DATAREST-762 - Collection resource's base link now forwards parameters.

We now use the current request's URI as base link for all links created for a collection resource. This especially has effect in the creation of pagination links as we now carry potentially applied critierias (induced by our Querydsl based filtering support) forward to the navigation links generated.

spring-data-rest-tests/spring-data-rest-tests-mongodb/src/test/java/org/springframework/data/rest/tests/mongodb/MongoWebTests.java

@@ -22,9 +22,12 @@ import static org.springframework.test.web.servlet.request.MockMvcRequestBuilder
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
 
 import java.math.BigDecimal;
+import java.net.URI;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Stream;
 
 import org.assertj.core.api.Condition;
 import org.junit.After;
@@ -38,10 +41,14 @@ import org.springframework.data.rest.webmvc.support.RepositoryEntityLinks;
 import org.springframework.hateoas.IanaLinkRelations;
 import org.springframework.hateoas.Link;
 import org.springframework.hateoas.LinkRelation;
+import org.springframework.hateoas.TemplateVariable;
+import org.springframework.hateoas.TemplateVariable.VariableType;
+import org.springframework.hateoas.client.LinkDiscoverer;
 import org.springframework.http.MediaType;
 import org.springframework.mock.web.MockHttpServletResponse;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
+import org.springframework.web.util.UriComponents;
 import org.springframework.web.util.UriComponentsBuilder;
 
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
@@ -400,4 +407,36 @@ public class MongoWebTests extends CommonWebTests {
 		mvc.perform(get(mapLink.expand().getHref()).accept(TEXT_URI_LIST)) //
 				.andExpect(status().isUnsupportedMediaType());
 	}
+
+	@Test // DATAREST-762
+	public void paginatedLinksContainQuerydslPropertyReferences() throws Exception {
+
+		Map<String, Object> parameters = new HashMap<>();
+		parameters.put("page", "0");
+		parameters.put("size", "1");
+		parameters.put("firstname", "a");
+
+		Link receipts = client.discoverUnique("users");
+		URI firstnameLikeA = receipts.getTemplate() //
+				.with(new TemplateVariable("firstname", VariableType.REQUEST_PARAM)) //
+				.expand(parameters);
+
+		MockHttpServletResponse response = mvc//
+				.perform(get(firstnameLikeA)) //
+				.andReturn() //
+				.getResponse();
+
+		LinkDiscoverer discoverer = client.getDiscoverer(response);
+		String content = response.getContentAsString();
+
+		Stream.of(IanaLinkRelations.FIRST, IanaLinkRelations.NEXT, IanaLinkRelations.LAST) //
+				.forEach(it -> {
+
+					Link firstLink = discoverer.findRequiredLinkWithRel(it, content);
+					UriComponents components = UriComponentsBuilder.fromUriString(firstLink.getHref()).build();
+
+					assertThat(components.getQueryParams().containsKey("firstname"));
+				});
+
+	}
 }