src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorEntity.java

@@ -20,6 +20,7 @@ import org.hibernate.annotations.NotFound;
 import org.hibernate.annotations.NotFoundAction;
 
 import jakarta.persistence.*;
+import jakarta.persistence.Version;
 import jakarta.validation.constraints.Pattern;
 import java.io.IOException;
 import java.util.UUID;

src/main/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerController.java

@@ -26,6 +26,8 @@ import jakarta.persistence.PersistenceContext;
 import java.util.List;
 import java.util.UUID;
 
+import static net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationType.EX_PARTNER;
+
 @RestController
 
 public class HsOfficePartnerController implements HsOfficePartnersApi {
@@ -128,14 +130,23 @@ public class HsOfficePartnerController implements HsOfficePartnersApi {
         context.define(currentUser, assumedRoles);
 
         final var current = partnerRepo.findByUuid(partnerUuid).orElseThrow();
+        final var previousPartnerRel = current.getPartnerRel();
 
         new HsOfficePartnerEntityPatcher(em, current).apply(body);
 
         final var saved = partnerRepo.save(current);
+        optionallyCreateExPartnerRelation(saved, previousPartnerRel);
+
         final var mapped = mapper.map(saved, HsOfficePartnerResource.class);
         return ResponseEntity.ok(mapped);
     }
 
+    private void optionallyCreateExPartnerRelation(final HsOfficePartnerEntity saved, final HsOfficeRelationEntity previousPartnerRel) {
+        if (!saved.getPartnerRel().getUuid().equals(previousPartnerRel.getUuid())) {
+            relationRepo.save(previousPartnerRel.toBuilder().uuid(null).type(EX_PARTNER).build());
+        }
+    }
+
     private HsOfficePartnerEntity createPartnerEntity(final HsOfficePartnerInsertResource body) {
         final var entityToSave = new HsOfficePartnerEntity();
         entityToSave.setPartnerNumber(body.getPartnerNumber());

src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationEntity.java

@@ -30,7 +30,7 @@ import static net.hostsharing.hsadminng.stringify.Stringify.stringify;
 @Table(name = "hs_office_relation_rv")
 @Getter
 @Setter
-@Builder
+@Builder(toBuilder = true)
 @NoArgsConstructor
 @AllArgsConstructor
 @FieldNameConstants

src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java

@@ -21,6 +21,7 @@ import org.springframework.transaction.annotation.Transactional;
 
 import java.util.UUID;
 
+import static net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationType.EX_PARTNER;
 import static net.hostsharing.test.IsValidUuidMatcher.isUuidValid;
 import static net.hostsharing.test.JsonMatcher.lenientlyEquals;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -41,7 +42,7 @@ class HsOfficePartnerControllerAcceptanceTest extends ContextBasedTestWithCleanu
     HsOfficePartnerRepository partnerRepo;
 
     @Autowired
-    HsOfficeRelationRepository relationRepository;
+    HsOfficeRelationRepository relationRepo;
 
     @Autowired
     HsOfficePersonRepository personRepo;
@@ -376,6 +377,45 @@ class HsOfficePartnerControllerAcceptanceTest extends ContextBasedTestWithCleanu
                     });
         }
 
+        @Test
+        void patchingThePartnerRelCreatesExPartnerRel() {
+
+            context.define("superuser-alex@hostsharing.net");
+            final var givenPartner = givenSomeTemporaryPartnerBessler(20011);
+            final var givenPartnerRel = givenSomeTemporaryPartnerRel("Third OHG", "third contact");
+
+            RestAssured // @formatter:off
+                    .given()
+                        .header("current-user", "superuser-alex@hostsharing.net")
+                        .contentType(ContentType.JSON)
+                        .body("""
+                                {
+                                   "partnerRelUuid": "%s"
+                                }
+                                """.formatted(givenPartnerRel.getUuid()))
+                        .port(port)
+                    .when()
+                        .patch("http://localhost/api/hs/office/partners/" + givenPartner.getUuid())
+                    .then().log().body()
+                        .assertThat().statusCode(200);
+            // @formatter:on
+
+            // then the partner got actually updated
+            context.define("superuser-alex@hostsharing.net");
+            assertThat(partnerRepo.findByUuid(givenPartner.getUuid())).isPresent().get()
+                    .matches(partner -> {
+                        assertThat(partner.getPartnerRel().getHolder().getTradeName()).isEqualTo("Third OHG");
+                        assertThat(partner.getPartnerRel().getContact().getLabel()).isEqualTo("third contact");
+                        return true;
+                    });
+
+            // and an ex-partner-relation got created
+            final var anchorpartnerPersonUUid = givenPartner.getPartnerRel().getAnchor().getUuid();
+            assertThat(relationRepo.findRelationRelatedToPersonUuidAndRelationType(anchorpartnerPersonUUid, EX_PARTNER))
+                    .map(HsOfficeRelationEntity::toShortString)
+                    .contains("rel(anchor='LP Hostsharing eG', type='EX_PARTNER', holder='UF Erben Bessler')");
+        }
+
         @Test
         void globalAdmin_withoutAssumedRole_canPatchPartialPropertiesOfArbitraryPartner() {
 
@@ -402,23 +442,19 @@ class HsOfficePartnerControllerAcceptanceTest extends ContextBasedTestWithCleanu
                     .statusCode(200)
                     .contentType(ContentType.JSON)
                     .body("uuid", isUuidValid())
-                    .body("details.birthName", is("Maja Schmidt"));
+                    .body("details.birthName", is("Maja Schmidt"))
-            // TODO: assert partnerRel
+                    .body("partnerRel.contact.label", is(givenPartner.getPartnerRel().getContact().getLabel()));
-//                    .body("contact.label", is(givenPartner.getContact().getLabel()))
-//                    .body("person.tradeName", is(givenPartner.getPerson().getTradeName()));
             // @formatter:on
 
-            // finally, the partner is actually updated
+            // finally, the partner details and only the partner details are actually updated
             assertThat(partnerRepo.findByUuid(givenPartner.getUuid())).isPresent().get()
-                    .matches(person -> {
+                    .matches(partner -> {
-                        // TODO: assert partnerRel
+                        assertThat(partner.getPartnerRel().getContact().getLabel()).isEqualTo(givenPartner.getPartnerRel().getContact().getLabel());
-//                        assertThat(person.getPerson().getTradeName()).isEqualTo(givenPartner.getPerson().getTradeName());
+                        assertThat(partner.getDetails().getRegistrationOffice()).isEqualTo("Temp Registergericht Leer");
-//                        assertThat(person.getContact().getLabel()).isEqualTo(givenPartner.getContact().getLabel());
+                        assertThat(partner.getDetails().getRegistrationNumber()).isEqualTo("333333");
-                        assertThat(person.getDetails().getRegistrationOffice()).isEqualTo("Temp Registergericht Leer");
+                        assertThat(partner.getDetails().getBirthName()).isEqualTo("Maja Schmidt");
-                        assertThat(person.getDetails().getRegistrationNumber()).isEqualTo("333333");
+                        assertThat(partner.getDetails().getBirthday()).isEqualTo("1938-04-08");
-                        assertThat(person.getDetails().getBirthName()).isEqualTo("Maja Schmidt");
+                        assertThat(partner.getDetails().getDateOfDeath()).isEqualTo("2022-01-12");
-                        assertThat(person.getDetails().getBirthday()).isEqualTo("1938-04-08");
-                        assertThat(person.getDetails().getDateOfDeath()).isEqualTo("2022-01-12");
                         return true;
                     });
         }
@@ -446,7 +482,7 @@ class HsOfficePartnerControllerAcceptanceTest extends ContextBasedTestWithCleanu
 
             // then the given partner is gone
             assertThat(partnerRepo.findByUuid(givenPartner.getUuid())).isEmpty();
-            assertThat(relationRepository.findByUuid(givenPartner.getPartnerRel().getUuid())).isEmpty();
+            assertThat(relationRepo.findByUuid(givenPartner.getPartnerRel().getUuid())).isEmpty();
         }
 
         @Test