javascript - KnockoutJs 1.3 beta. _destroy:false has same result on ui as _destroy:true -

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using asp.net mvc, passing viewmodel down , getting knockout map viewmodel , bind this.

this working fine me, trying track deletions.

i thought able adding _destroy property setting false.

i hoped ui ignore until destroy set true.

but not seem case , mere presence of property causing treated destroyed.

is bug or handling wrong?

many thanks, kohan

  var model = [{"id":1,"name":"bikes","parent":null,"_destroy":false},   {"id":2,"name":"components","parent":null,"_destroy":false},   {"id":3,"name":"clothing","parent":null,"_destroy":false},   {"id":4,"name":"accessories","parent":null,"_destroy":false},   {"id":5,"name":"mountain bikes","parent":1,"_destroy":false},   {"id":6,"name":"road bikes","parent":1,"_destroy":false},   {"id":7,"name":"touring bikes","parent":1,"_destroy":false},   {"id":8,"name":"handlebars","parent":2,"_destroy":false}] ;

none of above elements show. "_destroy": null has same effect.

working example of problem...

http://jsfiddle.net/jy53e/6/

update: seems issue mapping extension.

what happening sending _destroy through mapping plugin , coming out observable. knockout not expect observable (a function), when check if (_destroy) result true, because _destroy function , not unwrapped see value.

you can like: http://jsfiddle.net/rniemeyer/jy53e/7/ prevent _destroy getting made observable.

so, use mapping options:

var mappingoptions = {     create: function(options) {         return ko.mapping.fromjs(options.data, { copy: ["_destroy"] });      } };

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