Add RenderingResponse.from

This commit introduces RenderingResponse.from(RenderingResponse),
allowing for easier response filtering.

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RenderingResponse.java

@@ -46,6 +46,20 @@ public interface RenderingResponse extends ServerResponse {
 
 	// Builder
 
+	/**
+	 * Create a builder with the template name, status code, headers and model of the given response.
+	 * @param other the response to copy the values from
+	 * @return the created builder
+	 */
+	static Builder from(RenderingResponse other) {
+		Assert.notNull(other, "'other' must not be null");
+		DefaultRenderingResponseBuilder builder = new DefaultRenderingResponseBuilder(other.name());
+		builder.status(other.statusCode());
+		builder.headers(other.headers());
+		builder.modelAttributes(other.model());
+		return builder;
+	}
+
 	/**
 	 * Create a builder with the given template name.
 	 * @param name the name of the template to render

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/RenderingResponseIntegrationTests.java

@@ -56,14 +56,9 @@ public class RenderingResponseIntegrationTests extends AbstractRouterFunctionInt
 		RouterFunction<RenderingResponse> normalRoute = route(GET("/normal"), handler::render);
 		RouterFunction<RenderingResponse> filteredRoute = route(GET("/filter"), handler::render)
 				.filter(ofResponseProcessor(
-						response -> {
-							Map<String, Object> model = new LinkedHashMap<>(response.model());
-							model.put("qux", "quux");
-
-							return RenderingResponse.create(response.name())
-									.modelAttributes(model)
-									.build();
-						}));
+						response -> RenderingResponse.from(response)
+								.modelAttribute("qux", "quux")
+								.build()));
 
 		return normalRoute.and(filteredRoute);
 	}