@Override
public boolean equals(Object obj) {
if (obj == null) return false;
if (obj == this) return true;
if (!obj.getClass().isAssignableFrom(getClass())) return false;
Post otherPost = (Post) obj;
return new EqualsBuilder()
.append(this.getTitle(), otherPost.getTitle())
.append(this.getAuthor(), otherPost.getAuthor())
.append(this.getCreationDate(), otherPost.getCreationDate())
.append(this.getState(), otherPost.getState())
.isEquals();
}