Roughing in ember-can: placeholders for strain mod

app/abilities/strain.js

@@ -0,0 +1,17 @@
+import { Ability } from 'ember-can';
+
+export default Ability.extend({
+  // Only admins and writers can create a new strain
+  canAdd: function() {
+    let role = this.get('session.currentUser.role');
+    return (role === 'W') || (role === 'A');
+  }.property('session.currentUser.role'),
+
+  // Only admins and the person who created can edit
+  canEdit: function() {
+    let role = this.get('session.currentUser.role');
+    let id = this.get('session.currentUser.id');
+    let author = this.get('model.author');
+    return (role === 'W' && (+id === author)) || (role === 'A');
+  }.property('session.currentUser.role', 'session.currentUser.id', 'model.author')
+});