`@ModelAttribute(binding=false)` is not honored with WebFlux

[johnyannj]

Given...

public class User {
    private String name;

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

And...

@RestController
public class DemoController {

    @GetMapping("/hello")
    public Mono<String> hello(@ModelAttribute(binding = false) User user) {
        return Mono.just(user.getName());
    }
}

... when I call http://localhost:8080/hello?name=xxxx , I get "xxxx" for WebFlux but "" for Web MVC.

[sbrannen]

Thanks for raising your first issue against the Spring Framework!

It appears that we may need to add a check to org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.resolveArgument(MethodParameter, BindingContext, ServerWebExchange) to honor the binding attribute in @ModelAttribute.

We will investigate our options.

[sbrannen]

Current work on this can be viewed here: main...sbrannen:issues/gh-26856-ModelAttribute-binding-false-WebFlux