Tweak to elements parametr support

hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/JsonParser.java

@@ -1277,18 +1277,22 @@ public class JsonParser extends BaseParser implements IJsonLikeParser {
 	private void writeExtensionsAsDirectChild(IBaseResource theResource, JsonLikeWriter theEventWriter, RuntimeResourceDefinition resDef, List<HeldExtension> extensions,
 															List<HeldExtension> modifierExtensions, EncodeContext theEncodeContext) throws IOException {
 		if (extensions.isEmpty() == false) {
+			theEncodeContext.pushPath("extension", false);
 			beginArray(theEventWriter, "extension");
 			for (HeldExtension next : extensions) {
 				next.write(resDef, theResource, theEventWriter, theEncodeContext);
 			}
 			theEventWriter.endArray();
+			theEncodeContext.popPath();
 		}
 		if (modifierExtensions.isEmpty() == false) {
+			theEncodeContext.pushPath("modifierExtension", false);
 			beginArray(theEventWriter, "modifierExtension");
 			for (HeldExtension next : modifierExtensions) {
 				next.write(resDef, theResource, theEventWriter, theEncodeContext);
 			}
 			theEventWriter.endArray();
+			theEncodeContext.popPath();
 		}
 	}
 

hapi-fhir-jpaserver-base/src/test/java/ca/uhn/fhir/jpa/config/TestR4Config.java

@@ -3,6 +3,7 @@ package ca.uhn.fhir.jpa.config;
 import ca.uhn.fhir.rest.server.interceptor.RequestValidatingInterceptor;
 import ca.uhn.fhir.validation.ResultSeverityEnum;
 import net.ttddyy.dsproxy.listener.SingleQueryCountHolder;
+import net.ttddyy.dsproxy.listener.logging.SLF4JLogLevel;
 import net.ttddyy.dsproxy.support.ProxyDataSourceBuilder;
 import org.apache.commons.dbcp2.BasicDataSource;
 import org.springframework.context.annotation.Bean;

hapi-fhir-jpaserver-base/src/test/java/ca/uhn/fhir/jpa/dao/r4/FhirResourceDaoR4SearchNoFtTest.java

@@ -2029,6 +2029,24 @@ public class FhirResourceDaoR4SearchNoFtTest extends BaseJpaR4Test {
 
 	}
 
+	@Test
+	public void testSearchStringParamWithLike() throws Exception {
+		SearchParameterMap map = new SearchParameterMap();
+		map.add(Patient.SP_FAMILY, new StringOrListParam().addOr(new StringParam("AAA")).addOr(new StringParam("BBB")));
+		map.setLoadSynchronous(true);
+		myPatientDao.search(map);
+
+		List<String> queries = CaptureQueriesListener
+			.getLastNQueries()
+			.stream()
+			.map(t -> t.getSql(true, true))
+			.filter(t -> t.contains("select"))
+			.collect(Collectors.toList());
+
+		ourLog.info("Queries:\n  " + queries.stream().collect(Collectors.joining("\n  ")));
+	}
+
+
 	@Test
 	public void testSearchStringParam() throws Exception {
 		IIdType pid1;

hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/rest/server/ElementsParamR4Test.java

@@ -246,6 +246,42 @@ public class ElementsParamR4Test {
 			});
 	}
 
+	@Test
+	public void testMultiResourceElementsOnExtension() throws IOException {
+		ourNextProcedure = new Procedure();
+		ourNextProcedure.setId("Procedure/PROC");
+		ourNextProcedure.addExtension()
+			.setUrl("http://quantity")
+			.setValue(Quantity.fromUcum("1.1", "mg"));
+		verifyXmlAndJson(
+			"http://localhost:" + ourPort + "/Procedure?_elements=Procedure.extension",
+			bundle -> {
+				Procedure procedure = (Procedure) bundle.getEntry().get(0).getResource();
+				assertEquals("SUBSETTED", procedure.getMeta().getTag().get(0).getCode());
+				assertEquals(0, procedure.getReasonCode().size());
+				assertEquals("http://quantity", procedure.getExtension().get(0).getUrl());
+				assertEquals("mg", ((Quantity) procedure.getExtension().get(0).getValue()).getCode());
+			});
+
+		verifyXmlAndJson(
+			"http://localhost:" + ourPort + "/Procedure?_elements=Procedure.extension.value.value",
+			bundle -> {
+				Procedure procedure = (Procedure) bundle.getEntry().get(0).getResource();
+				assertEquals("SUBSETTED", procedure.getMeta().getTag().get(0).getCode());
+				assertEquals(0, procedure.getReasonCode().size());
+				assertEquals("1.1", ((Quantity) procedure.getExtension().get(0).getValue()).getValueElement().getValueAsString());
+				assertEquals(null, ((Quantity) procedure.getExtension().get(0).getValue()).getCode());
+			});
+
+		verifyXmlAndJson(
+			"http://localhost:" + ourPort + "/Procedure?_elements=Procedure.reason",
+			bundle -> {
+				Procedure procedure = (Procedure) bundle.getEntry().get(0).getResource();
+				assertEquals("SUBSETTED", procedure.getMeta().getTag().get(0).getCode());
+				assertEquals(0, procedure.getExtension().size());
+			});
+	}
+
 	@Test
 	public void testMultiResourceElementsFilterWithMetadataExcluded() throws IOException {
 		createProcedureWithLongChain();

src/changes/changes.xml

@@ -26,6 +26,11 @@
 				enabled after the refactoring of how Subscriptions are enabled that
 				occurred in HAPI FHIR 3.7.0. Thanks to Volker Schmidt for the pull request!
 			</action>
+			<action type="fix">
+				When using the <![CDATA[<code>_elements</code>]]> parameter on searches and reads,
+				requesting extensions to be included caused the extensions to be included but 
+				not any values contained within. This has been corrected.
+			</action>
 		</release>
 		<release version="3.7.0" date="2019-02-06" description="Gale">
 			<action type="add">