android - Ormlite - deleting nested objects from ForeignCollection but not from database -


i have contactitem contains foreigncollection of groupitem:

public class contactitem implements parcelable{     @databasefield(generatedid = true)     private integer id;     @databasefield(datatype = datatype.string, columnname = constants.contact_name)     private string name;     @databasefield(datatype = datatype.string, columnname = constants.contact_number)     private string number;     @databasefield(datatype = datatype.integer, columnname = constants.contact_icon)     private int icon;     @databasefield(datatype = datatype.integer, columnname = constants.contact_days)     private int days;     @databasefield(foreign=true,canbenull = true,foreignautorefresh = true,columnname = constants.contact_group)     private groupitem group;     @foreigncollectionfield(columnname = constants.contact_group_list)     private foreigncollection<groupitem> groups; }

and groupitem, contains foreigncollection of contactitem:

public class groupitem implements  parcelable{     @databasefield(generatedid = true)     private integer id;     @databasefield(datatype = datatype.string, columnname = constants.group_name)     private string name;     @databasefield(datatype = datatype.integer, columnname = constants.group_icon)     private int icon;     @databasefield(datatype = datatype.integer, columnname = constants.group_count)     private int count;     @databasefield(foreign=true,canbenull = true,foreignautorefresh = true, columnname = constants.group_contact)     private contactitem contact;     @foreigncollectionfield(eager = true, columnname=constants.group_contacts_list)     private foreigncollection<contactitem> contacts;     @databasefield(datatype = datatype.integer, columnname = constants.group_days)     private int days; }

and need delete contactitem groupitem's foreigncollection of contactitems. that: 

  public void removecontactfromgroup(groupitem group, contactitem contact)         {             databasehandler db = new databasehandler(context.getapplicationcontext());             dao<groupitem,integer> daogroup = null;             dao<contactitem,integer> daocontact = null;             groupitem newgroup = null;              try {                  daogroup = db.getgroupdao();                  daocontact = db.getcontactdao();                  updatebuilder<groupitem, integer> updatebuilder = daogroup.updatebuilder();                  newgroup = daogroup.queryforid(group.getid());                  if ( newgroup.getcontactcollection().contains(contact))                  {                    }              }              catch(exception e)              {                  log.i(" savegroupcontacts database problem","fuck cause problem");                  e.printstacktrace();              }         }

but delets contactitem whole database. need remove foreigncollection. how can implement this?

i solved issue maybe not elegant, workable solution : set nested object in those, contains null , update object-container dao : 

public void removecontactfromgroup(groupitem group, contactitem contact)         {             databasehandler db = new databasehandler(context.getapplicationcontext());             dao<groupitem,integer> daogroup = null;             dao<contactitem,integer> daocontact = null;             groupitem newgroup = null;             contactitem contactfromdb = null;              try {                  daogroup = db.getgroupdao();                  daocontact = db.getcontactdao();                  updatebuilder<groupitem, integer> updatebuilder = daogroup.updatebuilder();                  newgroup = daogroup.queryforid(group.getid());                  contactfromdb = daocontact.queryforid(contact.getid());                  contactfromdb.setcontactgroup(null);                  daocontact.update(contactfromdb);               }              catch(exception e)              {                  log.i(" savegroupcontacts database problem","fuck cause problem");                  e.printstacktrace();              }         }

worked me.


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