ng-model data not getting when saving the data - angularjs

Question

here save the ng-model is newattendance saving to database. "newattendance._id" is not taken as a ng-model.how to make it "newattendance._id" is ng-model
<select class="form-control" ng-options="item.empcode as item.empcode for item in totemplist" ng-model="item.empcode">
</select>
<input type="text" ng-repeat="newattendance in totemplist" ng-model="newattendance._id" ng-show="item.empcode ==newattendance.empcode" style="width:200px;" ><br>
<input placeholder="Enter Attendacne Date" ng-model="newattendance.doa">
<button class="btn btn-primary" ng-click="checkOut()">checkOut</button>
Controller
EmpMasterController.controller("AttendanceController", ['$scope', 'AttendanceFactory',"EmpAddService", function($scope, AttendanceFactory,EmpAddService){
$scope.newattendance={};
$scope.totemplist=EmpAddService.getAllEmpAddItems();
console.log($scope.totemplist);
$scope.checkIn = function(){
AttendanceFactory.addAttendance($scope.newattendance);
$scope.newattendance = {}
}
$scope.getAllAttendance = function(){
console.log("$$$$$"+$scope.newattendance._id)
$scope.attendancedetails =AttendanceFactory.getAllAttendance($scope.newattendance._id);
}
}])
Factory
EmpFactModule.factory("AttendanceFactory", function($resource, RES_URL){
var attendanceResource = $resource(RES_URL+"attandence/:id/:attid",
{"id": "#id", "attid": "#attid"}, {update: {method: "PUT"}})
var attendanceDetails;
return {
addAttendance: function(newattendance){
console.log("..1.. " + newattendance._id)
attendanceResource.save({"id":newattendance._id}, newattendance, function(data){
console.log("Add Success ")
}, function(data, status){
console.log("Add Failed*****");
})
},
getAllAttendance: function(_id){
console.log("..#.. " + _id)
attendanceDetails = attendanceResource.query({"id": _id});
return attendanceDetails;
},
}
})
please help me how make it as ng-model and how to save this...

Answer 1

I've create a JSFiddle for you which hopefully will help you understand the 2 way binding in angular.
you dont need to pass the newattendance object to the check-out function, it is already saved on the scope.
HTML:
<div ng-app="app">
<div ng-controller="formValidation">
<div>
<div>
<span>User Name</span>
<input type="text" placeholder="John" ng-model="newattendance._id">
<span>
<button ng-click="submit()">
check out
</button>
</span>
</div>
</div>
<pre>{{newattendance._id}}</pre>
</div>
</div>
JS:
var app = angular.module('app', []);
app.controller('formValidation', function($scope) {
$scope.submit=function(){
var formPost = {
"Username":$scope.newattendance._id
};
console.log(formPost);
}
});