Vue.js $set on array element does not trigger notification -

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i have vue instance data contains array of objects. display data in table without issue.

upon clicking table rows, set "selected" property on corresponding data object using:

key.$set('testing', testing);

upon setting value, add custom css class the table row, without issue.

however, if simple output of entire array of objects @ bottom of page (such below), doesn't updated reflect new "testing" attribute have added.

{{ griddata | json }}

i able reproduce question using modified vue.js example code in jsfiddle:

https://jsfiddle.net/wdmatl/531axrtt/

notice when click on rows of data, either see "testing" or "not testing". new object data isn't reflected in json @ bottom of page. why not?


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