Joerg Joerg - 1 month ago 7
Javascript Question

Underscore.js - filtering in a nested Json

I want to get all values, where the category.id = 1 so i should get 2 results

My JSON looks like this:

var test = [
{
"id": 1,
"name": "name1",
"value": "value1",
"category": {
"id": 1,
"name": "category1"
}
},
{
"id": 2,
"name": "name2",
"value": "value2",
"category": {
"id": 1,
"name": "category1"
}
},
{
"id": 3,
"name": "name3",
"value": "value3",
"category": {
"id": 2,
"name": "category2"
}
}
];


my JavaScript looks like this:

var x = _.filter(test,
function (innerObject) {
return _.filter(innerObject,
function (category) {
return category.id === 1;
});
});

console.log(x);


I made a JS Fiddle but i get everytime all 3 elements back... not only the 2 correct ones!

I tried also something like

var x = _.where(test, {"category":{"id":2}});
console.log(x);


what seems to be logical for me, but the array is always empty

another jsFiddle

I hope somebody can tell me what i made wrong...

Thank You!

Answer

That's because with where you're searching for an element that is EXACTLY like {"category":{"id":1}} and your object is {"category":{"id":1,"name":"category1"}}

Try

_.filter(test, function(a){ return a.category && a.category.id === 1; });