[kiworkshop#31] Refactor domain

- Refactor Article, Tag domain
- Add article.http

content-api/src/main/java/community/content/simplelife/article.http

@@ -0,0 +1,21 @@
+# For a quick start check out our HTTP Requests collection (Tools|HTTP Client|Open HTTP Requests Collection) or
+# paste cURL into the file and request will be converted to HTTP Request format.
+#
+# Following HTTP Request Live Templates are available:
+# * 'gtrp' and 'gtr' create a GET request with or without query parameters;
+# * 'ptr' and 'ptrp' create a POST request with a simple or parameter-like body;
+# * 'mptr' and 'fptr' create a POST request to submit a form with a text or file field (multipart/form-data);import community.content.simplelife.article.domain.SimpleArticle;
+POST localhost:8080/simplelife/articles
+Content-Type: application/json
+
+{
+  "title": "title1",
+  "description": "description1",
+  "content": "content1",
+  "simpleTags": ["tag1","tag2"]
+}
+
+###
+DELETE localhost:8080/simplelife/articles/1
+
+###

content-api/src/main/java/community/content/simplelife/article/domain/SimpleArticle.java

@@ -35,7 +35,7 @@ public class SimpleArticle {
   private ZonedDateTime updatedAt;
   @ManyToMany(fetch = FetchType.LAZY,
           cascade = {CascadeType.PERSIST, CascadeType.MERGE})
-  @JoinTable(name = "post_tags",
+  @JoinTable(name = "post_tag",
           joinColumns = { @JoinColumn(name = "post_id") },
           inverseJoinColumns = { @JoinColumn(name = "tag_id") })
   private Set<SimpleTag> simpleTags = new HashSet<>();
@@ -62,10 +62,16 @@ public void addTags(Set<SimpleTag> simpleTags) {
     this.simpleTags.addAll(simpleTags);
   }
 
-  public void update(String title, String description, String content, Set<SimpleTag> simpleTags) {
-    this.title = title;
-    this.description = description;
-    this.content = content;
-    this.simpleTags.addAll(simpleTags);
+  public void updateTag(Set<SimpleTag> simpleTags) {
+    this.simpleTags = simpleTags;
+  }
+
+  public void update(SimpleArticle simpleArticle, Set<SimpleTag> simpleTags) {
+    this.simpleTags.forEach(simpleTag -> simpleTag.deletePost(this));
+
+    this.title = simpleArticle.title;
+    this.description = simpleArticle.description;
+    this.content = simpleArticle.content;
+    this.simpleTags = simpleTags;
   }
 }

content-api/src/main/java/community/content/simplelife/article/domain/SimpleTag.java

@@ -27,8 +27,7 @@ public class SimpleTag {
   private Set<SimpleArticle> simpleArticles = new HashSet<>();
 
   @Builder
-  private SimpleTag(String name
-  ) {
+  private SimpleTag(String name) {
     Assert.hasLength(name, "tagName should not be empty.");
 
     this.name = name;
@@ -37,4 +36,8 @@ private SimpleTag(String name
   public void addArticle(SimpleArticle simpleArticle) {
     this.simpleArticles.add(simpleArticle);
   }
+
+  public void deletePost(SimpleArticle simpleArticle) {
+    this.simpleArticles.remove(simpleArticle);
+  }
 }

content-api/src/main/java/community/content/simplelife/article/domain/SimpleTagRepository.java

@@ -1,6 +1,8 @@
 package community.content.simplelife.article.domain;
 
+import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface SimpleTagRepository extends JpaRepository<SimpleTag, Long> {
+  Optional<SimpleTag> findByName(String name);
 }

content-api/src/test/java/community/content/simplelife/article/domain/SimpleArticleTest.java

@@ -59,16 +59,21 @@ void update_ValidInput_ValidOutput() {
         .content("content")
         .simpleTags(simpleTags).build();
 
+    SimpleArticle articleToUpdate = SimpleArticle.builder()
+        .title("updated title")
+        .description("updated description")
+        .content("updated content").build();
+
     // when
-    simpleArticle.update("updated title", "updated description", "updated content", newSimpleTags);
+    simpleArticle.update(articleToUpdate, newSimpleTags);
 
     // then
     simpleTags.addAll(newSimpleTags);
     then(simpleArticle).hasNoNullFieldsOrPropertiesExcept("id","createdAt", "updatedAt");
     then(simpleArticle.getTitle()).isEqualTo("updated title");
     then(simpleArticle.getDescription()).isEqualTo("updated description");
     then(simpleArticle.getContent()).isEqualTo("updated content");
-    then(simpleArticle.getSimpleTags()).isEqualTo(simpleTags);
+    then(simpleArticle.getSimpleTags()).isEqualTo(newSimpleTags);
   }
 
   @Test