Question 1

How to set up Sangria with akka-http?

Accepted Answer

The README links to an example application using akka-http with Sangria. You'll need to include Sangria and akka-http dependencies, define your GraphQL schema, and use the execution engine to handle HTTP requests, typically via route definitions.

Question 2

Sangria vs caliban: which GraphQL library is better for Scala?

Accepted Answer

Sangria is a mature, spec-compliant library with extensive integrations and type-safe DSL, ideal for teams leveraging Scala's OOP features. Caliban is newer and more functional, offering a different approach; choose Sangria for broader ecosystem support or caliban for functional programming preferences.

Question 3

How to handle authentication in Sangria GraphQL?

Accepted Answer

Sangria supports authentication through middleware or context passing; you can implement custom logic in the execution context or field resolvers to validate user permissions based on request data, often integrating with web framework security.

Question 4

Does Sangria support GraphQL subscriptions?

Accepted Answer

Yes, Sangria supports subscriptions as part of the GraphQL spec, but real-time implementation depends on your web framework (e.g., akka-http streams or Play WebSockets) and may require additional configuration for handling persistent connections.

Question 5

What are the performance benchmarks for Sangria?

Accepted Answer

Performance is generally robust due to Scala and JVM optimizations, but complex schemas or high query volumes might require tuning, such as efficient resolver functions and caching strategies, as there are no built-in performance guarantees in the library.

Question 6

How to use Sangria macros to reduce boilerplate?

Accepted Answer

Sangria provides macros like `graphql` for query parsing and schema construction macros; refer to the documentation for examples on simplifying repetitive code in schema definitions and query execution, as hinted in the Hello World snippet.

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