How to use contexts instead of alias

Affected: All SDKs

Overview

Before an end-user context logs in, they may represent a certain context kind with different attributes. After they login, they may be represented by additional contexts, each with unique keys. 

To associate two or more contexts together for a consistent experience between end-user states and for experimentation purposes, use a multi-context in each of your variation , identify, and track calls.

Solution

1. Evaluate the anonymous context by calling variation before logging in:

const anon_context = {
"kind": "anonContext",
"key": "context-key-123abc",
"anonymous": true
}
const client = LDClient.initialize('client-side-id-123abc', anon_context);
client.variation(my-flag, false)

const logged_in_context = {
"kind": "loggedInContext",
"key": "context-key-456def",
"plan": "platinum",
"active": true,
"country": "australia"
}

const multi_context_user = {
"kind": "multi",
anon_context,
logged_in_context
}
ldclient.identify(multi_context_user)

4. Call identify and variation moving forward with the multi context to ensure a seamless variation experience for the context.

5. If using the Experimentation feature, set the Randomization unit as anonContext and also in the associated metric to ensure a consistent experience between anonymous and logged-in states and accurate Experiment results.

Resources