68930: add embed query param for followLinks in buildHref + tests

removed fdescribe

.java-version

@@ -0,0 +1 @@
+1.8

src/app/core/cache/builders/link.service.spec.ts

@@ -90,7 +90,7 @@ describe('LinkService', () => {
           propertyName: 'predecessor'
         });
         spyOnFunction(decorators, 'getDataServiceFor').and.returnValue(TestDataService);
-        service.resolveLink(testModel, followLink('predecessor', {}, followLink('successor')))
+        service.resolveLink(testModel, followLink('predecessor', {}, true, followLink('successor')))
       });
       it('should call dataservice.findByHref with the correct href and nested links', () => {
         expect(testDataService.findByHref).toHaveBeenCalledWith(testModel._links.predecessor.href, followLink('successor'));
@@ -105,7 +105,7 @@ describe('LinkService', () => {
           isList: true
         });
         spyOnFunction(decorators, 'getDataServiceFor').and.returnValue(TestDataService);
-        service.resolveLink(testModel, followLink('predecessor', { some: 'options '} as any, followLink('successor')))
+        service.resolveLink(testModel, followLink('predecessor', { some: 'options '} as any, true, followLink('successor')))
       });
       it('should call dataservice.findAllByHref with the correct href, findListOptions,  and nested links', () => {
         expect(testDataService.findAllByHref).toHaveBeenCalledWith(testModel._links.predecessor.href, { some: 'options '} as any, followLink('successor'));
@@ -119,7 +119,7 @@ describe('LinkService', () => {
           propertyName: 'predecessor'
         });
         spyOnFunction(decorators, 'getDataServiceFor').and.returnValue(TestDataService);
-        result = service.resolveLink(testModel, followLink('predecessor', {}, followLink('successor')))
+        result = service.resolveLink(testModel, followLink('predecessor', {}, true, followLink('successor')))
       });
 
       it('should call getLinkDefinition with the correct model and link', () => {
@@ -144,7 +144,7 @@ describe('LinkService', () => {
       });
       it('should throw an error', () => {
         expect(() => {
-          service.resolveLink(testModel, followLink('predecessor', {}, followLink('successor')))
+          service.resolveLink(testModel, followLink('predecessor', {}, true, followLink('successor')))
         }).toThrow();
       });
     });
@@ -160,7 +160,7 @@ describe('LinkService', () => {
       });
       it('should throw an error', () => {
         expect(() => {
-          service.resolveLink(testModel, followLink('predecessor', {}, followLink('successor')))
+          service.resolveLink(testModel, followLink('predecessor', {}, true, followLink('successor')))
         }).toThrow();
       });
     });

src/app/core/data/data.service.spec.ts

@@ -1,21 +1,23 @@
-import { DataService } from './data.service';
+import { HttpClient } from '@angular/common/http';
-import { RequestService } from './request.service';
-import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { CoreState } from '../core.reducers';
 import { Store } from '@ngrx/store';
-import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { compare, Operation } from 'fast-json-patch';
 import { Observable, of as observableOf } from 'rxjs';
-import { FindListOptions } from './request.models';
+import * as uuidv4 from 'uuid/v4';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { SortDirection, SortOptions } from '../cache/models/sort-options.model';
 import { ObjectCacheService } from '../cache/object-cache.service';
-import { compare, Operation } from 'fast-json-patch';
+import { CoreState } from '../core.reducers';
+import { Collection } from '../shared/collection.model';
 import { DSpaceObject } from '../shared/dspace-object.model';
-import { ChangeAnalyzer } from './change-analyzer';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { HttpClient } from '@angular/common/http';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
 import { Item } from '../shared/item.model';
-import * as uuidv4 from 'uuid/v4';
+import { ChangeAnalyzer } from './change-analyzer';
-import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { DataService } from './data.service';
+import { FindListOptions } from './request.models';
+import { RequestService } from './request.service';
 
 const endpoint = 'https://rest.api/core';
 
@@ -40,6 +42,7 @@ class TestService extends DataService<any> {
     return observableOf(endpoint);
   }
 }
+
 class DummyChangeAnalyzer implements ChangeAnalyzer<Item> {
   diff(object1: Item, object2: Item): Operation[] {
     return compare((object1 as any).metadata, (object2 as any).metadata);
@@ -50,7 +53,7 @@ class DummyChangeAnalyzer implements ChangeAnalyzer<Item> {
 describe('DataService', () => {
   let service: TestService;
   let options: FindListOptions;
-  const requestService = {generateRequestId: () => uuidv4()} as RequestService;
+  const requestService = { generateRequestId: () => uuidv4() } as RequestService;
   const halService = {} as HALEndpointService;
   const rdbService = {} as RemoteDataBuildService;
   const notificationsService = {} as NotificationsService;
@@ -144,7 +147,73 @@ describe('DataService', () => {
       (service as any).getFindAllHref(options).subscribe((value) => {
         expect(value).toBe(expected);
       });
-    })
+    });
+
+    it('should include single linksToFollow as embed', () => {
+      const mockFollowLinkConfig: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'bundles' as any,
+      });
+      const expected = `${endpoint}?embed=bundles`;
+
+      (service as any).getFindAllHref({}, null, mockFollowLinkConfig).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include multiple linksToFollow as embed', () => {
+      const mockFollowLinkConfig: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'bundles' as any,
+      });
+      const mockFollowLinkConfig2: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'owningCollection' as any,
+      });
+      const mockFollowLinkConfig3: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'templateItemOf' as any,
+      });
+      const expected = `${endpoint}?embed=bundles&embed=owningCollection&embed=templateItemOf`;
+
+      (service as any).getFindAllHref({}, null, mockFollowLinkConfig, mockFollowLinkConfig2, mockFollowLinkConfig3).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should not include linksToFollow with forwardToRest = false', () => {
+      const mockFollowLinkConfig: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'bundles' as any,
+        forwardToRest: false,
+      });
+      const mockFollowLinkConfig2: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'owningCollection' as any,
+        forwardToRest: false,
+      });
+      const mockFollowLinkConfig3: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'templateItemOf' as any,
+      });
+      const expected = `${endpoint}?embed=templateItemOf`;
+
+      (service as any).getFindAllHref({}, null, mockFollowLinkConfig, mockFollowLinkConfig2, mockFollowLinkConfig3).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include nested linksToFollow 3lvl', () => {
+      const mockFollowLinkConfig3: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'relationships' as any,
+      });
+      const mockFollowLinkConfig2: FollowLinkConfig<Collection> = Object.assign(new FollowLinkConfig(), {
+        name: 'itemtemplate' as any,
+        linksToFollow: mockFollowLinkConfig3,
+      });
+      const mockFollowLinkConfig: FollowLinkConfig<Item> = Object.assign(new FollowLinkConfig(), {
+        name: 'owningCollection' as any,
+        linksToFollow: mockFollowLinkConfig2,
+      });
+      const expected = `${endpoint}?embed=owningCollection/itemtemplate/relationships`;
+
+      (service as any).getFindAllHref({}, null, mockFollowLinkConfig).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
   });
   describe('patch', () => {
     let operations;

src/app/core/data/data.service.ts

@@ -83,14 +83,15 @@ export abstract class DataService<T extends CacheableObject> {
    * @param linkPath The link path for the object
    * @return {Observable<string>}
    *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
    */
-  protected getFindAllHref(options: FindListOptions = {}, linkPath?: string): Observable<string> {
+  protected getFindAllHref(options: FindListOptions = {}, linkPath?: string, ...linksToFollow: Array<FollowLinkConfig<T>>): Observable<string> {
     let result$: Observable<string>;
     const args = [];
 
     result$ = this.getBrowseEndpoint(options, linkPath).pipe(distinctUntilChanged());
 
-    return result$.pipe(map((result: string) => this.buildHrefFromFindOptions(result, options, args)));
+    return result$.pipe(map((result: string) => this.buildHrefFromFindOptions(result, options, args, ...linksToFollow)));
   }
 
   /**
@@ -100,8 +101,9 @@ export abstract class DataService<T extends CacheableObject> {
    * @param options The [[FindListOptions]] object
    * @return {Observable<string>}
    *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
    */
-  protected getSearchByHref(searchMethod: string, options: FindListOptions = {}): Observable<string> {
+  protected getSearchByHref(searchMethod: string, options: FindListOptions = {}, ...linksToFollow: Array<FollowLinkConfig<T>>): Observable<string> {
     let result$: Observable<string>;
     const args = [];
 
@@ -113,7 +115,7 @@ export abstract class DataService<T extends CacheableObject> {
       })
     }
 
-    return result$.pipe(map((result: string) => this.buildHrefFromFindOptions(result, options, args)));
+    return result$.pipe(map((result: string) => this.buildHrefFromFindOptions(result, options, args, ...linksToFollow)));
   }
 
   /**
@@ -124,8 +126,9 @@ export abstract class DataService<T extends CacheableObject> {
    * @param extraArgs Array with additional params to combine with query string
    * @return {Observable<string>}
    *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
    */
-  protected buildHrefFromFindOptions(href: string, options: FindListOptions, extraArgs: string[] = []): string {
+  protected buildHrefFromFindOptions(href: string, options: FindListOptions, extraArgs: string[] = [], ...linksToFollow: Array<FollowLinkConfig<T>>): string {
 
     let args = [...extraArgs];
 
@@ -142,6 +145,7 @@ export abstract class DataService<T extends CacheableObject> {
     if (hasValue(options.startsWith)) {
       args = [...args, `startsWith=${options.startsWith}`];
     }
+    args = this.addEmbedParams(args, linksToFollow);
     if (isNotEmpty(args)) {
       return new URLCombiner(href, `?${args.join('&')}`).toString();
     } else {
@@ -149,6 +153,45 @@ export abstract class DataService<T extends CacheableObject> {
     }
   }
 
+  /**
+   * Adds the embed options to the link for the request
+   * @param args            params for the query string
+   * @param linksToFollow   links we want to embed in query string if forwardToRest is true
+   */
+  protected addEmbedParams(args: any, linksToFollow: Array<FollowLinkConfig<T>>) {
+    if (linksToFollow !== undefined) {
+      linksToFollow.forEach((linkToFollow: FollowLinkConfig<T>) => {
+        console.log('linksToFollow', linksToFollow)
+        if (linkToFollow.forwardToRest) {
+          const embedString = 'embed=' + String(linkToFollow.name);
+          const embedWithNestedString = this.addNestedEmbeds(embedString, linkToFollow.linksToFollow);
+          args = [...args, embedWithNestedString];
+        }
+      });
+    }
+    return args;
+  }
+
+  /**
+   * Add the nested followLinks to the embed param, recursively, separated by a /
+   * @param embedString
+   * @param linksToFollow
+   */
+  protected addNestedEmbeds(embedString: string, linksToFollow: Array<FollowLinkConfig<T>>): string {
+    let nestEmbed = embedString;
+    if (linksToFollow !== undefined) {
+      linksToFollow.forEach((linkToFollow: FollowLinkConfig<T>) => {
+        if (linkToFollow.forwardToRest) {
+          nestEmbed = nestEmbed + '/' + String(linkToFollow.name);
+          if (linkToFollow.linksToFollow !== undefined) {
+            nestEmbed = this.addNestedEmbeds(nestEmbed, linkToFollow.linksToFollow);
+          }
+        }
+      })
+    }
+    return nestEmbed;
+  }
+
   /**
    * Returns {@link RemoteData} of all object with a list of {@link FollowLinkConfig}, to indicate which embedded
    * info should be added to the objects
@@ -223,7 +266,7 @@ export abstract class DataService<T extends CacheableObject> {
    * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
    */
   findByHref(href: string, ...linksToFollow: Array<FollowLinkConfig<T>>): Observable<RemoteData<T>> {
-    const requestHref = this.buildHrefFromFindOptions(href, {}, []);
+    const requestHref = this.buildHrefFromFindOptions(href, {}, [], ...linksToFollow);
     const request = new GetRequest(this.requestService.generateRequestId(), requestHref);
     if (hasValue(this.responseMsToLive)) {
       request.responseMsToLive = this.responseMsToLive;
@@ -240,7 +283,7 @@ export abstract class DataService<T extends CacheableObject> {
    * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
    */
   findAllByHref(href: string, findListOptions: FindListOptions = {}, ...linksToFollow: Array<FollowLinkConfig<T>>): Observable<RemoteData<PaginatedList<T>>> {
-    const requestHref = this.buildHrefFromFindOptions(href, findListOptions, []);
+    const requestHref = this.buildHrefFromFindOptions(href, findListOptions, [], ...linksToFollow);
     const request = new GetRequest(this.requestService.generateRequestId(), requestHref);
     if (hasValue(this.responseMsToLive)) {
       request.responseMsToLive = this.responseMsToLive;
@@ -271,7 +314,7 @@ export abstract class DataService<T extends CacheableObject> {
    */
   protected searchBy(searchMethod: string, options: FindListOptions = {}, ...linksToFollow: Array<FollowLinkConfig<T>>): Observable<RemoteData<PaginatedList<T>>> {
 
-    const hrefObs = this.getSearchByHref(searchMethod, options);
+    const hrefObs = this.getSearchByHref(searchMethod, options, ...linksToFollow);
 
     return hrefObs.pipe(
       find((href: string) => hasValue(href)),

src/app/shared/utils/follow-link-config.model.ts

@@ -23,6 +23,11 @@ export class FollowLinkConfig<R extends HALResource> {
    * use on the retrieved object.
    */
   linksToFollow?: Array<FollowLinkConfig<any>>;
+
+  /**
+   * Forward to rest which links we're following, so these can already be embedded
+   */
+  forwardToRest? = true;
 }
 
 /**
@@ -36,15 +41,19 @@ export class FollowLinkConfig<R extends HALResource> {
  * in a certain way
  * @param linksToFollow: a list of {@link FollowLinkConfig}s to
  * use on the retrieved object.
+ * @param forwardToRest: boolean to check whether to forward info on followLinks to rest,
+ * so these can be embedded, default true
  */
 export const followLink = <R extends HALResource>(
   linkName: keyof R['_links'],
   findListOptions?: FindListOptions,
+  forwardToRest = true,
   ...linksToFollow: Array<FollowLinkConfig<any>>
 ): FollowLinkConfig<R> => {
   return {
     name: linkName,
     findListOptions,
+    forwardToRest,
     linksToFollow
   }
 };