should favorite article

src/main/java/io/spring/api/ArticleFavoriteApi.java

@@ -0,0 +1,56 @@
+package io.spring.api;
+
+import io.spring.api.exception.ResourceNotFoundException;
+import io.spring.application.article.ArticleData;
+import io.spring.application.article.ArticleQueryService;
+import io.spring.core.article.Article;
+import io.spring.core.article.ArticleRepository;
+import io.spring.core.favorite.ArticleFavorite;
+import io.spring.core.favorite.ArticleFavoriteRepository;
+import io.spring.core.user.User;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.HashMap;
+
+@RestController
+@RequestMapping(path = "articles/{slug}/favorite")
+public class ArticleFavoriteApi {
+    private ArticleFavoriteRepository articleFavoriteRepository;
+    private ArticleRepository articleRepository;
+    private ArticleQueryService articleQueryService;
+
+    @Autowired
+    public ArticleFavoriteApi(ArticleFavoriteRepository articleFavoriteRepository,
+                              ArticleRepository articleRepository,
+                              ArticleQueryService articleQueryService) {
+        this.articleFavoriteRepository = articleFavoriteRepository;
+        this.articleRepository = articleRepository;
+        this.articleQueryService = articleQueryService;
+    }
+
+    @PostMapping
+    public ResponseEntity favoriteArticle(@PathVariable("slug") String slug,
+                                          @AuthenticationPrincipal User user) {
+        Article article = getArticle(slug);
+        ArticleFavorite articleFavorite = new ArticleFavorite(article.getId(), user.getId());
+        articleFavoriteRepository.save(articleFavorite);
+        return responseArticleData(articleQueryService.findBySlug(slug, user).get());
+    }
+
+    private ResponseEntity<HashMap<String, Object>> responseArticleData(final ArticleData articleData) {
+        return ResponseEntity.status(201).body(new HashMap<String, Object>() {{
+            put("article", articleData);
+        }});
+    }
+
+    private Article getArticle(String slug) {
+        return articleRepository.findBySlug(slug).map(article -> article)
+            .orElseThrow(ResourceNotFoundException::new);
+    }
+}

src/main/java/io/spring/core/favorite/ArticleFavorite.java

@@ -0,0 +1,18 @@
+package io.spring.core.favorite;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+public class ArticleFavorite {
+    private String articleId;
+    private String userId;
+
+    public ArticleFavorite(String articleId, String userId) {
+        this.articleId = articleId;
+        this.userId = userId;
+    }
+}

src/main/java/io/spring/core/favorite/ArticleFavoriteRepository.java

@@ -0,0 +1,5 @@
+package io.spring.core.favorite;
+
+public interface ArticleFavoriteRepository {
+    void save(ArticleFavorite articleFavorite);
+}

src/main/java/io/spring/infrastructure/favorite/ArticleFavoriteMapper.java

@@ -0,0 +1,14 @@
+package io.spring.infrastructure.favorite;
+
+import io.spring.core.favorite.ArticleFavorite;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.springframework.stereotype.Component;
+
+@Mapper
+@Component
+public interface ArticleFavoriteMapper {
+    boolean find(@Param("articleFavorite") ArticleFavorite articleFavorite);
+
+    void insert(@Param("articleFavorite") ArticleFavorite articleFavorite);
+}

src/main/java/io/spring/infrastructure/favorite/MyBatisArticleFavoriteRepository.java

@@ -0,0 +1,23 @@
+package io.spring.infrastructure.favorite;
+
+import io.spring.core.favorite.ArticleFavorite;
+import io.spring.core.favorite.ArticleFavoriteRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class MyBatisArticleFavoriteRepository implements ArticleFavoriteRepository {
+    private ArticleFavoriteMapper mapper;
+
+    @Autowired
+    public MyBatisArticleFavoriteRepository(ArticleFavoriteMapper mapper) {
+        this.mapper = mapper;
+    }
+
+    @Override
+    public void save(ArticleFavorite articleFavorite) {
+        if (!mapper.find(articleFavorite)) {
+            mapper.insert(articleFavorite);
+        }
+    }
+}

src/main/resources/db/migration/V1__create_tables.sql

@@ -20,7 +20,8 @@ create table articles (
 
 create table article_favorites (
   article_id varchar(255) not null,
-  user_id varchar(255) not null
+  user_id varchar(255) not null,
+  primary key(article_id, user_id)
 );
 
 create table follows (

src/main/resources/mapper/ArticleFavoriteMapper.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
+<mapper namespace="io.spring.infrastructure.favorite.ArticleFavoriteMapper">
+    <insert id="insert">
+        insert into article_favorites (article_id, user_id) values (#{articleFavorite.articleId}, #{articleFavorite.userId})
+    </insert>
+    <select id="find" resultType="java.lang.Boolean">
+        select count(1) from article_favorites where article_id = #{articleFavorite.articleId} and user_id = #{articleFavorite.userId}
+    </select>
+</mapper>

src/test/java/io/spring/api/ArticleFavoriteApiTest.java

@@ -0,0 +1,92 @@
+package io.spring.api;
+
+import io.restassured.RestAssured;
+import io.spring.application.article.ArticleData;
+import io.spring.application.article.ArticleQueryService;
+import io.spring.application.article.ArticleReadService;
+import io.spring.application.profile.ProfileData;
+import io.spring.core.article.Article;
+import io.spring.core.article.ArticleRepository;
+import io.spring.core.article.Tag;
+import io.spring.core.favorite.ArticleFavoriteRepository;
+import io.spring.core.user.User;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.context.embedded.LocalServerPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.when;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@RunWith(SpringRunner.class)
+public class ArticleFavoriteApiTest extends TestWithCurrentUser {
+    @MockBean
+    private ArticleFavoriteRepository articleFavoriteRepository;
+
+    @MockBean
+    private ArticleRepository articleRepository;
+
+    @MockBean
+    private ArticleQueryService articleQueryService;
+
+    protected String email;
+    protected String username;
+    protected String defaultAvatar;
+
+    @LocalServerPort
+    private int port;
+    private Article article;
+    private User anotherUser;
+
+    @Before
+    public void setUp() throws Exception {
+        RestAssured.port = port;
+        email = "john@jacob.com";
+        username = "johnjacob";
+        defaultAvatar = "https://static.productionready.io/images/smiley-cyrus.jpg";
+        userFixture(email, username, defaultAvatar);
+        anotherUser = new User("other@test.com", "other", "123", "", "");
+        article = new Article("title", "desc", "body", new String[]{"java"}, anotherUser.getId());
+        when(articleRepository.findBySlug(eq(article.getSlug()))).thenReturn(Optional.of(article));
+        ArticleData articleData = new ArticleData(
+            article.getId(),
+            article.getSlug(),
+            article.getTitle(),
+            article.getDescription(),
+            article.getBody(),
+            true,
+            1,
+            article.getCreatedAt(),
+            article.getUpdatedAt(),
+            article.getTags().stream().map(Tag::getName).collect(Collectors.toList()),
+            new ProfileData(
+                anotherUser.getId(),
+                anotherUser.getUsername(),
+                anotherUser.getBio(),
+                anotherUser.getImage(),
+                false
+            ));
+        when(articleQueryService.findBySlug(eq(articleData.getSlug()), eq(user))).thenReturn(Optional.of(articleData));
+    }
+
+    @Test
+    public void should_favorite_an_article_success() throws Exception {
+        given()
+            .header("Authorization", "Token " + token)
+            .when()
+            .post("/articles/{slug}/favorite", article.getSlug())
+            .prettyPeek()
+            .then()
+            .statusCode(201)
+            .body("article.id", equalTo(article.getId()));
+    }
+}

src/test/java/io/spring/application/article/ArticleQueryServiceTest.java

@@ -2,10 +2,14 @@ package io.spring.application.article;
 
 import io.spring.core.article.Article;
 import io.spring.core.article.ArticleRepository;
+import io.spring.core.favorite.ArticleFavorite;
+import io.spring.core.favorite.ArticleFavoriteRepository;
 import io.spring.core.user.User;
 import io.spring.core.user.UserRepository;
 import io.spring.infrastructure.article.MyBatisArticleRepository;
+import io.spring.infrastructure.favorite.MyBatisArticleFavoriteRepository;
 import io.spring.infrastructure.user.MyBatisUserRepository;
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mybatis.spring.boot.test.autoconfigure.MybatisTest;
@@ -15,13 +19,14 @@ import org.springframework.test.context.junit4.SpringRunner;
 
 import java.util.Optional;
 
+import static org.hamcrest.CoreMatchers.anyOf;
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.CoreMatchers.notNullValue;
 import static org.junit.Assert.*;
 
 @RunWith(SpringRunner.class)
 @MybatisTest
-@Import({ArticleQueryService.class, MyBatisUserRepository.class, MyBatisArticleRepository.class})
+@Import({ArticleQueryService.class, MyBatisUserRepository.class, MyBatisArticleRepository.class, MyBatisArticleFavoriteRepository.class})
 public class ArticleQueryServiceTest {
     @Autowired
     private ArticleQueryService queryService;
@@ -32,13 +37,22 @@ public class ArticleQueryServiceTest {
     @Autowired
     private UserRepository userRepository;
 
+    @Autowired
+    private ArticleFavoriteRepository articleFavoriteRepository;
+
+    private User user;
+    private Article article;
+
+    @Before
+    public void setUp() throws Exception {
+        user = new User("aisensiy@gmail.com", "aisensiy", "123", "", "");
+        userRepository.save(user);
+        article = new Article("test", "desc", "body", new String[]{"java", "spring"}, user.getId());
+        articleRepository.save(article);
+    }
+
     @Test
     public void should_fetch_article_success() throws Exception {
-        User user = new User("aisensiy@gmail.com", "aisensiy", "123", "", "");
-        userRepository.save(user);
-
-        Article article = new Article("test", "desc", "body", new String[]{"java", "spring"}, user.getId());
-        articleRepository.save(article);
 
         Optional<ArticleData> optional = queryService.findById(article.getId(), user);
         assertThat(optional.isPresent(), is(true));
@@ -48,4 +62,15 @@ public class ArticleQueryServiceTest {
         assertThat(fetched.getCreatedAt(), notNullValue());
         assertThat(fetched.getUpdatedAt(), notNullValue());
     }
+
+    @Test
+    public void should_get_article_with_right_favorite_and_favorite_count() throws Exception {
+        User anotherUser = new User("other@test.com", "other", "123", "", "");
+        userRepository.save(anotherUser);
+        articleFavoriteRepository.save(new ArticleFavorite(article.getId(), anotherUser.getId()));
+
+        ArticleData articleData = queryService.findById(article.getId(), anotherUser).get();
+        assertThat(articleData.getFavoritesCount(), is(1));
+        assertThat(articleData.isFavorited(), is(true));
+    }
 }

src/test/java/io/spring/infrastructure/favorite/MyBatisArticleFavoriteRepositoryTest.java

@@ -0,0 +1,31 @@
+package io.spring.infrastructure.favorite;
+
+import io.spring.core.favorite.ArticleFavorite;
+import io.spring.core.favorite.ArticleFavoriteRepository;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mybatis.spring.boot.test.autoconfigure.MybatisTest;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.*;
+
+@RunWith(SpringRunner.class)
+@MybatisTest
+@Import({MyBatisArticleFavoriteRepository.class})
+public class MyBatisArticleFavoriteRepositoryTest {
+    @Autowired
+    private ArticleFavoriteRepository articleFavoriteRepository;
+
+    @Autowired
+    private ArticleFavoriteMapper articleFavoriteMapper;
+
+    @Test
+    public void should_save_and_fetch_articleFavorite_success() throws Exception {
+        ArticleFavorite articleFavorite = new ArticleFavorite("123", "456");
+        articleFavoriteRepository.save(articleFavorite);
+        assertThat(articleFavoriteMapper.find(articleFavorite), is(true));
+    }
+}