How to set default selected dropdown with different values from same source - angularjs

Question

I have an JSON array from where i am creating Dropdown and default selected using ng-model
$scope.repeats = [{
'title': 'Never',
'value': 'Never'
}, {
'title': 'Daily',
'value': 'Daily'
}, {
'title': 'Weekdays (M-F)',
'value': 'Weekdays'
}, {
'title': 'Weekly',
'value': 'Weekly'
}, {
'title': 'Monthly',
'value': 'Monthly'
}, {
'title': 'Yearly',
'value': 'Yearly'
}, {
'title': 'Hourly',
'value': 'Hourly'
}, {
'title': 'Minutely',
'value': 'Minutely'
}];
$scope.def_sele = $scope.repeats[0]
In the view:
<select ng-model="def_sele" ng-options="repeat.title for repeat in repeats"></select>
From the above code the default selected dropdown is Daily. Till here it was all fine.
But i am creating an TODO application where each TODO has different selection(Never, Daily etc.. from above $scope.repeats)
So, how to set default selected for each TODO ????? Because the above example i've given it applies every where and i get Daily selected on each TODO, but i want to select different different for each TODO, how to do that????
Updated
My code is like:
<ul ng-repeat="todo in todos_detail">
<select ng-model="todo.dropdown_position_index" ng-options="repeat.title for repeat in repeats"></select>
</ul>
In the above example for each todo has a different dropdown_position_index, so i want the dropdown is selected = selected using todo.dropdown_position_index.

Answer 1

You need to make sure the value you're selecting in your <select> lines up with the value in your selected todo.
I haven't seen your code, so I put together a working example in jsbin.
The basic idea is this:
<select ng-model="X" ng-options="x.A as x.B for x in Z"></select>
Where:
Z = your collection of options
x = an individual item variable from Z
x.A = the value of the option
x.B = the text of the option
X = the value to update AND read from
as long as the array Z has an object in it x where the property x.A is equal to X, it will be selected.
... or for a less confusing answer, check the code example. ;)
Best of luck

Answer 2

given for the example object structure
$scope.todos = [{
'title': 'Weekly',
'value': 'Weekly'
}, {
'title': 'Yearly',
'value': 'Yearly'
}];
you could do something like this
<div ng-repeat="todo in todos">
<select ng-model="todo.value" ng-options="repeat.value as repeat.title for repeat in repeats"></select>
</div>
here an example plunker