Gracefully handle the 501 case

Enterprise endpoints return a 501 in the open source build. 5xx
errors throw by default, so handle this one since it's expected
for things such as namespaces.

ui/app/adapters/application.js

@@ -19,6 +19,18 @@ export default RESTAdapter.extend({
     );
   }),
 
+  findAll() {
+    return this._super(...arguments).catch(error => {
+      if (error.code === '501' || (error.errors && error.errors.findBy('status', '501'))) {
+        // Feature is not implemented in this version of Nomad
+        return [];
+      }
+
+      // Rethrow to be handled downstream
+      throw error;
+    });
+  },
+
   // Single record requests deviate from REST practice by using
   // the singular form of the resource name.
   //

ui/app/templates/jobs/job/index.hbs

@@ -19,9 +19,9 @@
     <div class="boxed-section job-stats">
       <div class="boxed-section-body">
         <span><strong>Type:</strong> {{model.type}} | </span>
-        <span><strong>Priority:</strong> {{model.priority}} | </span>
+        <span><strong>Priority:</strong> {{model.priority}} </span>
         {{#if model.namespace}}
-          <span><strong>Namespace:</strong> {{model.namespace.name}}</span>
+          <span> | <strong>Namespace:</strong> {{model.namespace.name}}</span>
         {{/if}}
       </div>
     </div>

ui/mirage/config.js

@@ -1,4 +1,5 @@
 import Ember from 'ember';
+import Response from 'ember-cli-mirage/response';
 import { HOSTS } from './common';
 
 const { copy } = Ember;
@@ -60,8 +61,23 @@ export default function() {
 
   this.get('/allocation/:id');
 
-  this.get('/namespaces');
-  this.get('/namespace/:id');
+  this.get('/namespaces', function({ namespaces }) {
+    const records = namespaces.all();
+
+    if (records.length) {
+      return this.serialize(records);
+    }
+
+    return new Response(501, {}, null);
+  });
+
+  this.get('/namespace/:id', function({ namespaces }, { params }) {
+    if (namespaces.all().length) {
+      return this.serialize(namespaces.find(params.id));
+    }
+
+    return new Response(501, {}, null);
+  });
 
   this.get('/agent/members', function({ agents }) {
     return {

ui/mirage/factories/job.js

@@ -50,7 +50,7 @@ export default Factory.extend({
     job.update({
       taskGroupIds: groups.mapBy('id'),
       task_group_ids: groups.mapBy('id'),
-      namespaceId: server.db.namespaces.length && pickOne(server.db.namespaces).id,
+      namespaceId: server.db.namespaces.length ? pickOne(server.db.namespaces).id : null,
     });
 
     const jobSummary = server.create('job-summary', {

ui/mirage/factories/namespace.js

@@ -1,10 +1,12 @@
 import { Factory, faker } from 'ember-cli-mirage';
 
 export default Factory.extend({
-  id: i => `namespace-${i}`,
+  id: i => (i === 0 ? 'default' : `namespace-${i}`),
+
   name() {
     return this.id;
   },
+
   hash: () => faker.random.uuid(),
   description: '',
 });

ui/mirage/scenarios/default.js

@@ -2,7 +2,6 @@ export default function(server) {
   server.createList('agent', 3);
   server.createList('node', 50);
 
-  server.create('namespace', { id: 'default' });
   server.createList('namespace', 3);
 
   server.createList('job', 15);