android - How make relationship between two entities - Sugar ORM -

i use sugar orm in android app , know how make relationship between entities. thing have more emails , phone numbers (work, personal, home)

i have tried this:

i can add this..

contact contact = new contact(); contactitem contactitem = new contactitem(); contactitem.settype(1); contact.getitems.add(contactitem); 

but when want load, have error. class cannot read sqlite3 database.

contact

public class contact extends sugarrecord {      private string name;     private string phonenumber;     private string email;     private boolean favourite;     private string imagepath;     @ignore private boolean visiblefirstletter;      public list<contactitem> items;      public contact() {         //empty constructor     }      public contact(string name, string number, string email, boolean favourite, string imagepath) {         this.name = name;         this.phonenumber = number;         this.email = email;         this.favourite = favourite;         this.imagepath = imagepath;         this.items = new arraylist<>();     }      public void setname(string name) {this.name = name; }      public void setemail(string email) {         this.email = email;     }      public void setphonenumber(string phonenumber) {         this.phonenumber = phonenumber;     }      public void setfavourite(boolean favourite) {         this.favourite = favourite;     }      public void setvisiblefirstletter(boolean visiblefirstletter) {         this.visiblefirstletter = visiblefirstletter;     }     public string getname() {         return name;     }      public string getemail() { return email; }      public string getphonenumber() {         return phonenumber;     }      public boolean isfavourite() { return favourite; }      public boolean isvisiblefirstletter() {         return visiblefirstletter;     }      public string getimagepath() { return imagepath; }      public void setimagepath(string imagepath) { this.imagepath = imagepath; }      public list<contactitem> getitems() {         return items;     } } 

items

public class contactitem {      string content;     integer type;     contact contact;       public static final integer home = 0;     public static final integer work = 1;     public static final integer email = 2;     public static final integer fax = 3;      public contactitem() {         //empty constructor     }     public contactitem(integer type, string content) {         this.type = type;         this.content = content;     }      public void settype(integer type) {         this.type = type;     }      public void setcontent(string content) {         this.content = content;     }      public string getcontent() { return content; }      public integer gettype() { return type; }      public contact getcontact() { return contact; }      public void setcontact(contact contact) { this.contact = contact; } } 

generally, should initialized contact before find or update this. can contact have method getname() null.

in case, model.contact.getname()is null object reference.

so, should check code:

contact contact = new contact("stepan", "09293293", stepan.stack@gmail.com, true); contact.save(); contact contact = sugarrecord.findbyid(contact.class, (long) 1); 

or

you should tried code load contacts, seem findbyid rows in contact:

list<contact> contacts = sugarrecord.listall(contact.class);

in debugger android studio, please watch values. can incorrect in data.