问题:

Is there a way to use _.omit on nested object properties?

I want this to happen:

schema = {
  firstName: {
    type: String
  },
  secret: {
    type: String,
    optional: true,
    private: true
  }
};

schema = _.nestedOmit(schema, 'private');

console.log(schema);
// Should Log
// {
//   firstName: {
//     type: String
//   },
//   secret: {
//     type: String,
//     optional: true
//   }
// }

_.nestedOmit obviously doesn't exist and just _.omit doesn't affect nested properties, but it should be clear what I'm looking for.

It also doesn't have to be underscore, but in my experience it often just makes things shorter and clearer.

回答1:

You could create a nestedOmit mixin that would traverse the object to remove the unwanted key. Something like

_.mixin({
    nestedOmit: function(obj, iteratee, context) {
        // basic _.omit on the current object
        var r = _.omit(obj, iteratee, context);

        //transform the children objects
        _.each(r, function(val, key) {
            if (typeof(val) === "object")
                r[key] = _.nestedOmit(val, iteratee, context);
        });

        return r;
    }
});

and a demo http://jsfiddle.net/nikoshr/fez3eyw8/1/