Make Pet.visits @Transient

In that way the Pet and Visit entities are more modular, and we
don't have to rely on a bit of a hack which is that Hibernate
happily maps Pet to its ID in the entity generation (but fails
if you do it at compile time).

src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.samples.petclinic.owner;
 
+import org.springframework.samples.petclinic.visit.VisitRepository;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.validation.BindingResult;
@@ -40,10 +41,12 @@ class OwnerController {
 
     private static final String VIEWS_OWNER_CREATE_OR_UPDATE_FORM = "owners/createOrUpdateOwnerForm";
     private final OwnerRepository owners;
+    private VisitRepository visits;
 
 
-    public OwnerController(OwnerRepository clinicService) {
+    public OwnerController(OwnerRepository clinicService, VisitRepository visits) {
         this.owners = clinicService;
+        this.visits = visits;
     }
 
     @InitBinder
@@ -126,7 +129,11 @@ class OwnerController {
     @GetMapping("/owners/{ownerId}")
     public ModelAndView showOwner(@PathVariable("ownerId") int ownerId) {
         ModelAndView mav = new ModelAndView("owners/ownerDetails");
-        mav.addObject(this.owners.findById(ownerId));
+        Owner owner = this.owners.findById(ownerId);
+        for (Pet pet : owner.getPets()) {
+            pet.setVisitsInternal(visits.findByPetId(pet.getId()));
+        }
+        mav.addObject(owner);
         return mav;
     }
 

src/main/java/org/springframework/samples/petclinic/owner/Pet.java

@@ -17,20 +17,19 @@ package org.springframework.samples.petclinic.owner;
 
 import java.time.LocalDate;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
-import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
-import javax.persistence.FetchType;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
-import javax.persistence.OneToMany;
 import javax.persistence.Table;
+import javax.persistence.Transient;
 
 import org.springframework.beans.support.MutableSortDefinition;
 import org.springframework.beans.support.PropertyComparator;
@@ -61,7 +60,7 @@ public class Pet extends NamedEntity {
     @JoinColumn(name = "owner_id")
     private Owner owner;
 
-    @OneToMany(cascade = CascadeType.ALL, mappedBy = "petId", fetch = FetchType.EAGER)
+    @Transient
     private Set<Visit> visits = new LinkedHashSet<>();
 
     public void setBirthDate(LocalDate birthDate) {
@@ -95,8 +94,8 @@ public class Pet extends NamedEntity {
         return this.visits;
     }
 
-    protected void setVisitsInternal(Set<Visit> visits) {
-        this.visits = visits;
+    protected void setVisitsInternal(Collection<Visit> visits) {
+        this.visits = new LinkedHashSet<>(visits);
     }
 
     public List<Visit> getVisits() {

src/main/java/org/springframework/samples/petclinic/owner/VisitController.java

@@ -15,15 +15,20 @@
  */
 package org.springframework.samples.petclinic.owner;
 
+import java.util.Map;
+
+import javax.validation.Valid;
+
 import org.springframework.samples.petclinic.visit.Visit;
 import org.springframework.samples.petclinic.visit.VisitRepository;
 import org.springframework.stereotype.Controller;
 import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.WebDataBinder;
-import org.springframework.web.bind.annotation.*;
-
-import javax.validation.Valid;
-import java.util.Map;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
 
 /**
  * @author Juergen Hoeller
@@ -62,6 +67,7 @@ class VisitController {
     @ModelAttribute("visit")
     public Visit loadPetWithVisit(@PathVariable("petId") int petId, Map<String, Object> model) {
         Pet pet = this.pets.findById(petId);
+        pet.setVisitsInternal(this.visits.findByPetId(petId));
         model.put("pet", pet);
         Visit visit = new Visit();
         pet.addVisit(visit);

src/test/java/org/springframework/samples/petclinic/owner/OwnerControllerTests.java

@@ -16,8 +16,29 @@
 
 package org.springframework.samples.petclinic.owner;
 
+import java.time.LocalDate;
+import java.util.Collections;
+import java.util.List;
+
+import org.assertj.core.util.Lists;
+import org.hamcrest.BaseMatcher;
+import org.hamcrest.Description;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.samples.petclinic.visit.Visit;
+import org.springframework.samples.petclinic.visit.VisitRepository;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.hamcrest.Matchers.empty;
 import static org.hamcrest.Matchers.hasProperty;
 import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
 import static org.mockito.BDDMockito.given;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
@@ -25,19 +46,6 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
 
-import org.assertj.core.util.Lists;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
-import org.springframework.boot.test.mock.mockito.MockBean;
-import org.springframework.samples.petclinic.owner.Owner;
-import org.springframework.samples.petclinic.owner.OwnerController;
-import org.springframework.samples.petclinic.owner.OwnerRepository;
-import org.springframework.test.context.junit4.SpringRunner;
-import org.springframework.test.web.servlet.MockMvc;
-
 /**
  * Test class for {@link OwnerController}
  *
@@ -55,6 +63,9 @@ public class OwnerControllerTests {
     @MockBean
     private OwnerRepository owners;
 
+    @MockBean
+    private VisitRepository visits;
+
     private Owner george;
 
     @Before
@@ -66,7 +77,18 @@ public class OwnerControllerTests {
         george.setAddress("110 W. Liberty St.");
         george.setCity("Madison");
         george.setTelephone("6085551023");
+        Pet max = new Pet();
+        PetType dog = new PetType();
+        dog.setName("dog");
+        max.setId(1);
+        max.setType(dog);
+        max.setName("Max");
+        max.setBirthDate(LocalDate.now());
+        george.setPetsInternal(Collections.singleton(max));
         given(this.owners.findById(TEST_OWNER_ID)).willReturn(george);
+        Visit visit = new Visit();
+        visit.setDate(LocalDate.now());
+        given(this.visits.findByPetId(max.getId())).willReturn(Collections.singletonList(visit));
     }
 
     @Test
@@ -189,6 +211,24 @@ public class OwnerControllerTests {
             .andExpect(model().attribute("owner", hasProperty("address", is("110 W. Liberty St."))))
             .andExpect(model().attribute("owner", hasProperty("city", is("Madison"))))
             .andExpect(model().attribute("owner", hasProperty("telephone", is("6085551023"))))
+            .andExpect(model().attribute("owner", hasProperty("pets", not(empty()))))
+            .andExpect(model().attribute("owner", hasProperty("pets", new BaseMatcher<List<Pet>>() {
+
+                @Override
+                public boolean matches(Object item) {
+                    @SuppressWarnings("unchecked")
+                    List<Pet> pets = (List<Pet>) item;
+                    Pet pet = pets.get(0);
+                    if (pet.getVisits().isEmpty()) {
+                        return false;
+                    }
+                    return true;
+                }
+
+                @Override
+                public void describeTo(Description description) {
+                    description.appendText("Max did not have any visits");
+                }})))
             .andExpect(view().name("owners/ownerDetails"));
     }