Update validateConfirmation to support confirmation against fields on ember-data objects

addon/validators/confirmation.js

@@ -6,7 +6,14 @@ export default function validateConfirmation(options = {}) {
     // Combine the changes on top of the content so that we evaluate against both default values
     // and valid changes. `changes` only has valid changes that have been made and won't include
     // default values
-    let model = Object.assign({}, content, changes);
+    let model;
+
+    if ('_internalModel' in content) {
+      const contentHash = content._internalModel.createSnapshot().attributes();
+      model = Object.assign({}, contentHash, changes);
+    } else {
+      model = Object.assign({}, content, changes);
+    }
 
     let result = evValidateConfirmation(newValue, options, model, key);
     return result === true ? true : buildMessage(key, result);

tests/unit/validators/confirmation-test.js

@@ -89,3 +89,27 @@ test('It looks for default values as well as "changes" values', function (assert
   );
   assert.true(validator(key, password, undefined, {}, content));
 });
+
+test('It handles ember data models when looking for default values as well as "changes" values', function (assert) {
+  assert.expect(2);
+
+  let password = '1234567';
+  let content = {
+    _internalModel: {
+      createSnapshot: () => ({
+        attributes: () => ({
+          password,
+        }),
+      }),
+    },
+  };
+  let key = 'passwordConfirmation';
+  let opts = { on: 'password' };
+  let validator = validateConfirmation(opts);
+
+  assert.strictEqual(
+    validator(key, 'foo', undefined, {}, content),
+    buildMessage(key, { type: 'confirmation', context: opts })
+  );
+  assert.true(validator(key, password, undefined, {}, content));
+});