Initializing the MongoDB database

With the JPA implementation, we used the data.sql file to initialize the data in our database. For MongoDB implementation, we can remove the data.sql file and replace it with a Java configuration file, which we will call MongoDataInitializer.java:

    //src/main/java/com/packtpub/springsecurity/configuration/
    MongoDataInitializer.java

    …
    @Configuration
    public class MongoDataInitializer {
       @Autowired
       private RoleRepository roleRepository;
       @Autowired
       private CalendarUserRepository calendarUserRepository;
       @Autowired
       private EventRepository eventRepository;
       @PostConstruct
       public void setUp() {
           calendarUserRepository.deleteAll();
           roleRepository.deleteAll();
           eventRepository.deleteAll();
           seedRoles();
           seedCalendarUsers();
           seedEvents();
       }
       CalendarUser user1, admin, user2;
       {
           user1 = new CalendarUser(0, "user1@example.com",
           "$2a$04$qr7RWyqOnWWC1nwotUW1nOe1RD5.mKJVHK16WZy6v49pymu1WDHmi",
           "User","1");
           admin = new   CalendarUser(1,"admin1@example.com",
           "$2a$04$0CF/Gsquxlel3fWq5Ic/ZOGDCaXbMfXYiXsviTNMQofWRXhvJH3IK",
           "Admin","1");
           user2 = new CalendarUser(2,"user2@example.com",
           "$2a$04$PiVhNPAxunf0Q4IMbVeNIuH4M4ecySWHihyrclxW..PLArjLbg8CC",
           "User2","2");
       }
       Role user_role, admin_role;
       private void seedRoles(){
           user_role = new Role(0, "ROLE_USER");
           admin_role = new Role(1, "ROLE_ADMIN");
           user_role = roleRepository.save(user_role);
           admin_role = roleRepository.save(admin_role);
       }
       private void seedEvents(){
           // Event 1
           Event event1 = new Event(100, "Birthday Party", "This is 
           going to be a great birthday", new 
           GregorianCalendar(2017,6,3,6,36,00), user, admin);
           // Event 2
           Event event2 = new Event(101, "Conference Call", 
           "Call with the client",new 
           GregorianCalendar(2017,11,23,13,00,00),user2, user);
           // Event 3
           Event event3 = new Event(102, "Vacation",
           "Paragliding in Greece",new GregorianCalendar(2017,8,14,11,30,00),
           admin, user2);
           // Save Events
           eventRepository.save(event1);
           eventRepository.save(event2);
           eventRepository.save(event3);
       }
       private void seedCalendarUsers(){
           // user1
           user1.addRole(user_role);
          // admin2
           admin.addRole(user_role);
           admin.addRole(admin_role);
           // user2
           user2.addRole(user_role);
           calendarUserRepository.save(user1);
           calendarUserRepository.save(admin);
           calendarUserRepository.save(user2);
       }
    }

This will be executed at load time and will seed the same data into our MongoDB as we did with our H2 database.