spring-projects / spring-projects/spring-data-relational
Add support for `Window` scrolling queries
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- Dominant language
- Java
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Description
Hi there,
originally I was working with Spring for GraphQL when I stumbled upon this problem:
I wanted to perform a query with a Reactive Repository returning a windowed result, but it would complain about a "non unique result". Most likely because the return type of the Repsitory method is Mono<Window<Book>> (I need the Window for GraphQL), but the query itself returns several rows.
interface BookRepository : ReactiveCrudRepository<Book, Long>, ReactiveQueryByExampleExecutor<Book> {
fun findAllByOrderByName(example: Example<Book>, position: ScrollPosition): Mono<Window<Book>>
}
Am I missing something, or does Window not work in a Reactive context (yet)?
Find the attached source code with a Unit test to illustrate the problem.
reactive_window_query.zip
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Unpack reactive_window_query.zip and run the included unit test to reproduce the non-unique-result error. Trace the reactive repository query used by the test and make the windowed result work for multiple rows with a Mono<Window> return type. Done means the test passes without the error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java, spring
- Domain
- backend, database
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100