@PatchMapping
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Internal
Overview
The annotation may also contain a sub-path relative to the class-level base path, usually configured with @RequestMapping.
REST
@RestController
@RequestMapping(path = "/a", produces = "application/json")
public class AController {
@PatchMapping(path = "/{id}", consumes = "application/json")
public ResponseEntity<A> patch(@PathVariable("id") Integer id, @RequestBody A a) {
A current = content.get(id);
if (current == null) {
return new ResponseEntity<>(null, HttpStatus.NOT_FOUND);
}
if (a.getName() != null) {
current.setName(a.getName());
}
...
return new ResponseEntity<>(current, HttpStatus.OK);
}
}
For possible problems related to @RequestBody and deserialization from JSON, see:
HTTP POST Semantics for REST Applications
Patching Semantics
The above implementation has limitations: if null values are meant to specify change, how the client should indicate that a filed should be set to null. Also, collections can only be replaced in bulk, there is no way of adding or removing a subsets of items from a collection. TODO, more here.