Fix ds-error validator for handling nested objects (#111)

This change broke the ds-error validator behaviour when handling nested objects f829984

addon/ds-error.js

@@ -1,4 +1,5 @@
 import validationError from 'ember-validators/utils/validation-error';
+import { get } from '@ember/object';
 
 /**
  *  @class DS Error
@@ -15,7 +16,7 @@ import validationError from 'ember-validators/utils/validation-error';
 export default function validateDsError(value, options, model, attribute) {
   let { path, key } = getPathAndKey(attribute);
 
-  let errors = model[path];
+  let errors = get(model, path);
 
   if (errors && errors.has && errors.has(key)) {
     let errorsFor = errors.errorsFor(key);

tests/unit/validators/ds-error-test.js

@@ -46,6 +46,25 @@ test('it works', function (assert) {
   assert.strictEqual(processResult(result), 'Username is not unique');
 });
 
+test('it works with nested objects', function (assert) {
+  assert.expect(2);
+
+  model = EmberObject.create({
+    foo: {
+      errors: new DSErrors(),
+      username: null,
+    },
+  });
+
+  result = validate(undefined, undefined, model, 'foo.username');
+  assert.true(processResult(result));
+
+  model.get('foo.errors').set('username', 'Username is not unique');
+
+  result = validate(undefined, undefined, model, 'foo.username');
+  assert.strictEqual(processResult(result), 'Username is not unique');
+});
+
 test('gets last message', function (assert) {
   assert.expect(2);