Filtering a object with query that contains reference to nested object

Question

I need to write a filter function that will allow me to query by nested object, like this:

var data = [
             { twitter: { id: 1, name: "Bob" } },
             { twitter: { id: 2, name: "Jones" } }
           ],
    query = { 'twitter.id': 1 };

# Perform filter using data and query variables
var search = …

console.log(search);
> ["0"]

The filter should return an array of indexes that match the query.

I currently have this working without nested object support at http://jsbin.com/umeros/2/edit.

However, I would like to be able to query for nested objects, such as the query seen above.

@OliverJosephAsh: Why not? Convert string in dot notation to get the object reference is exactly what you want. — Bergi
– Bergi, Commented Feb 24, 2013 at 21:21
@Bergi It explains how to convert the string into dot notation but that doesn't help me write the filter function. — user1082754
– user1082754, Commented Feb 24, 2013 at 21:23

Community · Accepted Answer · 2017-05-23 10:28:17Z

1

Using the function ref from this answer, your filter should look like this:

var search = _.filter(_.keys(data), function (key) {
    var obj = data[key];
    return _.every(query, function (val, queryKey) {
        return ref(obj, queryKey) === val;
    });
});

edited May 23, 2017 at 10:28

CommunityBot

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answered Feb 24, 2013 at 21:30

Bergi

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6 Comments

user1082754 Over a year ago

This will only work for one property in query: jsbin.com/uqabog/1/edit. Can you think of a solution that will work with multiple properties in query?

user1082754 Over a year ago

I'm a bit confused now (sorry) but I seem to have got it working in ES5 (which is what I started with): jsbin.com/umeros/9/edit. Thanks.

Bergi Over a year ago

It does for multiple. Only every expects you to return true, otherwise it breaks the loop since it already knows that not every item fulfils the condition.

Bergi Over a year ago

Yeah, that's the ES5 variant. Only you tagged your question underscore.js, so I used the cross-browser functions (and _.every works directly on objects as well)

user1082754 Over a year ago

What can I do to prevent it erroring when data contains an object that does not match the query? I.e. jsbin.com/umeros/11/edit

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