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Scene with key considered non-existent despite it rendering successfully #1040

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casenjo opened this issue Aug 9, 2016 · 8 comments
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@casenjo
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casenjo commented Aug 9, 2016

Version

Tell us which versions you are using:

  • react-native-router-flux v3.33.2
  • react-native v0.29.0

Expected behaviour

The scene key should be found when the state of the app changes

Actual behaviour

I have the following code for my app:

<Router>
  <Scene
    key = "root"
    hideNavBar = {true}
    direction = "vertical"
    component = { connect(state => ({ auth: state.auth, isOnboarding: state.verify.isOnboarding }))(Switch) }
    tabs = {true}
    unmountScenes
    selector = {props => (props.auth.token !== '' && props.isOnboarding == 0) ? "loggedIn" : "loggedOut"}
  >
    <Scene key = "loggedOut" hideNavBar = {true} type = {ActionConst.RESET} direction = "vertical" >
      <Scene key = "login" component = {LoginContainer} passProps = {true} direction = "vertical" />
    </Scene>
    <Scene key = "loggedIn" hideNavBar = {true} type = {ActionConst.RESET} direction = "vertical" >
      <Scene key = "productList" component = {ProductListContainer} passProps = {true} direction = "vertical" type = {ActionConst.RESET} />
    </Scene>
  </Scene>
</Router>

When the app is initially installed in the simulator, the loggedOut scene works great. After the login scene is completed (and auth.token and isOnboarding have the relevant values), the transition to loggedIn works great as well. When the token is cleared, however, I get the following screen:

screen shot 2016-08-09 at 12 38 41 pm

And when I press Cmd+R, the app refreshes, and only then does it go back to showing the loggedOut scene properly.

I'm not sure what is triggering this error, since the initial render of the loggedOut scene works fine.

@aksonov
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aksonov commented Aug 9, 2016

Maybe it is bug within umountScenes? Could you check without unmountScenes?

On 09 Aug 2016, at 21:52, Cristian Asenjo [email protected] wrote:

Version

Tell us which versions you are using:

react-native-router-flux v3.33.2
react-native v0.29.0
Expected behaviour

The scene key should be found when the state of the app changes

Actual behaviour

I have the following code for my app:

({ auth: state.auth, isOnboarding: state.verify.isOnboarding }))(Switch) } tabs = {true} unmountScenes selector = {props => (props.auth.token !== '' && props.isOnboarding == 0) ? "loggedIn" : "loggedOut"}
<Scene key = "loggedOut" hideNavBar = {true} type = {ActionConst.RESET} direction = "vertical" >
  <Scene key = "login" component = {LoginContainer} passProps = {true} direction = "vertical" />
</Scene>
<Scene key = "loggedIn" hideNavBar = {true} type = {ActionConst.RESET} direction = "vertical" >
  <Scene key = "productList" component = {ProductListContainer} passProps = {true} direction = "vertical" type = {ActionConst.RESET} />
</Scene>
When the app is initially installed in the simulator, the loggedOut scene works great. After the login scene is completed (and auth.token and isOnboarding have the relevant values), the transition to loggedIn works great as well. When the token is cleared, however, I get the following screen:

https://cloud.githubusercontent.com/assets/1554289/17530875/4eee79b6-5e2e-11e6-93b5-9d776f83e22e.png
And when I press Cmd+R, the app refreshes, and only then does it go back to showing the loggedOut scene properly.

I'm not sure what is triggering this error, since the initial render of the loggedOut scene works fine.


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@casenjo
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casenjo commented Aug 9, 2016

Just checked and unfortunately got the same result :(
Are there any specific things that I could log to help narrow down the issue?

@steida
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steida commented Aug 10, 2016

connect(state => ({ auth: state. inside render function a big design smell, try to refactore out it.

@casenjo
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casenjo commented Aug 10, 2016

@steida I agree, I need to clean that up. I want to get it working properly first though ;)

@steida
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steida commented Aug 10, 2016

Properly? It's terribly wrong ;). Please fix it and retest code.

@casenjo
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casenjo commented Aug 10, 2016

Do you really believe that's the issue, and if so, can you explain why? I'd like to learn because I don't really understand why that's the case, and it's the exact example that's provided in the docs.
https://github.com/aksonov/react-native-router-flux/blob/master/docs/OTHER_INFO.md#switch-new-feature

@mlevkovsky
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+1 on this

@casenjo
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casenjo commented Sep 1, 2016

As @steida suggested, I cleaned the code up a little more and turned the component into a full on smart component like this:

class App extends Component {
  constructor(props) {
    super(props);
  }

  render() {
    return (
    <Router>
      <Scene
        key = "root"
        hideNavBar = {true}
        component = { connect(mapStateToProps)(Switch) } // EDIT 1
        direction = "vertical"
        tabs = {true} // Enabled in order to switch between loggedIn/loggedOut
        unmountScenes // Make sure that when we switch between scenes the other ones are unmounted
        selector = {props => (props.auth.token !== '' && props.isOnboarding == 0) ? "loggedIn" : "loggedOut"} // Conditional to decide what to render
      >
        {require("./components/sceneGroups/loggedOut")}
        {require("./components/sceneGroups/loggedIn")}
      </Scene>
    </Router>
    )
  }
}

const mapStateToProps = (state) => {
  const auth = state.auth;
  const isOnboarding = state.verify.isOnboarding;

  return {
    auth,
    isOnboarding,
  };
}

const mapDispatchToProps = (dispatch) => {
  return { };
};

export default connect(mapStateToProps, mapDispatchToProps)(App);

And that fixed the issue, though I still don't understand why that fixed it. Thanks @steida! (Spoke too soon, it didn't :( See edit 1)
I still want to understand why the example in the wiki wasn't working but converting it to use mapStateToProps did the trick. @aksonov would you be able to chime in?

Edit 1: Initially the issue was fixed, and then I noticed that upon refreshing the app the proper scene wasn't being loaded. I added the component part to it and connected it with mapStateToProps and I'm back to getting the same error as before :S

aksonov added a commit that referenced this issue Jul 8, 2017
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V4 announcement, v3 is obsolete now.
@aksonov aksonov closed this as completed in 97e89ae Jul 8, 2017
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