sangria-graphql/sangria

[Feature Request] flatMap over DeferredValue

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#629 opened on May 3, 2021

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help wanted

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Description

Having map accessible on a DeferredValue is already very useful but I'd like to also have flatMap available so I can return another DeferredValue based on the result of the later and return it's subsequent value. I think there would be some overlap with the Relation-based mechanics but I think adding flatMap would add more ergonomics to dealing with DeferredValues.

Contributor guide

Research direction
Look at the existing 'map' implementation on DeferredValue in the source code. Understand the DeferredValue trait and how it composes. Implement 'flatMap' similarly, ensuring it returns a DeferredValue that wraps the result of applying the function to the inner value. Write tests following existing patterns.
Tech stack
scala
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Scala
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70