[FEATURE] Impl. buildRouteInfoMetadata

package.json

@@ -148,7 +148,7 @@
     "puppeteer": "^1.3.0",
     "qunit": "^2.8.0",
     "route-recognizer": "^0.3.4",
-    "router_js": "^6.1.3",
+    "router_js": "^6.2.0",
     "rsvp": "^4.8.4",
     "semver": "^5.5.0",
     "serve-static": "^1.13.2",

packages/@ember/-internals/routing/lib/system/route-info.ts

@@ -65,6 +65,14 @@
   @public
 */
 
+/**
+  Will contain the result `Route#buildRouteInfoMetadata`
+  for the corresponding Route.
+  @property {Any} metadata
+  @category ember-routing-build-routeinfo-metadata
+  @public
+*/
+
 /**
   A reference to the parent route's RouteInfo.
   This can be used to traverse upward to the topmost

packages/@ember/-internals/routing/lib/system/route.ts

@@ -7,7 +7,10 @@ import {
   Object as EmberObject,
   typeOf,
 } from '@ember/-internals/runtime';
-import { EMBER_ROUTING_ROUTER_SERVICE } from '@ember/canary-features';
+import {
+  EMBER_ROUTING_BUILD_ROUTEINFO_METADATA,
+  EMBER_ROUTING_ROUTER_SERVICE,
+} from '@ember/canary-features';
 import { assert, deprecate, info, isTesting } from '@ember/debug';
 import { ROUTER_EVENTS } from '@ember/deprecated-features';
 import { assign } from '@ember/polyfills';
@@ -2554,4 +2557,45 @@ if (EMBER_ROUTING_ROUTER_SERVICE && ROUTER_EVENTS) {
   });
 }
 
+if (EMBER_ROUTING_BUILD_ROUTEINFO_METADATA) {
+  Route.reopen({
+    /**
+      Allows you to produce custom metadata for the route.
+      The return value of this method will be attatched to
+      its corresponding RouteInfoWithAttributes obejct.
+
+      Example
+
+      ```app/routes/posts/index.js
+      import Route from '@ember/routing/route';
+
+      export default Route.extend({
+        buildRouteInfoMetadata() {
+          return { title: 'Posts Page' }
+        }
+      });
+      ```
+      ```app/routes/application.js
+      import Route from '@ember/routing/route';
+      import { inject as service } from '@ember/service';
+
+      export default Route.extend({
+        router: service('router'),
+        init() {
+          this._super(...arguments);
+          this.router.on('routeDidChange', transition => {
+            document.title = transition.to.metadata.title;
+            // would update document's title to "Posts Page"
+          });
+        }
+      });
+      ```
+
+      @return any
+      @category ember-routing-build-routeinfo-metadata
+     */
+    buildRouteInfoMetadata() {},
+  });
+}
+
 export default Route;

packages/@ember/canary-features/index.ts

@@ -24,6 +24,7 @@ export const DEFAULT_FEATURES = {
   EMBER_METAL_TRACKED_PROPERTIES: null,
   EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION: true,
   EMBER_GLIMMER_ARRAY_HELPER: null,
+  EMBER_ROUTING_BUILD_ROUTEINFO_METADATA: null,
 };
 
 /**
@@ -87,3 +88,7 @@ export const EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION = featureValue(
 );
 export const GLIMMER_MODIFIER_MANAGER = featureValue(FEATURES.GLIMMER_MODIFIER_MANAGER);
 export const EMBER_GLIMMER_ARRAY_HELPER = featureValue(FEATURES.EMBER_GLIMMER_ARRAY_HELPER);
+
+export const EMBER_ROUTING_BUILD_ROUTEINFO_METADATA = featureValue(
+  FEATURES.EMBER_ROUTING_BUILD_ROUTEINFO_METADATA
+);

packages/ember/tests/routing/router_service_test/build_routeinfo_metadata_test.js

@@ -0,0 +1,245 @@
+import {
+  EMBER_ROUTING_ROUTER_SERVICE,
+  EMBER_ROUTING_BUILD_ROUTEINFO_METADATA,
+} from '@ember/canary-features';
+import { RouterTestCase, moduleFor } from 'internal-test-helpers';
+import { inject as service } from '@ember/service';
+import { Route } from '@ember/-internals/routing';
+
+if (EMBER_ROUTING_BUILD_ROUTEINFO_METADATA && EMBER_ROUTING_ROUTER_SERVICE) {
+  moduleFor(
+    'buildRouteInfoMetadata',
+    class extends RouterTestCase {
+      '@test basic metadata'(assert) {
+        this.add(
+          `route:application`,
+          Route.extend({
+            router: service('router'),
+            init() {
+              this._super(...arguments);
+
+              this.router.on('routeDidChange', transition => {
+                assert.equal(transition.to.name, 'parent.index');
+                assert.equal(transition.to.metadata, 'parent-index-page');
+              });
+            },
+          })
+        );
+
+        this.add(
+          `route:parent.index`,
+          Route.extend({
+            buildRouteInfoMetadata() {
+              return 'parent-index-page';
+            },
+          })
+        );
+
+        return this.visit('/');
+      }
+
+      '@test hierarchical metadata'(assert) {
+        this.add(
+          `route:application`,
+          Route.extend({
+            router: service('router'),
+            buildRouteInfoMetadata() {
+              return 'application-shell';
+            },
+            init() {
+              this._super(...arguments);
+
+              this.router.on('routeDidChange', transition => {
+                assert.equal(transition.to.name, 'parent.index');
+                assert.equal(transition.to.metadata, 'parent-index-page');
+                assert.equal(transition.to.parent.name, 'parent');
+                assert.equal(transition.to.parent.metadata, 'parent-page');
+                assert.equal(transition.to.parent.parent.name, 'application');
+                assert.equal(transition.to.parent.parent.metadata, 'application-shell');
+              });
+            },
+          })
+        );
+
+        this.add(
+          `route:parent`,
+          Route.extend({
+            buildRouteInfoMetadata() {
+              return 'parent-page';
+            },
+          })
+        );
+
+        this.add(
+          `route:parent.index`,
+          Route.extend({
+            buildRouteInfoMetadata() {
+              return 'parent-index-page';
+            },
+          })
+        );
+
+        return this.visit('/');
+      }
+
+      '@test metadata can be complex objects'(assert) {
+        this.add(
+          `route:application`,
+          Route.extend({
+            router: service('router'),
+            init() {
+              this._super(...arguments);
+
+              this.router.on('routeDidChange', transition => {
+                assert.equal(transition.to.name, 'parent.index');
+                assert.equal(transition.to.metadata.name, 'parent-index-page');
+                assert.equal(transition.to.metadata.title('PARENT'), 'My Name is PARENT');
+              });
+            },
+          })
+        );
+
+        this.add(`route:parent`, Route.extend({}));
+
+        this.add(
+          `route:parent.index`,
+          Route.extend({
+            buildRouteInfoMetadata() {
+              return {
+                name: 'parent-index-page',
+                title: name => `My Name is ${name}`,
+              };
+            },
+          })
+        );
+
+        return this.visit('/');
+      }
+
+      '@test metadata is placed on the `from`'(assert) {
+        assert.expect(6);
+        this.add(
+          `route:application`,
+          Route.extend({
+            router: service('router'),
+            init() {
+              this._super(...arguments);
+
+              this.router.on('routeDidChange', transition => {
+                if (transition.to.name === 'parent.index') {
+                  assert.equal(transition.to.metadata.name, 'parent-index-page');
+                  assert.equal(transition.to.metadata.title('INDEX'), 'My Name is INDEX');
+                } else {
+                  assert.equal(transition.from.metadata.name, 'parent-index-page');
+                  assert.equal(transition.from.metadata.title('INDEX'), 'My Name is INDEX');
+                  assert.equal(transition.to.metadata.name, 'parent-child-page');
+                  assert.equal(transition.to.metadata.title('CHILD'), 'My Name is CHILD!!');
+                }
+              });
+            },
+          })
+        );
+
+        this.add(`route:parent`, Route.extend({}));
+
+        this.add(
+          `route:parent.index`,
+          Route.extend({
+            buildRouteInfoMetadata() {
+              return {
+                name: 'parent-index-page',
+                title: name => `My Name is ${name}`,
+              };
+            },
+          })
+        );
+
+        this.add(
+          `route:parent.child`,
+          Route.extend({
+            buildRouteInfoMetadata() {
+              return {
+                name: 'parent-child-page',
+                title: name => `My Name is ${name}!!`,
+              };
+            },
+          })
+        );
+
+        return this.visit('/').then(() => {
+          return this.visit('/child');
+        });
+      }
+
+      '@test can be used with model data from `attributes`'(assert) {
+        assert.expect(6);
+        this.add(
+          `route:application`,
+          Route.extend({
+            router: service('router'),
+            init() {
+              this._super(...arguments);
+
+              this.router.on('routeDidChange', transition => {
+                if (transition.to.name === 'parent.index') {
+                  assert.equal(transition.to.metadata.name, 'parent-index-page');
+                  assert.equal(
+                    transition.to.metadata.title(transition.to.attributes),
+                    'My Name is INDEX'
+                  );
+                } else {
+                  assert.equal(transition.from.metadata.name, 'parent-index-page');
+                  assert.equal(
+                    transition.from.metadata.title(transition.from.attributes),
+                    'My Name is INDEX'
+                  );
+                  assert.equal(transition.to.metadata.name, 'parent-child-page');
+                  assert.equal(
+                    transition.to.metadata.title(transition.to.attributes),
+                    'My Name is CHILD!!'
+                  );
+                }
+              });
+            },
+          })
+        );
+
+        this.add(`route:parent`, Route.extend({}));
+
+        this.add(
+          `route:parent.index`,
+          Route.extend({
+            model() {
+              return { name: 'INDEX' };
+            },
+            buildRouteInfoMetadata() {
+              return {
+                name: 'parent-index-page',
+                title: model => `My Name is ${model.name}`,
+              };
+            },
+          })
+        );
+
+        this.add(
+          `route:parent.child`,
+          Route.extend({
+            model() {
+              return { name: 'CHILD' };
+            },
+            buildRouteInfoMetadata() {
+              return {
+                name: 'parent-child-page',
+                title: model => `My Name is ${model.name}!!`,
+              };
+            },
+          })
+        );
+
+        return this.visit('/').then(() => {
+          return this.visit('/child');
+        });
+      }
+    }
+  );
+}

tests/docs/expected.js

@@ -347,6 +347,7 @@ module.exports = {
     'merge',
     'mergedProperties',
     'meta',
+    'metadata',
     'metaForProperty',
     'method',
     'min',

yarn.lock

@@ -7404,10 +7404,10 @@ route-recognizer@^0.3.4:
   resolved "https://registry.yarnpkg.com/route-recognizer/-/route-recognizer-0.3.4.tgz#39ab1ffbce1c59e6d2bdca416f0932611e4f3ca3"
   integrity sha512-2+MhsfPhvauN1O8KaXpXAOfR/fwe8dnUXVM+xw7yt40lJRfPVQxV6yryZm0cgRvAj5fMF/mdRZbL2ptwbs5i2g==
 
-router_js@^6.1.3:
-  version "6.1.3"
-  resolved "https://registry.yarnpkg.com/router_js/-/router_js-6.1.3.tgz#9fbecbb4b173f5a6c4580d15f94737cfeb4629e6"
-  integrity sha512-I3l/4wMpSl/Fd9SZQCa7kVAIn5H3v10KjA4CuJPg1gjihC5GKFi4owetf/psNg2lAqevmMn81yLCsIxBwoeK1A==
+router_js@^6.2.0:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/router_js/-/router_js-6.2.0.tgz#df2eac625169997f03d7cdf67507bda49d98be3a"
+  integrity sha512-K57PWU58OiXlaGzHw1vXg0PeC8NpMRIsd3poXq0qXZRIzB3OtMJQolHUuJ0c88544gv+tKw1kaYYM/0E1XNmng==
   dependencies:
     "@types/node" "^10.5.5"