Filter

Definition

A filter, in Reflag, is a mechanism that is used to check if entities such as user, company, event, etc. match a set of predicates. Filters can also be aggregated into logical expressions, thus, facilitating advanced use cases.

Reflag supports the following filter types:

• Company attribute filter, that can be used to check company attributes,

• Company flag metrics filter, which allows checking flag metrics for a given company,

• User attribute filter, used to check user attributes,

• Event attribute filter, used to check event attributes,

• Company segment filter, can be used to check a company's membership in a segment,

• Flag access filter, can be used to check whether a company has access to a flag,

• Gradual rollout filter, is used in advanced scenarios to evaluate whether a company matches a rollout bracket,

• Other context filter, used when rules can access additional context, in addition to user and company attributes.

Company attribute filter

This filter can be used to check company attributes against a set of predicates. The attributes include First seen and Last seen, which are maintained by Reflag. You can use any attribute name that your application sends to Reflag.

Company flag metrics

This filter allows checking company-level flag metrics. These metrics include Event count, First used, Last used, and more.

User attribute filter

This filter can be used to check user attributes against a set of predicates. You can use any attribute name that your application sends to Reflag when updating a user.

Event attribute filter

This filter can be used to check event attributes against a set of predicates. You can use any attribute name that your application sends to Reflag when sending track events.

Company segment filter

This filter can be used to check if a given company is (or not) included in a given segment. The filter essentially evaluates the segment's filter against the company.

Flag access filter

This filter can be used to check if a given company has access to a given flag. The filter evaluates the flag's targeting rules against the provided company and skips any non-company attribute filters.

Gradual rollout filter

This filter is used by flag access targeting when enabling gradual rollout. It brackets the pool of companies with a predictable hashing algorithm and checks whether the company falls within the rollout percentage.

Other context filter

This filter can be used to check other context attributes against a set of predicates. You can use any attribute name that your application sends to Reflag when evaluating flag access.

• Company attribute filters using First seen and Last seen attributes cannot be used in targeting rules,

• Company flag metrics filters are not supported in targeting rules,

• Event attribute filter is only used in event-based flags and automatic feedback surveys,

• Gradual rollout filter is only used in flag access targeting rules,

• Other context filter is only used in flag access targeting rules,

Any filters that build on other filters inherit the restrictions of the filters they are based on.

Next steps

• Learn in depth how to use filters in setting up flag access rules.