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OptimizelyUserContext for the Ruby SDK

Describes the OptimizelyUserContext object for the Ruby SDK, which allows you to make flag decisions and track events for a user context in Optimizely Feature Experimentation.

The OptimizelyUserContext object allows you to make flag decisions and track events for a user context that you have already created using the Create User Context method.

Also, if you have Real-Time Segments for Feature Experimentation configured between Optimizely Data Platform (ODP) and Optimizely Feature Experimentation enabled, you can evaluate if your user would qualify for a real-time audience segment.

OptimizelyUserContext minimum SDK version

OptimizelyUserContext is supported on SDK v3.8 and higher.

Forced decision methods minimum SDK version

set_forced_decision(), get_forced_decision(), remove_forced_decision() and remove_all_forced_decisions() methods are supported on v3.10.0 and higher.

Real-Time Segments for Feature Experimentation minimum SDK version

fetch_qualified_segments() and qualified_for?() methods are supported on v5.0.0 and higher.

OptimizelyUserContext definition

The following code shows the object definition for OptimizelyUserContext:

module Optimizely
  class OptimizelyUserContext

    attr_reader :user_id
    # Create an instance of the Optimizely User Context. Pass in user id and optionally user attributes 
    def initialize(optimizely_client, user_id, user_attributes)

    # set an attribute for the user
    def set_attribute(attribute_key, attribute_value)
    # get attributes for the user
    def user_attributes

    # make a decision about which flag variation the user buckets into for the flag key 
    def decide(key, options = nil)

    # make decisions about which flag variations the user buckets into for flag keys 
    def decide_for_keys(keys, options = nil)

    # make decisions about which flag variations the user buckets into for all flags 
    def decide_all(options = nil)

    # track user event
    def track_event(event_key, event_tags = nil)
    # OptimizelyDecisionContext
    OptimizelyDecisionContext =, :rule_key)
    # OptimizelyForcedDecision
    OptimizelyForcedDecision =

    # Sets the forced decision (variation_key) for a given decision context
    def set_forced_decision(context, decision)

    # Returns the forced decision for a given decision context
    def get_forced_decision(context)

    # Removes the forced decision for a given decision context
    def remove_forced_decision(context)

    # Removes all forced decisions bound to this user context
    def remove_all_forced_decisions
    # The following methods require Real-Time Segments for Feature Experimentation 
    # See note following the code sample.

    # An array of segment names that the user is qualified for. 
    # The result of **fetch_qualified_segments()** will be saved here. 
    # Can be nil if not properly updated with fetch_qualified_segments(). 
    # You can read and write directly to the qualified segments array. 
    # This allows for bypassing the remote fetching process from ODP 
    # or for utilizing your own fetching service.   
    def qualified_segments 
    # Fetch all qualified segments for the user context.
    # If no callback is provided, this method will fetch the qualified segments
    # and return a boolean signifying success.
    # If a callback is provided, the method will fetch segments in a separate thread, 
    # invoke the provided callback when results are available, and return the thread handle. 
    def fetch_qualified_segments(options, &block) 
    # Check is the user qualified for the given segment. 
    def qualified_for?(segment)




You must first configure Real-Time Segments for Feature Experimentation to run thequalified_segments(), fetch_qualified_segments(), and qualified_for?() methods.


The following table shows attributes for the OptimizelyUserContext object:

user_idStringThe ID of the user
(optional) attributesMapA map of custom key-value pairs specifying attributes for the user that are used for audience targeting. You can pass the map with the user ID when you create the user.


The following table shows methods for the OptimizelyUserContext object:

set_attributePass a custom user attribute as a key-value pair to the user context.
decideReturns a decision result for a flag key for a user in an OptimizelyDecision object, which contains all data required to deliver the flag rule.
See Decide methods
decide_for_keysReturns a map of flag decisions for specified flag keys.
See Decide methods
decide_allReturns decisions for all active (unarchived) flags for a user.
See Decide methods
track_eventTracks a conversion event for a user (an action a user takes) and logs an error message if the specified event key does not match any existing events.
See Track Event
set_forced_decisionForces a user into a specific variation.
See Set Forced Decision
get_forced_decisionReturns what variation the user was forced into.
See Get Forced Decision
remove_forced_decisionRemoves a user from a specific forced variation.
See Remove Forced Decision
remove_all_forced_decisionsRemoves a user from all forced variations.
See Remove All Forced Decisions
fetch_qualified_segments **Fetch all Optimizely Data Platform (ODP) real-time segments that the user context qualified for. See Real-Time Segments for Feature Experimentation segment qualification methods.
qualified_for? **Check if the user context qualified for a given ODP real-time segment. See Real-Time Segments for Feature Experimentation segment qualification methods.

** Requires Real-Time Segments for Feature Experimentation.

See Also

Create User Context

Source files

The language and platform source files containing the implementation for Ruby are available on