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[dabeeeenster]

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[khirod-dev]

I am recently started to look into Bullet Train . i had few questions
1> when we change any feature value in Bullet Train will that auto pushed to UI ? or only on UI refresh the new value will be fetched via API ?
2> when we define a segment ( let's say i have that defined based on user businessUint, Employee-Id) , in Bullet Train . Now when user logs in to My application ,How do I send those values to BulletTrain that I can get the feature value for that user details.

[dabeeeenster]

Hi @khirodAsurion

1. You would need to refresh your UI / make another call to getFlags() to retrieve the new flag values.
2. You define Traits against an Identity (https://docs.flagsmith.com/managing-identities/#identity-traits)

[khirod-dev]

Thanks @dabeeeenster .That helped . While I was trying to identify a user and set a trait i see fowling error :

**Attempted to setTrait a user before calling flagsmith.init. Call flagsmith.init first, if you wish to prevent it sending a request for flags, call init with preventFetch:true**.

any idea ?

import flagsmith from "flagsmith"; 
flagsmith.identify("user_123457"); // This will create a user in the dashboard if they don't already exist

flagsmith.setTrait("age", 21);
flagsmith.incrementTrait("age", -1);
flagsmith.init({
  environmentID:"mTsSYnjxfkDUYKTYHqMdwx",
  api:"http://localhost:8000/api/v1/",
  onChange: (oldFlags, params) => { // Occurs whenever flags are changed

      const { isFromServer } = params; // Determines if the update came from the server or local cached storage

      // Check for a feature
      if (flagsmith.hasFeature("intl_shipping")) {
          console.log("got feature")
      }

      // Or, use the value of a feature
      const intl_shipping = flagsmith.getValue("intl_shipping");
      console.log('intl_shipping =>',intl_shipping )
      const age = flagsmith.getTrait("age");
      console.log('age trait',age);
      // Check whether value has changed
      const intl_shipping_Old = oldFlags["intl_shipping"] && oldFlags["intl_shipping"].value;
      console.log('intl_shipping_Old =>',intl_shipping_Old )
      if (intl_shipping !== intl_shipping_Old) {
          // Value has changed, do something here
          console.log('intl_shipping =>',intl_shipping , 'value changed')
      }
  }
});

[dabeeeenster]

You need to flagsmith.init before flagsmith.setTrait or flagsmith.incrementTrait .

[khirod-dev]

Thank you . @dabeeeenster
So when so see the docs for creating traits the sample code shows the way I have here . So, do the docs need an update ?
And my 2nd question :- anywhere during the application flow we should be able to set the trait on some use behavior, does that mean before I setTrait always call init and then set. even if I am doing at 3,4 different places during app flow ?

[dabeeeenster]

Ok thanks for the feedback - this example is updated