#3158 BeanMapping#ignoreByDefault should work properly for constructor properties

processor/src/main/java/org/mapstruct/ap/internal/model/BeanMappingMethod.java

@@ -285,7 +285,11 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
                 return null;
             }
 
-            if ( !mappingReferences.isRestrictToDefinedMappings() ) {
+            boolean applyImplicitMappings = !mappingReferences.isRestrictToDefinedMappings();
+            if ( applyImplicitMappings ) {
+                applyImplicitMappings = beanMapping == null || !beanMapping.isignoreByDefault();
+            }
+            if ( applyImplicitMappings ) {
 
                 // apply name based mapping from a source reference
                 applyTargetThisMapping();
@@ -1522,6 +1526,10 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
             if ( mappingReferences.isForForgedMethods() ) {
                 return ReportingPolicyGem.IGNORE;
             }
+            // If we have ignoreByDefault = true, unprocessed target properties are not an issue.
+            if ( method.getOptions().getBeanMapping().isignoreByDefault() ) {
+                return ReportingPolicyGem.IGNORE;
+            }
             if ( method.getOptions().getBeanMapping() != null ) {
                 return method.getOptions().getBeanMapping().unmappedTargetPolicy();
             }

processor/src/test/java/org/mapstruct/ap/test/bugs/_2149/Issue2149Test.java

@@ -30,12 +30,6 @@ public class Issue2149Test {
                 line = 18,
                 message = "Using @BeanMapping( ignoreByDefault = true ) with @Mapping( target = \".\", ... ) is not " +
                     "allowed. You'll need to explicitly ignore the target properties that should be ignored instead."
-            ),
-            @Diagnostic(
-                type = Erroneous2149Mapper.class,
-                kind = javax.tools.Diagnostic.Kind.WARNING,
-                line = 20,
-                message = "Unmapped target property: \"address\"."
             )
         }
     )

processor/src/test/java/org/mapstruct/ap/test/bugs/_3158/Issue3158Mapper.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3158;
+
+import org.mapstruct.BeanMapping;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper
+public interface Issue3158Mapper {
+
+    Issue3158Mapper INSTANCE = Mappers.getMapper( Issue3158Mapper.class );
+
+    @BeanMapping(ignoreByDefault = true)
+    @Mapping(target = "name")
+    Target map(Target target);
+
+    class Target {
+        private final String name;
+        private final String email;
+
+        public Target(String name, String email) {
+            this.name = name;
+            this.email = email;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public String getEmail() {
+            return email;
+        }
+    }
+
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3158/Issue3158Test.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._3158;
+
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.ProcessorTest;
+import org.mapstruct.ap.testutil.WithClasses;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Filip Hrisafov
+ */
+@WithClasses(Issue3158Mapper.class)
+@IssueKey("3158")
+class Issue3158Test {
+
+    @ProcessorTest
+    void beanMappingIgnoreByDefaultShouldBeRespectedForConstructorProperties() {
+        Issue3158Mapper.Target target = Issue3158Mapper.INSTANCE.map( new Issue3158Mapper.Target(
+            "tester",
+            "tester@test.com"
+        ) );
+
+        assertThat( target.getName() ).isEqualTo( "tester" );
+        assertThat( target.getEmail() ).isNull();
+    }
+}