dataPath of additionalProperties is empty

[shachr]

i would like to remove all additional properties but dataPath is always empty when err type is additionalProperties!

[epoberezkin]

I suspect I may have recently fixed the issue with incorrect dataPath reporting in version 0.4.9 (it was issue #9).

Please try using the latest version (0.4.10 - there is another important fix). If you are still seeing the issue please post your schema, data and results (errors) here.

Thanks for helping me making it better ;)

[epoberezkin]

Ok, I've figured what it was about.
The choice I've made was to put the object path in dataPath rather than the property, because it is the object that is being validated rather than its property.
So if you had additionalProperty keyword in some sub-object, you would have it's path in dataPath.
Although this is more consistent with the rest of the validation keywords, I agree that it is useful to have the actual additional property in error.dataPath.

So I added it in 0.4.15.

var schema = {
  properties: {
    foo: {},
    bar: {}
  },
  additionalProperties: false
};

var data = { foo: 1, bar: 2, baz: 3, quux: 4 };

var ajv = Ajv({allErrors: true});
var valid = ajv.validate(schema, data);
console.log(ajv.errors);

There will be two errors in the array, with dataPaths "['baz']" and "['.quux']". (It would have been easy to replace them with ".baz" and ".quux", but as it's not a compile time replacement, I decided to keep it faster - you can map/slice your properties out of these errors.

So if you want to remove additional properties you could do smth like this:

ajv.errors
.filter(function(err) { return err.keyword == 'additionalProperties'; })
.map(function(err) { return err.dataPath.slice(2,-2); })
.forEach(function(p) { delete data[p]; });

It'll be just a bit more complex for properties in sub-objects.