# \#rebac

**URL:** https://community.auth0.com/tag/rebac/1613.md

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## [B2B SaaS Identity Challenges: Granular Access Control](https://community.auth0.com/t/b2b-saas-identity-challenges-granular-access-control/188224)

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**Author:** [@andrea.chiarelli](https://community.auth0.com/u/andrea.chiarelli)\
**Replies:** 1\
**Last updated:** [June 20, 2025, 4:19pm UTC](https://community.auth0.com/t/b2b-saas-identity-challenges-granular-access-control/188224 "2025-06-20T16:19:53Z")

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Let’s continue to delve into the issues of Identity support in implementing B2B SaaS applications by exploring access control in this second article of the “B2B SaaS Identity Challenges” series.

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## [How to Implement Relationship-Based Access Control (ReBAC) in a Ruby On Rails API?](https://community.auth0.com/t/how-to-implement-relationship-based-access-control-rebac-in-a-ruby-on-rails-api/181517)

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**Author:** [@robertino.calcaterra](https://community.auth0.com/u/robertino.calcaterra)\
**Replies:** 1\
**Last updated:** [February 5, 2025, 5:35pm UTC](https://community.auth0.com/t/how-to-implement-relationship-based-access-control-rebac-in-a-ruby-on-rails-api/181517 "2025-02-05T17:35:30Z")

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The way to implement an authorization system depends on your application’s needs. Let’s explore Relationship-Based Access Control (ReBAC) and implement it in a Rails API using OpenFGA. Read more… :writing\_hand:t2: Brou…

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## [How To Evaluate Resource-Specific Permissions Efficiently with ReBAC instead of RBAC](https://community.auth0.com/t/how-to-evaluate-resource-specific-permissions-efficiently-with-rebac-instead-of-rbac/170130)

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**Author:** [@robertino.calcaterra](https://community.auth0.com/u/robertino.calcaterra)\
**Replies:** 1\
**Last updated:** [January 24, 2025, 7:19pm UTC](https://community.auth0.com/t/how-to-evaluate-resource-specific-permissions-efficiently-with-rebac-instead-of-rbac/170130 "2025-01-24T19:19:40Z")

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Learn how the ReBAC authorization model overcomes RBAC when it comes to evaluate permissions on a specific resource. Read more… :writing\_hand:t2: Brought to you by @tylernix