"click .delall": function() {
Tasks.find({owner: Meteor.userId(), checked: true}).forEach(function(item, value, counter) {
Tasks.remove({_id: item._id});
});
}
"click .delall": function() {
var person = Tasks.findOne({owner: Meteor.userId()});
Tasks.remove({_id: person._id}, {checked: true});
}
Сделал так