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| [[Angular]] | [[Firebase]] | [[TypeScript]] | [[Google Cloud Platform]] | [https://www.typea.info/blog/index.php/category/firebase/ ブログカテゴリ(Firebase)] | *https://firebase.google.com/docs/firestore?hl=ja ===データの並べ替え===*https://firebase.google.com/docs/firestore/query-data/order-limit-data?hl=ja==AngularFire==*https://github.com/angular/angularfire/blob/master/docs/firestore/querying-collections.md ===Document Fetch=== <pre>import { Observable } from 'rxjs';import { AngularFirestore, QuerySnapshot, DocumentSnapshot, DocumentData } from '@angular/fire/firestore'; export const FS_PATH_INFORMATIONS = 'informations/'; constructor( public firestore: AngularFirestore) { } public getInformations(): Observable<QuerySnapshot<DocumentData>> { const path = `${FS_PATH_INFORMATIONS}`; console.log(`get informations..[${path}]`); return this.firestore.collection<InformationCard>(path).get();}</pre> <pre> ngOnInit(): void { let outer = this; this.bookService.getInformations().subscribe({ next(p){ p.forEach(d => { outer.infoCards.push(d.data() as InformationCard); }); } }); }</pre> ===Document Query===Cloud <pre>/** FirestoreBookshelf Path */export const FS_PATH_BOOKSHELF = 'bookshelf/v1/users/'; public getBooksInBookshelfQuery(user: User, sortOrder?:SortOrder, lastBook?:Book): Promise<QuerySnapshot<DocumentData>> { if (user != null) { const pagelimit = 100; const path = `${FS_PATH_BOOKSHELF}${user.uid}/books`; console.log(`get book in bookshelf..[${path}] order:${sortOrder}`); console.log(`last book entity is.. ${lastBook}`); const collection = this.firestore.collection<Book>(path); let query = collection.ref.limit(pagelimit); if (sortOrder == 'nameAsc') { query = query.orderBy('title', 'asc'); if (lastBook) { console.log(`where title >= ${lastBook.title}`); query = query .where('title', '>=', lastBook.title) .orderBy('updatedAt', 'desc') .startAfter(lastBook.title, lastBook.updatedAt); } } else { query = query.orderBy('updatedAt', 'desc'); if (lastBook) { console.log(`where updatedAt <= ${lastBook.updatedAt}`); query = query .where('updatedAt', '<=', lastBook.updatedAt) .orderBy('title', 'asc') .startAfter(lastBook.updatedAt, lastBook.title); } } return query.get(); } }</pre> <pre> let outer = this; this.auth.onAuthStateChanged(async (u) => { const query = await this.bookService.getBooksInBookshelfQuery(u, sortOrder, lastBook).then(); query.forEach((doc) => { let book =<Book> doc.data(); book.documentId =doc.id; outer.books.push(book); }); });</pre>
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