How to use List in endpoint exported by Spring Data REST?

问题

I have 2 objects, Foo and Bar (a Foo is @ManyToOne with Bar), and a very basic repository interface in Spring Boot 2.0, and a method:

   List<Foo> findByBarIn(@Param("bar") List<Bar> bar);

This gets mapped by Spring to an endpoint called /foos/search/findByBarIn

I can specify a single bar doing something like

GET http://host/foos/search/findByBarIn?bar=http://host/bars/33 (where 33 is the ID the of the Bar entity)

But, how can I specify multiple bars?

I've tried: (with no success)

GET http://host/foos/search/findByBarIn?bar=http://host/bars/33,http://host/bars/44

GET http://host/foos/search/findByBarIn?bar=http://host/bars/33&bar=http://host/bars/44

回答1:

I've found out how to do it:

So, this prototype didn't work:

List<Foo> findByBarIn(@Param("bar") List<Bar> bars);

but this does:

List<Foo> findByBarIn(@Param("bar") Bar... bars);

And then, I can specify multiple bars by:

GET http://host/foos/search/findByBarIn?bar=http://host/bars/33&bar=http://host/bars/44

来源：https://stackoverflow.com/questions/48489674/how-to-use-list-in-endpoint-exported-by-spring-data-rest