@angular/fire
Version:
The official Angular library for Firebase.
117 lines • 17 kB
JavaScript
import { from } from 'rxjs';
import { filter, map, pairwise, scan, startWith } from 'rxjs/operators';
import { keepUnstableUntilFirst } from '@angular/fire';
import { docChanges, sortedChanges } from './changes';
import { AngularFirestoreDocument } from '../document/document';
import { fromCollectionRef } from '../observable/fromRef';
export function validateEventsArray(events) {
if (!events || events.length === 0) {
events = ['added', 'removed', 'modified'];
}
return events;
}
/**
* AngularFirestoreCollection service
*
* This class creates a reference to a Firestore Collection. A reference and a query are provided in
* in the constructor. The query can be the unqueried reference if no query is desired.The class
* is generic which gives you type safety for data update methods and data streaming.
*
* This class uses Symbol.observable to transform into Observable using Observable.from().
*
* This class is rarely used directly and should be created from the AngularFirestore service.
*
* Example:
*
* const collectionRef = firebase.firestore.collection('stocks');
* const query = collectionRef.where('price', '>', '0.01');
* const fakeStock = new AngularFirestoreCollection<Stock>(collectionRef, query);
*
* // NOTE!: the updates are performed on the reference not the query
* await fakeStock.add({ name: 'FAKE', price: 0.01 });
*
* // Subscribe to changes as snapshots. This provides you data updates as well as delta updates.
* fakeStock.valueChanges().subscribe(value => console.log(value));
*/
export class AngularFirestoreCollection {
/**
* The constructor takes in a CollectionReference and Query to provide wrapper methods
* for data operations and data streaming.
*
* Note: Data operation methods are done on the reference not the query. This means
* when you update data it is not updating data to the window of your query unless
* the data fits the criteria of the query. See the AssociatedRefence type for details
* on this implication.
*/
constructor(ref, query, afs) {
this.ref = ref;
this.query = query;
this.afs = afs;
}
/**
* Listen to the latest change in the stream. This method returns changes
* as they occur and they are not sorted by query order. This allows you to construct
* your own data structure.
*/
stateChanges(events) {
let source = docChanges(this.query, this.afs.schedulers.outsideAngular);
if (events && events.length > 0) {
source = source.pipe(map(actions => actions.filter(change => events.indexOf(change.type) > -1)));
}
return source.pipe(
// We want to filter out empty arrays, but always emit at first, so the developer knows
// that the collection has been resolve; even if it's empty
startWith(undefined), pairwise(), filter(([prior, current]) => current.length > 0 || !prior), map(([prior, current]) => current), keepUnstableUntilFirst);
}
/**
* Create a stream of changes as they occur it time. This method is similar to stateChanges()
* but it collects each event in an array over time.
*/
auditTrail(events) {
return this.stateChanges(events).pipe(scan((current, action) => [...current, ...action], []));
}
/**
* Create a stream of synchronized changes. This method keeps the local array in sorted
* query order.
*/
snapshotChanges(events) {
const validatedEvents = validateEventsArray(events);
const scheduledSortedChanges$ = sortedChanges(this.query, validatedEvents, this.afs.schedulers.outsideAngular);
return scheduledSortedChanges$.pipe(keepUnstableUntilFirst);
}
valueChanges(options = {}) {
return fromCollectionRef(this.query, this.afs.schedulers.outsideAngular)
.pipe(map(actions => actions.payload.docs.map(a => {
if (options.idField) {
return Object.assign(Object.assign({}, a.data()), { [options.idField]: a.id });
}
else {
return a.data();
}
})), keepUnstableUntilFirst);
}
/**
* Retrieve the results of the query once.
*/
get(options) {
return from(this.query.get(options)).pipe(keepUnstableUntilFirst);
}
/**
* Add data to a collection reference.
*
* Note: Data operation methods are done on the reference not the query. This means
* when you update data it is not updating data to the window of your query unless
* the data fits the criteria of the query.
*/
add(data) {
return this.ref.add(data);
}
/**
* Create a reference to a single document in a collection.
*/
doc(path) {
// TODO is there a better way to solve this type issue
return new AngularFirestoreDocument(this.ref.doc(path), this.afs);
}
}
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A reference and a query are provided in\n * in the constructor. The query can be the unqueried reference if no query is desired.The class\n * is generic which gives you type safety for data update methods and data streaming.\n *\n * This class uses Symbol.observable to transform into Observable using Observable.from().\n *\n * This class is rarely used directly and should be created from the AngularFirestore service.\n *\n * Example:\n *\n * const collectionRef = firebase.firestore.collection('stocks');\n * const query = collectionRef.where('price', '>', '0.01');\n * const fakeStock = new AngularFirestoreCollection<Stock>(collectionRef, query);\n *\n * // NOTE!: the updates are performed on the reference not the query\n * await fakeStock.add({ name: 'FAKE', price: 0.01 });\n *\n * // Subscribe to changes as snapshots. This provides you data updates as well as delta updates.\n * fakeStock.valueChanges().subscribe(value => console.log(value));\n */\nexport class AngularFirestoreCollection<T = DocumentData> {\n  /**\n   * The constructor takes in a CollectionReference and Query to provide wrapper methods\n   * for data operations and data streaming.\n   *\n   * Note: Data operation methods are done on the reference not the query. This means\n   * when you update data it is not updating data to the window of your query unless\n   * the data fits the criteria of the query. See the AssociatedRefence type for details\n   * on this implication.\n   */\n  constructor(\n    public readonly ref: CollectionReference<T>,\n    private readonly query: Query<T>,\n    private readonly afs: AngularFirestore) { }\n\n  /**\n   * Listen to the latest change in the stream. This method returns changes\n   * as they occur and they are not sorted by query order. This allows you to construct\n   * your own data structure.\n   */\n  stateChanges(events?: DocumentChangeType[]): Observable<DocumentChangeAction<T>[]> {\n    let source = docChanges<T>(this.query, this.afs.schedulers.outsideAngular);\n    if (events && events.length > 0) {\n      source = source.pipe(\n        map(actions => actions.filter(change => events.indexOf(change.type) > -1))\n      );\n    }\n    return source.pipe(\n      // We want to filter out empty arrays, but always emit at first, so the developer knows\n      // that the collection has been resolve; even if it's empty\n      startWith<DocumentChangeAction<T>[], undefined>(undefined),\n      pairwise(),\n      filter(([prior, current]) => current.length > 0 || !prior),\n      map(([prior, current]) => current),\n      keepUnstableUntilFirst\n    );\n  }\n\n  /**\n   * Create a stream of changes as they occur it time. This method is similar to stateChanges()\n   * but it collects each event in an array over time.\n   */\n  auditTrail(events?: DocumentChangeType[]): Observable<DocumentChangeAction<T>[]> {\n    return this.stateChanges(events).pipe(scan((current, action) => [...current, ...action], []));\n  }\n\n  /**\n   * Create a stream of synchronized changes. This method keeps the local array in sorted\n   * query order.\n   */\n  snapshotChanges(events?: DocumentChangeType[]): Observable<DocumentChangeAction<T>[]> {\n    const validatedEvents = validateEventsArray(events);\n    const scheduledSortedChanges$ = sortedChanges<T>(this.query, validatedEvents, this.afs.schedulers.outsideAngular);\n    return scheduledSortedChanges$.pipe(\n      keepUnstableUntilFirst\n    );\n  }\n\n  /**\n   * Listen to all documents in the collection and its possible query as an Observable.\n   *\n   * If the `idField` option is provided, document IDs are included and mapped to the\n   * provided `idField` property name.\n   */\n  valueChanges(): Observable<T[]>;\n  // tslint:disable-next-line:unified-signatures\n  valueChanges({}): Observable<T[]>;\n  valueChanges<K extends string>(options: {idField: K}): Observable<(T & { [T in K]: string })[]>;\n  valueChanges<K extends string>(options: {idField?: K} = {}): Observable<T[]> {\n    return fromCollectionRef<T>(this.query, this.afs.schedulers.outsideAngular)\n      .pipe(\n        map(actions => actions.payload.docs.map(a => {\n          if (options.idField) {\n            return {\n              ...a.data() as {},\n              ...{ [options.idField]: a.id }\n            } as T & { [T in K]: string };\n          } else {\n            return a.data();\n          }\n        })),\n        keepUnstableUntilFirst\n      );\n  }\n\n  /**\n   * Retrieve the results of the query once.\n   */\n  get(options?: firebase.firestore.GetOptions) {\n    return from(this.query.get(options)).pipe(\n      keepUnstableUntilFirst,\n    );\n  }\n\n  /**\n   * Add data to a collection reference.\n   *\n   * Note: Data operation methods are done on the reference not the query. This means\n   * when you update data it is not updating data to the window of your query unless\n   * the data fits the criteria of the query.\n   */\n  add(data: T): Promise<DocumentReference<T>> {\n    return this.ref.add(data);\n  }\n\n  /**\n   * Create a reference to a single document in a collection.\n   */\n  doc<T2 = T>(path?: string): AngularFirestoreDocument<T2> {\n    // TODO is there a better way to solve this type issue\n    return new AngularFirestoreDocument(this.ref.doc(path) as any, this.afs);\n  }\n}\n"]}