The functionality of the DAO is to hide all the complexities involved in performing the database operations in the underlying persistence layer from the rest of the application.

inflate the layout

https://developer.android.com/codelabs/basic-android-kotlin-training-intro-room-flow#7

Override and implement onCreateViewHolder() and inflate the layout and set the onClickListener() to call onItemClicked() for the item at the current position.

That's it for

https://developer.android.com/codelabs/basic-android-kotlin-training-intro-room-flow#6

That's it for setting up your app's model.

acronym

Introduction to Room and Flow | Android Developers

While DAO is an acronym, naming conventions for Kotlin code only capitalize the first letter in acronyms, thus the name ScheduleDao and not ScheduleDAO.

come in handy

Introduction to Room and Flow | Android Developers

Your knowledge of SQL from the previous codelab will come in handy when defining the DAO.

stick

https://developer.android.com/codelabs/basic-android-kotlin-training-intro-room-flow#3

you'll stick with Kotlin date formatting functions.

Side by side

https://developer.android.com/studio/projects/install-ndk

Select the NDK (Side by side) and CMake checkboxes.

補足

https://en.wikipedia.org/wiki/Side-by-side_assembly

gracefully

https://developer.android.com/guide/webapps/managing-webview

The app can recover gracefully by creating a new WebView instance in the foreground.

anticipate

Get data from the internet | Android Developers

Inside the try block you perform the code where you anticipate an exception

take advantage of

https://developer.android.com/distribute

Take advantage of Google Play features to grow your startup

represent

https://developer.android.com/codelabs/kotlin-android-training-create-and-add-fragment?hl=ja#0

In this codelab, you learn about fragments, which represent a behavior or a portion of the user interface in an activity.

2021-07-21

node-apple-receipt-verify PurchasedProductsにoriginalTransactionIdがない

Adding in-app purchases to your Flutter app | Google Codelabs

import * as appleReceiptVerify from "node-apple-receipt-verify";

// Add typings for missing property in library interface.
declare module "node-apple-receipt-verify" {
  interface PurchasedProducts {
    originalTransactionId: string;
  }
}

回避策は上に書いてある通りです。Interfacesがマージできるという性質を利用してます。

また、PurchasedProductsにoriginalTransactionIdが無いというのは下記に無いということになります。

DefinitelyTyped/index.d.ts at 173aa9174685d78871a5c035b74d856f4aef9cc8 · DefinitelyTyped/DefinitelyTyped · GitHub

2021-07-20

tsconfigでよく問題になるオプション

随時追記

esModuleInterop

https://www.typescriptlang.org/tsconfig#esModuleInterop

Recommended: true
Default: false

falseの場合これで動く

import * as parse from 'csv-parse/lib/sync';

parse(input, {
      columns: true, // 一行目をフィールドのkeyとして使用する
      skip_empty_lines: true,
      cast: (value, context) => value === '' ? null : value
    });

trueならこっちに書き換えないといけない

import parse from 'csv-parse/lib/sync';

2021-07-19

flutter firestore_ref 3階層のコレクションをFactory constructorsで取得しやすくしてみる

/**
 * 親の親がorganizations,親がprojects
 */
class TeamsRef extends CollectionRef<Team, TeamDoc, TeamRef> {
  TeamsRef(this.cr) : super(cr);
  final CollectionReference<Map<String, dynamic>> cr;

  // 作ってみたもののあんまり意味がない
  factory TeamsRef.parentDoc(ProjectDoc doc) =>
      TeamsRef(doc.projectRef.ref.collection('teams'));

  // 呼び出し元が冗長
  factory TeamsRef.parentRef(ProjectRef parentRef) =>
      TeamsRef(parentRef.ref.collection('teams'));

  // 呼び出しもとは簡潔
  factory TeamsRef.ids(String grandParentId, String parentId) =>
      TeamsRef(FirebaseFirestore.instance
          .collection('organizations/$grandParentId/projects/$parentId/teams'));

  /* collectionGroupだと型が合わない
  factory TeamsRef.parentId(String parentId) =>
      TeamsRef(FirebaseFirestore.instance.collectionGroup(collectionPath));
  */

  @override
  JsonMap encode(Team data) => replacingTimestamp(json: data.toJson());

  @override
  TeamDoc decode(DocumentSnapshot<JsonMap> snapshot, TeamRef docRef) {
    return TeamDoc(
      docRef,
      Team.fromJson(snapshot.data()!),
    );
  }

  @override
  TeamRef docRef(DocumentReference<JsonMap> ref) => TeamRef(
        ref: ref,
        teamsRef: this,
      );
}