add support for Ember Bootstrap <= 4.4

Author: jelhan

.github/workflows/ci.yml

@@ -62,6 +62,7 @@ jobs:
           - ember-canary
           - ember-default-with-jquery
           - ember-classic
+          - ember-bootstrap-4.4
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

addon/components/bs-form/element.js

@@ -1,5 +1,5 @@
 import { not, notEmpty, and, readOnly } from '@ember/object/computed';
-import { defineProperty } from '@ember/object';
+import { defineProperty, get } from '@ember/object';
 import BsFormElement from 'ember-bootstrap/components/bs-form/element';
 
 export default class ValidatedBsFormElement extends BsFormElement {
@@ -25,6 +25,10 @@ export default class ValidatedBsFormElement extends BsFormElement {
   warnings;
 
   setupValidations() {
-    defineProperty(this, '_attrValidations', readOnly(`args.model.validations.attrs.${this.args.property}`));
+    if (typeof this.args === 'object') {
+      defineProperty(this, '_attrValidations', readOnly(`args.model.validations.attrs.${this.args.property}`));
+    } else {
+      defineProperty(this, '_attrValidations', readOnly(`model.validations.attrs.${this.property}`));
+    }
   }
 }

config/ember-try.js

@@ -73,7 +73,15 @@ module.exports = async function() {
             edition: 'classic'
           }
         }
-      }
+      },
+      {
+        name: 'ember-bootstrap-4.4',
+        npm: {
+          devDependencies: {
+            'ember-bootstrap': '~4.4.0'
+          }
+        }
+      },
     ]
   };
 };