# Avoiding satisfiability errors with entities - The Weekly Wisdom - Edition #10 **URL:** \ **Category:** Weekly Wisdom\ **Tags:** odyssey, connectors, weekly-wisdom\ **Created:** [July 9, 2025, 10:35pm UTC](https://community.apollographql.com/t/avoiding-satisfiability-errors-with-entities-the-weekly-wisdom-edition-10/9284 "2025-07-09T22:35:23Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Michelle\_Mabuyo](https://sea1.discourse-cdn.com/flex019/user_avatar/community.apollographql.com/michelle_mabuyo/32/80_2.png) [@Michelle\_Mabuyo](https://community.apollographql.com/u/Michelle_Mabuyo)\ **Post date:** [July 9, 2025, 10:35pm UTC](https://community.apollographql.com/t/avoiding-satisfiability-errors-with-entities-the-weekly-wisdom-edition-10/9284/1 "2025-07-09T22:35:23Z")
![Topic Banner Post (1)](https://us1.discourse-cdn.com/flex019/uploads/apollographql/original/2X/5/51257e731f89f3af33bd8f41983ea63aa53855f9.png) ### 🎓 Welcome to The Weekly Wisdom 🗓 **Edition #10 - 10 Jul 2025** 🏷 **Topic tags - #connectors #odyssey** 🔔 **Stay in the loop: Subscribe to the “The Weekly Wisdom” category to get notified when new posts drop—no FOMO here.** * * * Hey all! 👋 @Michelle_Mabuyo here from the Apollo Education team. I’m a Developer Educator and I build courses for Odyssey, our official learning platform. I’m back for the next edition of a multi-part series to teach you the basics of **Apollo Connectors** : a powerful way to bring existing **REST APIs** into your graph, all through configuration in the schema. ### 💡This week’s learning: Avoiding satisfiability errors with entities In many APIs, different endpoints can return different subsets of the same object. A list endpoint may return just IDs and titles, while a detailed endpoint includes descriptions, coordinates, images, and more. In the example below, `featuredListings` returns a list of `listings`, whereas listing returns detailed information about a specific listing. ![](https://us1.discourse-cdn.com/flex019/uploads/apollographql/original/2X/0/0a41fc3db3ce6b2a930084251b617b842334adee.jpeg) So when a client requests everything through a list query, the router can’t figure out where to get those extra fields, resulting in the dreaded `SATISFIABILITY_ERROR`. Enter: entities. By marking a type with @key and assigning a Connector to that type, you give the router a roadmap. It knows how to fetch additional data to complete a query, even if the original endpoint couldn’t satisfy everything. That’s orchestration in action! No more satisfiability errors. Just satisfied queries. ✨ * * * ### 🔎 Want to go deeper? You’ll see this in action in the Odyssey tutorial **[“GraphQL meets REST with Apollo Connectors (Lesson 9)”](https://www.apollographql.com/tutorials/connectors-intro-rest/09-entities)**, where we use entities to enrich listing data and avoid schema build failures. **[Take the course](https://www.apollographql.com/tutorials/connectors-intro-rest)** * * * ### 💬 Share your thoughts in the thread below ⬇ Have you encountered satisfiability errors before? How did you debug them? ---
**Author:** ![Chauntay\_Lawson](https://sea1.discourse-cdn.com/flex019/user_avatar/community.apollographql.com/chauntay_lawson/32/5424_2.png) [@Chauntay\_Lawson](https://community.apollographql.com/u/Chauntay_Lawson)\ **Post date:** [July 9, 2025, 10:35pm UTC](https://community.apollographql.com/t/avoiding-satisfiability-errors-with-entities-the-weekly-wisdom-edition-10/9284/2 "2025-07-09T22:35:34Z")
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**Author:** ![Chauntay\_Lawson](https://sea1.discourse-cdn.com/flex019/user_avatar/community.apollographql.com/chauntay_lawson/32/5424_2.png) [@Chauntay\_Lawson](https://community.apollographql.com/u/Chauntay_Lawson)\ **Post date:** [July 10, 2025, 4:07pm UTC](https://community.apollographql.com/t/avoiding-satisfiability-errors-with-entities-the-weekly-wisdom-edition-10/9284/3 "2025-07-10T16:07:13Z")
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**Author:** ![Chauntay\_Lawson](https://sea1.discourse-cdn.com/flex019/user_avatar/community.apollographql.com/chauntay_lawson/32/5424_2.png) [@Chauntay\_Lawson](https://community.apollographql.com/u/Chauntay_Lawson)\ **Post date:** [July 10, 2025, 4:07pm UTC](https://community.apollographql.com/t/avoiding-satisfiability-errors-with-entities-the-weekly-wisdom-edition-10/9284/4 "2025-07-10T16:07:48Z")