Requested fields on super resource type are now taken into account.

* Update DocumentMapperUtil.getRequestedFields to read requested fields
  on super type.
* Add test case.

crnk-core/src/main/java/io/crnk/core/engine/internal/document/mapper/DocumentMapperUtil.java

@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+
 import io.crnk.core.boot.CrnkProperties;
 import io.crnk.core.engine.document.Resource;
 import io.crnk.core.engine.document.ResourceIdentifier;
@@ -63,7 +64,12 @@ public DocumentMapperUtil(ResourceRegistry resourceRegistry, ObjectMapper object
 	protected static List<ResourceField> getRequestedFields(ResourceInformation resourceInformation, QueryAdapter queryAdapter,
 			List<ResourceField> fields, boolean relation) {
 		Map<String, Set<PathSpec>> includedFieldsSet = queryAdapter != null ? queryAdapter.getIncludedFields() : null;
-		Set<PathSpec> includedFields = includedFieldsSet != null ? includedFieldsSet.get(resourceInformation.getResourceType()) : null;
+		final Set<PathSpec> includedFields = new HashSet<>();
+
+		if (includedFieldsSet != null) {
+			addIfNotNull(includedFields, includedFieldsSet.get(resourceInformation.getResourceType()));
+			addIfNotNull(includedFields, includedFieldsSet.get(resourceInformation.getSuperResourceType()));
+		}
 		if (noResourceIncludedFieldsSpecified(includedFields)) {
 			return fields;
 		}
@@ -72,6 +78,12 @@ protected static List<ResourceField> getRequestedFields(ResourceInformation reso
 		}
 	}
 
+	private static <T> void addIfNotNull(Set<T> set, Collection<T> collection) {
+		if (collection != null) {
+			set.addAll(collection);
+		}
+	}
+
 	private static List<ResourceField> computeRequestedFields(Set<PathSpec> includedFields, boolean relation,
 			QueryAdapter queryAdapter, ResourceInformation resourceInformation, List<ResourceField> fields) {
 

crnk-core/src/test/java/io/crnk/core/CoreTestModule.java

@@ -14,6 +14,7 @@
 import io.crnk.core.mock.repository.RelationIdTestRepository;
 import io.crnk.core.mock.repository.RelationshipBehaviorTestRepository;
 import io.crnk.core.mock.repository.ScheduleRepositoryImpl;
+import io.crnk.core.mock.repository.SuperTaskRepository;
 import io.crnk.core.mock.repository.TaskRepository;
 import io.crnk.core.mock.repository.TaskToProjectRepository;
 import io.crnk.core.mock.repository.TaskWithLookupRepository;
@@ -38,6 +39,7 @@ public void setupModule(ModuleContext context) {
         context.addRepository(new ProjectToTaskRepository());
         context.addRepository(new ProjectPolymorphicRepository());
         context.addRepository(new ScheduleRepositoryImpl());
+	    context.addRepository(new SuperTaskRepository());
         context.addRepository(new ThingRepository());
         context.addRepository(new TaskRepository());
         context.addRepository(new TaskToProjectRepository());

crnk-core/src/test/java/io/crnk/core/engine/internal/document/mapper/DocumentMapperTest.java

@@ -1,6 +1,5 @@
 package io.crnk.core.engine.internal.document.mapper;
 
-import java.net.URI;
 import java.time.OffsetDateTime;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -17,7 +16,6 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectWriter;
 import com.fasterxml.jackson.databind.node.ObjectNode;
-import com.fasterxml.jackson.databind.node.TextNode;
 import io.crnk.core.engine.document.Document;
 import io.crnk.core.engine.document.ErrorData;
 import io.crnk.core.engine.document.Relationship;
@@ -27,6 +25,8 @@
 import io.crnk.core.mock.models.LazyTask;
 import io.crnk.core.mock.models.Project;
 import io.crnk.core.mock.models.Schedule;
+import io.crnk.core.mock.models.SpecialTask;
+import io.crnk.core.mock.models.SuperTask;
 import io.crnk.core.mock.models.Task;
 import io.crnk.core.queryspec.PathSpec;
 import io.crnk.core.queryspec.QuerySpec;
@@ -648,6 +648,29 @@ public void testAttributesSelection() {
 		Assert.assertEquals("sample category", resource.getAttributes().get("category").asText());
 	}
 
+	@Test
+	public void testSupertypeAttributesSelection() {
+		SpecialTask task = createSpecialTask(2, "sample task");
+		task.setEnd("next month");
+		JsonApiResponse response = new JsonApiResponse();
+		response.setEntity(task);
+
+		QuerySpec querySpec = new QuerySpec(SpecialTask.class);
+		querySpec.includeField(PathSpec.of("end"));
+		final QuerySpec superQuerySpec = new QuerySpec(SuperTask.class);
+		superQuerySpec.includeField(PathSpec.of("name"));
+		querySpec.setNestedSpecs(Collections.singletonList(superQuerySpec));
+
+		Document document = mapper.toDocument(response, toAdapter(querySpec), mappingConfig).get();
+		Resource resource = document.getSingleData().get();
+		Assert.assertEquals("2", resource.getId());
+		Assert.assertEquals("specialTask", resource.getType());
+		Assert.assertNull(resource.getAttributes().get("category"));
+		Assert.assertNull(resource.getAttributes().get("recurring"));
+		Assert.assertEquals("sample task", resource.getAttributes().get("name").asText());
+		Assert.assertEquals("next month", resource.getAttributes().get("end").asText());
+	}
+
 	@Test
 	public void testAttributesOrdering() {
 		Task task = createTask(3, "sample task");
@@ -690,6 +713,13 @@ private LazyTask createLazyTask(long id) {
 		return task;
 	}
 
+	private SpecialTask createSpecialTask(long id, String name) {
+		SpecialTask task = new SpecialTask();
+		task.setId(id);
+		task.setName(name);
+		return task;
+	}
+
 	public static class TestLinksInformation implements LinksInformation {
 
 		public Link value;

crnk-core/src/test/java/io/crnk/core/mock/models/SpecialTask.java

@@ -0,0 +1,27 @@
+package io.crnk.core.mock.models;
+
+import io.crnk.core.resource.annotations.JsonApiResource;
+
+@JsonApiResource(type = "specialTask", resourcePath = "superTasks")
+public class SpecialTask extends SuperTask {
+
+	private boolean recurring;
+
+	private String end;
+
+	public boolean isRecurring() {
+		return recurring;
+	}
+
+	public void setRecurring(final boolean recurring) {
+		this.recurring = recurring;
+	}
+
+	public String getEnd() {
+		return end;
+	}
+
+	public void setEnd(final String end) {
+		this.end = end;
+	}
+}

crnk-core/src/test/java/io/crnk/core/mock/models/SuperTask.java

@@ -0,0 +1,40 @@
+package io.crnk.core.mock.models;
+
+import io.crnk.core.resource.annotations.JsonApiId;
+import io.crnk.core.resource.annotations.JsonApiResource;
+
+@JsonApiResource(type = "superTasks", subTypes = SpecialTask.class)
+public abstract class SuperTask {
+
+	@JsonApiId
+	private Long id;
+
+	private String name;
+
+	private String category;
+
+	public Long getId() {
+		return id;
+	}
+
+	public SuperTask setId(Long id) {
+		this.id = id;
+		return this;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(@SuppressWarnings("SameParameterValue") String name) {
+		this.name = name;
+	}
+
+	public String getCategory() {
+		return category;
+	}
+
+	public void setCategory(final String category) {
+		this.category = category;
+	}
+}

crnk-core/src/test/java/io/crnk/core/mock/repository/SuperTaskRepository.java

@@ -0,0 +1,26 @@
+package io.crnk.core.mock.repository;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import io.crnk.core.mock.models.SpecialTask;
+import io.crnk.core.mock.models.SuperTask;
+import io.crnk.core.queryspec.QuerySpec;
+import io.crnk.core.repository.ReadOnlyResourceRepositoryBase;
+import io.crnk.core.resource.list.ResourceList;
+
+public class SuperTaskRepository extends ReadOnlyResourceRepositoryBase<SuperTask, Long> {
+
+	private Set<SpecialTask> tasks = new HashSet<>();
+
+	private long nextId = 0;
+
+	public SuperTaskRepository() {
+		super(SuperTask.class);
+	}
+
+	@Override
+	public ResourceList<SuperTask> findAll(final QuerySpec querySpec) {
+		return null;
+	}
+}