Full Stack Reddit Clone – Spring Boot, React, Electron App – Part 2

Introduction

Welcome to Part 2 of creating a Reddit clone using Spring Boot, and React.

In Part 1 we initialized our project, and added all of the dependencies we will need. In this article we will cover creating all of the entities and repositories we will need to complete our backend!

Important Links

• Backend Source: https://github.com/MaxiCB/vox-nobis/tree/master/backend
• Frontend Source: https://github.com/MaxiCB/vox-nobis/tree/master/client
• Live URL: In Progress

Part 1: Creating Domain Entities

Let’s cover all of the different domain entities our application will have. Inside com.your-name.backend create a new package called models, and add the following classes.

Note: We installed Lombok as a dependency in part 1. We will be using varying Lombok Annotations throughout the development process. To access these annotations you will have to enable Annotation Processing in your IDE. For further instructions on this, you can view the Setting up Lombok guide here – https://www.baeldung.com/lombok-ide

Note: In some cases you may need to add the following dependency to your pom.xml file for field validation

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

Enter fullscreen mode Exit fullscreen mode

• User: Have a unique userId, a username, password, emailAddress, creationDate, accountStatus

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;

    import javax.persistence.*;
    import javax.validation.constraints.Email;
    import javax.validation.constraints.NotBlank;
    import java.time.Instant;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Table(name = "users")
    @Entity
    public class User {
        @Id
        @SequenceGenerator(name = "USER_GEN", sequenceName = "SEQ_USER", allocationSize = 1)
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "USER_GEN")
        private Long userId;
        @NotBlank(message = "Username is required")
        private String username;
        @NotBlank(message = "Password is required")
        private String password;
        @Email
        @NotBlank(message = "Email is required")
        private String email;
        private Instant creationDate;
        private boolean accountStatus;
    }

Enter fullscreen mode Exit fullscreen mode

• Post: Have a unique postId, postName, url, description, voteCount, user, creationDate, subreddit

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    import org.springframework.lang.Nullable;

    import javax.persistence.*;
    import javax.validation.constraints.NotBlank;
    import java.time.Instant;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @Entity
    public class Post {
        @Id
        @SequenceGenerator(name = "POST_GEN", sequenceName = "SEQ_POST", allocationSize = 1)
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "POST_GEN")
        private Long postId;
        @NotBlank(message = "Post Title is required")
        private String postTitle;
        @Nullable
        private String url;
        @Nullable
        @Lob
        private String description;
        private Integer voteCount;
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "userId", referencedColumnName = "userId")
        private User user;
        private Instant creationDate;
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "id", referencedColumnName = "id")
        private Subreddit subreddit;
    }

Enter fullscreen mode Exit fullscreen mode

• Subreddit: Have a unique id, name, description, posts, creationDate, users

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;

    import javax.persistence.*;
    import javax.validation.constraints.NotBlank;
    import java.time.Instant;
    import java.util.List;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @Entity
    public class Subreddit {
        @Id
        @SequenceGenerator(name = "SUB_GEN", sequenceName = "SEQ_SUB", allocationSize = 1)
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SUB_GEN")
        private Long id;
        @NotBlank(message = "Subreddit name is required")
        private String name;
        @NotBlank(message = "Subreddit description is required")
        private String description;
        @OneToMany(fetch = FetchType.LAZY)
        private List<Post> posts;
        private Instant creationDate;
        @ManyToOne(fetch = FetchType.LAZY)
        private User user;
    }

Enter fullscreen mode Exit fullscreen mode

• Vote: Have a unique id, post, user

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;

    import javax.persistence.*;
    import javax.validation.constraints.NotNull;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @Entity
    public class Vote {
        @Id
        @GeneratedValue(strategy = GenerationType.SEQUENCE)
        private Long voteId;
        private VoteType voteType;
        @NotNull
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "postId", referencedColumnName = "postId")
        private Post post;
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "userId", referencedColumnName = "userId")
        private User user;
    }

Enter fullscreen mode Exit fullscreen mode

• Comment: Have a unique id, text, post, creationDate, user

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;

    import javax.persistence.*;
    import javax.validation.constraints.NotEmpty;
    import java.time.Instant;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @Entity
    public class Comment {
        @Id
        @GeneratedValue(strategy = GenerationType.SEQUENCE)
        private Long id;
        @NotEmpty
        private String text;
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "postId", referencedColumnName = "postId")
        private Post post;
        private Instant creationDate;
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "userId", referencedColumnName = "userId")
        private User user;
    }

Enter fullscreen mode Exit fullscreen mode

• VoteType ENUM: Upvote, Downvote

    public enum VoteType {
        UPVOTE(1), DOWNVOTE(-1);

        VoteType(int direction) {}
    }

Enter fullscreen mode Exit fullscreen mode

• AccountVerificationToken: Have a unique id, token, user, expirationDate

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;

    import javax.persistence.*;
    import java.time.Instant;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @Table(name = "token")
    @Entity
    public class AccountVerificationToken {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;
        private String token;
        @OneToOne(fetch = FetchType.LAZY)
        private User user;
        private Instant expirationDate;
    }

Enter fullscreen mode Exit fullscreen mode

• NotificationEmail: subject, recepient, body

  package com.maxicb.backend.model;

    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class NotificationEmail {
        private String subject;
        private String recepient;
        private String body;
    }

Enter fullscreen mode Exit fullscreen mode

Part 2: Creating Repositories ‍

Now we need to cover the repositories which will be responsible for storing the entites in the database. Inside com.you-name.backend create a new package called repository, and add the following interfaces.

• User Repository:

    package com.maxicb.backend.repository;

    import com.maxicb.backend.model.User;
    import org.springframework.data.repository.CrudRepository;

    import java.util.Optional;

    public interface UserRepository extends CrudRepository<User, Long> {
        Optional<User> findByUsername(String username);
    }

Enter fullscreen mode Exit fullscreen mode

• Post Repository:

    package com.maxicb.backend.repository;

    import com.maxicb.backend.model.Post;
    import com.maxicb.backend.model.Subreddit;
    import com.maxicb.backend.model.User;
    import org.springframework.data.repository.CrudRepository;

    import java.util.List;

    public interface PostRepository extends CrudRepository<Post, Long> {
        List<Post> findAllBySubreddit(Subreddit subreddit);

        List<Post> findByUser(User user);
    }

Enter fullscreen mode Exit fullscreen mode

• Subreddit Repository:

  package com.maxicb.backend.repository;

  import com.maxicb.backend.model.Subreddit;
  import org.springframework.data.repository.CrudRepository;

  import java.util.Optional;

  public interface SubredditRepository extends CrudRepository<Subreddit, Long> {
      Optional<Subreddit> findByName(String subredditName);
  }

Enter fullscreen mode Exit fullscreen mode

• Vote Repository:

    package com.maxicb.backend.repository;

    import com.maxicb.backend.model.Post;
    import com.maxicb.backend.model.User;
    import com.maxicb.backend.model.Vote;
    import org.springframework.data.repository.CrudRepository;

    import java.util.Optional;

    public interface VoteRepository extends CrudRepository<Vote, Long> {
        Optional<Vote> findTopByPostAndUserOrderByVoteIdDesc(Post post, User currentUser);
    }

Enter fullscreen mode Exit fullscreen mode

• Comment Repository:

    package com.maxicb.backend.repository;

    import com.maxicb.backend.model.Comment;
    import com.maxicb.backend.model.Post;
    import com.maxicb.backend.model.User;
    import org.springframework.data.repository.CrudRepository;

    import java.util.List;

    public interface CommentRepository extends CrudRepository<Comment, Long> {
        List<Comment> findByPost(Post post);

        List<Comment> findAllByUser(User user);
    }

Enter fullscreen mode Exit fullscreen mode

• Token Repository:

  package com.maxicb.backend.repository;

import com.maxicb.backend.model.AccountVerificationToken;
import org.springframework.data.repository.CrudRepository;

import java.util.Optional;

public interface TokenRepository extends CrudRepository<AccountVerificationToken, Long> {
    Optional<AccountVerificationToken> findByToken(String token);
}

Enter fullscreen mode Exit fullscreen mode

Conclusion

• To ensure everything is configured correctly you can run the application, and ensure there are no error in the console. Towards the bottom of the console you should see output similar to below

• In this article we created the entities, and repositories needed within our Spring Boot backend. Laying the foundation for all of the logic that will follow.

Next

Part 3 Implementing registration, email sending, and account activation/verification.

原文链接：Full Stack Reddit Clone – Spring Boot, React, Electron App – Part 2