Post.java

package com.sopromadze.blogapi.model.post;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;

import com.fasterxml.jackson.annotation.JsonIdentityInfo;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.sopromadze.blogapi.model.audit.UserDateAudit;
import com.sopromadze.blogapi.model.category.Category;
import com.sopromadze.blogapi.model.comment.Comment;
import com.sopromadze.blogapi.model.tag.Tag;
import com.sopromadze.blogapi.model.user.User;

@Entity
@Table(name = "posts", uniqueConstraints = { @UniqueConstraint(columnNames = { "title" }) })
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Post extends UserDateAudit {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;

	@Column(name = "title")
	private String title;

	@Column(name = "body")
	private String body;

	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "user_id")
	private User user;

	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "category_id")
	private Category category;

	@JsonIgnore
	@OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
	private List<Comment> comments;

	@ManyToMany(fetch = FetchType.LAZY)
	@JoinTable(name = "post_tag", joinColumns = @JoinColumn(name = "post_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "tag_id", referencedColumnName = "id"))
	private List<Tag> tags;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getBody() {
		return body;
	}

	public void setBody(String body) {
		this.body = body;
	}

	@JsonIgnore
	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

	public List<Comment> getComments() {
		return comments == null ? null : new ArrayList<>(comments);
	}

	public void setComments(List<Comment> comments) {
		if (comments == null) {
			this.comments = null;
		} else {
			this.comments = Collections.unmodifiableList(comments);
		}
	}

	public Category getCategory() {
		return category;
	}

	public void setCategory(Category category) {
		this.category = category;
	}

	public List<Tag> getTags() {
		return tags == null ? null : new ArrayList<>(tags);
	}

	public void setTags(List<Tag> tags) {
		if (tags == null) {
			this.tags = null;
		} else {
			this.tags = Collections.unmodifiableList(tags);
		}
	}
}