
  // ...
}

And when you're using the Header component in your Root component:

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth()

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>
  )
}

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth()

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>
  )
}

This way, you're correctly typing the user prop to match the type returned by the useAuth hook, which should resolve the TypeScript error. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @procrastinator_bas, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

Filip•4mo ago

If I hover over useAuth it shows me the UseQueryResult<AuthUser | null> type.

This is indeed the correct type.

I'm guessing AuthUser will be undefined at first render?

That's right - it's how react-query works .

Your code gives me a typescript error on this part: <Header user={user} />

I'm guessing you're referring to Kapa's code. The bot messes it up sometimes. .

I needed to change the type of user to AuthUser | null | undefined to get it to work.

The type of user is alreadyAuthUser | null | undefined because:

UseQueryResult<T> = T | undefined // roughly
UseQueryResult<AuthUser | null> = (AuthUser | null) | undefined = AuthUser | null | undefined

UseQueryResult<T> = T | undefined // roughly
UseQueryResult<AuthUser | null> = (AuthUser | null) | undefined = AuthUser | null | undefined

So, what did you mean by "I have to change the type of user to AuthUser | null | undefined?" It should already have that exact type. Can you share the code? I think it's enough to just check if (!user) { return "No user" } after the useAuth call and the rest of the component shouldn't complain

procrastinator_basOP•4mo ago

I'm sorry, I meant in the props for the Header function. Here is my code:

import React from "react"
import '@mantine/core/styles.css';
import { MantineProvider, Button } from '@mantine/core';
import { Container, Group, Burger } from '@mantine/core';
import classes from './HeaderSimple.module.css';
import { logout, useAuth } from "wasp/client/auth";
import { Routes, routes } from "wasp/client/router";
import { NavLink } from "react-router-dom";
import { AuthUser } from "wasp/auth";

const links: { link: Routes, label: string }[] = [
  { link: routes.RootRoute, label: 'Home' },
  { link: routes.ClassRoute, label: 'Class' },
  { link: routes.CourseRoute, label: 'Course' },
];

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth();
  
  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser | null | undefined }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

import React from "react"
import '@mantine/core/styles.css';
import { MantineProvider, Button } from '@mantine/core';
import { Container, Group, Burger } from '@mantine/core';
import classes from './HeaderSimple.module.css';
import { logout, useAuth } from "wasp/client/auth";
import { Routes, routes } from "wasp/client/router";
import { NavLink } from "react-router-dom";
import { AuthUser } from "wasp/auth";

const links: { link: Routes, label: string }[] = [
  { link: routes.RootRoute, label: 'Home' },
  { link: routes.ClassRoute, label: 'Class' },
  { link: routes.CourseRoute, label: 'Course' },
];

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth();
  
  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser | null | undefined }) {
  const items = links.map((link) => (
    <NavLink to={link.link.to}>
      <Button key={link.label}>{link.label}</Button>
    </NavLink>
  ));

  return (
    <header className={classes.header}>
      <Container size="md" className={classes.inner}>
        <h1>Teachers tools</h1>
        <Group gap={5} visibleFrom="xs">
          {user && items}
          {user && <Button size="s" onClick={logout}>Logout</Button>}
          {!user && <NavLink to='/login'><Button size="s">Login</Button></NavLink>}
        </Group>
      </Container>
    </header>
  );
}

Filip•4mo ago

Oh, I see. I think it's better if you did this:

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth();
  
  
  if (!user) {
    return // handle what happens if the user isn't logged in
  }
  // after this, TypeScript knows the user isn't null or undefined, so no problem!

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  // ...
}

export default function Root({ children }: { children: React.ReactNode }) {
  const { data: user } = useAuth();
  
  
  if (!user) {
    return // handle what happens if the user isn't logged in
  }
  // after this, TypeScript knows the user isn't null or undefined, so no problem!

  return (
    <MantineProvider>
      <Header user={user} />
      {children}
    </MantineProvider>)
}

function Header({ user }: { user: AuthUser }) {
  // ...
}

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Getting the user in the rootcomponent