feat(core): add sugar to use ContentChildren and ViewChildren as prop decorators

Closes #4237

modules/angular2/src/core/compiler/directive_resolver.ts

@@ -8,7 +8,9 @@ import {
   PropertyMetadata,
   EventMetadata,
   HostBindingMetadata,
-  HostListenerMetadata
+  HostListenerMetadata,
+  ContentChildrenMetadata,
+  ViewChildrenMetadata
 } from 'angular2/src/core/metadata';
 import {reflector} from 'angular2/src/core/reflection/reflection';
 
@@ -44,6 +46,7 @@ export class DirectiveResolver {
     var properties = [];
     var events = [];
     var host = {};
+    var queries = {};
 
     StringMapWrapper.forEach(propertyMetadata, (metadata: any[], propName: string) => {
       metadata.forEach(a => {
@@ -75,17 +78,28 @@ export class DirectiveResolver {
           var args = isPresent(a.args) ? a.args.join(', ') : '';
           host[`(${a.eventName})`] = `${propName}(${args})`;
         }
+
+        if (a instanceof ContentChildrenMetadata) {
+          queries[propName] = a;
+        }
+
+        if (a instanceof ViewChildrenMetadata) {
+          queries[propName] = a;
+        }
       });
     });
-    return this._merge(dm, properties, events, host);
+    return this._merge(dm, properties, events, host, queries);
   }
 
   private _merge(dm: DirectiveMetadata, properties: string[], events: string[],
-                 host: StringMap<string, string>): DirectiveMetadata {
+                 host: StringMap<string, string>,
+                 queries: StringMap<string, any>): DirectiveMetadata {
     var mergedProperties =
         isPresent(dm.properties) ? ListWrapper.concat(dm.properties, properties) : properties;
     var mergedEvents = isPresent(dm.events) ? ListWrapper.concat(dm.events, events) : events;
     var mergedHost = isPresent(dm.host) ? StringMapWrapper.merge(dm.host, host) : host;
+    var mergedQueries =
+        isPresent(dm.queries) ? StringMapWrapper.merge(dm.queries, queries) : queries;
 
     if (dm instanceof ComponentMetadata) {
       return new ComponentMetadata({
@@ -98,6 +112,7 @@ export class DirectiveResolver {
         exportAs: dm.exportAs,
         moduleId: dm.moduleId,
         compileChildren: dm.compileChildren,
+        queries: mergedQueries,
         changeDetection: dm.changeDetection,
         viewBindings: dm.viewBindings
       });
@@ -111,7 +126,8 @@ export class DirectiveResolver {
         bindings: dm.bindings,
         exportAs: dm.exportAs,
         moduleId: dm.moduleId,
-        compileChildren: dm.compileChildren
+        compileChildren: dm.compileChildren,
+        queries: mergedQueries
       });
     }
   }

modules/angular2/test/core/compiler/directive_resolver_spec.ts

@@ -6,7 +6,11 @@ import {
   Property,
   Event,
   HostBinding,
-  HostListener
+  HostListener,
+  ContentChildren,
+  ContentChildrenMetadata,
+  ViewChildren,
+  ViewChildrenMetadata
 } from 'angular2/src/core/metadata';
 
 @Directive({selector: 'someDirective'})
@@ -64,6 +68,17 @@ class SomeDirectiveWithHostListeners {
   }
 }
 
+@Directive({selector: 'someDirective', queries: {"cs": new ContentChildren("c")}})
+class SomeDirectiveWithContentChildren {
+  @ContentChildren("a") as: any;
+  c;
+}
+
+@Directive({selector: 'someDirective', queries: {"cs": new ViewChildren("c")}})
+class SomeDirectiveWithViewChildren {
+  @ViewChildren("a") as: any;
+  c;
+}
 
 class SomeDirectiveWithoutMetadata {}
 
@@ -77,7 +92,7 @@ export function main() {
       var directiveMetadata = resolver.resolve(SomeDirective);
       expect(directiveMetadata)
           .toEqual(new DirectiveMetadata(
-              {selector: 'someDirective', properties: [], events: [], host: {}}));
+              {selector: 'someDirective', properties: [], events: [], host: {}, queries: {}}));
     });
 
     it('should throw if not matching metadata is found', () => {
@@ -89,7 +104,7 @@ export function main() {
       var directiveMetadata = resolver.resolve(SomeChildDirective);
       expect(directiveMetadata)
           .toEqual(new DirectiveMetadata(
-              {selector: 'someChildDirective', properties: [], events: [], host: {}}));
+              {selector: 'someChildDirective', properties: [], events: [], host: {}, queries: {}}));
     });
 
     describe('properties', () => {
@@ -128,5 +143,19 @@ export function main() {
             .toEqual({'(c)': 'onC()', '(a)': 'onA()', '(b)': 'onB($event.value)'});
       });
     });
+
+    describe('queries', () => {
+      it('should append ContentChildren', () => {
+        var directiveMetadata = resolver.resolve(SomeDirectiveWithContentChildren);
+        expect(directiveMetadata.queries)
+            .toEqual({"cs": new ContentChildren("c"), "as": new ContentChildren("a")});
+      });
+
+      it('should append ViewChildren', () => {
+        var directiveMetadata = resolver.resolve(SomeDirectiveWithViewChildren);
+        expect(directiveMetadata.queries)
+            .toEqual({"cs": new ViewChildren("c"), "as": new ViewChildren("a")});
+      });
+    });
   });
 }