add key-in helper

README.md

@@ -17,6 +17,7 @@ gte      | `if (a >= b)`                        | `{{if (gte a b)}}`
 lt       | `if (a < b)`                         | `{{if (lt a b)}}`
 lte      | `if (a <= b)`                        | `{{if (lte a b)}}`
 is-array | `if (Ember.isArray(a))`              | `{{if (is-array a)}}`
+key-in   | `if (key in a)`                      | `{{if (key-in 'key' a)}}`
 
 ## Install
 

addon/helpers/key-in.js

@@ -0,0 +1,4 @@
+
+export function keyIn(params) {
+  return params[0] in params[1];
+}

app/helpers/key-in.js

@@ -0,0 +1,12 @@
+import Ember from 'ember';
+export { keyIn } from 'ember-truth-helpers/helpers/key-in';
+
+var forExport = null;
+
+if (Ember.Helper) {
+  forExport = Ember.Helper.helper(keyIn);
+} else if (Ember.HTMLBars.makeBoundHelper) {
+  forExport = Ember.HTMLBars.makeBoundHelper(keyIn);
+}
+
+export default forExport;

app/initializers/truth-helpers.js

@@ -11,6 +11,7 @@ import { gtHelper } from 'ember-truth-helpers/helpers/gt';
 import { gteHelper } from 'ember-truth-helpers/helpers/gte';
 import { ltHelper } from 'ember-truth-helpers/helpers/lt';
 import { lteHelper } from 'ember-truth-helpers/helpers/lte';
+import { keyInHelper } from 'ember-truth-helpers/helpers/key-in';
 
 export function initialize(/* container, application */) {
 
@@ -30,6 +31,7 @@ export function initialize(/* container, application */) {
   registerHelper('gte', gteHelper);
   registerHelper('lt', ltHelper);
   registerHelper('lte', lteHelper);
+  registerHelper('key-in', keyInHelper);
 }
 
 export default {

tests/unit/helpers/key-in-test.js

@@ -0,0 +1,29 @@
+import Ember from 'ember';
+import { moduleForComponent, test } from 'ember-qunit';
+import { registerHelper } from 'ember-truth-helpers/utils/register-helper';
+import {
+  keyIn
+} from 'ember-truth-helpers/helpers/key-in';
+
+moduleForComponent('key-in', 'helper:key-in', {
+  integration: true,
+  beforeEach: function() {
+    // Do not register helpers from Ember 1.13 onwards, starting from 1.13 they
+    // will be auto-discovered.
+    if (!Ember.Helper) {
+      registerHelper('key-in', keyIn);
+    }
+  }
+});
+
+test('boolean values', function(assert) {
+  var fakeContextObject = Ember.Object.create({
+    valueA: null
+  });
+  this.set('contextChild', fakeContextObject);
+  this.render(
+    Ember.HTMLBars.compile("[{{key-in 'valueA' contextChild}}] [{{key-in 'valueB' contextChild}}]")
+  );
+
+  assert.equal(this.$().text(), '[true] [false]', 'value should be "[true] [false]"');
+});