January 2021
Intermediate to advanced
272 pages
4h 10m
Japanese
book
SolidityとEthereumによる実践スマートコントラクト開発 ―Truffle Suiteを用いた開発の基礎からデプロイまで
by Kevin Solorio, Randall Kanna, David H. Hoover, 中城 元臣, 株式会社クイープ
Content preview from SolidityとEthereumによる実践スマートコントラクト開発 ―Truffle Suiteを用いた開発の基礎からデプロイまで
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7章FundraiserFactory
前章では、Fundraiserコントラクトを作成し、寄付や出金をサポートするための機能を実装した。Fundraiserコントラクトには多くの機能があるが、現時点では、このコントラクトを作成する手段がない。本章では、なじみがあると思われるFactoryパターンを使ってFundraiserの個々のインスタンスを作成するコントラクトを追加する。
本章では、GitHubリポジトリからUIを取得し、Ganacheにデプロイする手順も見ていく。UIがデプロイされたら、Webブラウザでアプリケーションを起動し、新しいFundraiserインスタンスを作成することで、寄付と資金の引き出しを行うことができる。
7.1 FundraiserFactoryのマイグレーション
前章のFundraiserコントラクトは、別のコントラクト（FundraiserFactory）によって初期化されることを前提として設計されていたため、マイグレーションを必要としていなかった。しかし、ユーザーがファクトリを操作してFundraiserインスタンスを作成するには、FundraiserFactoryをデプロイする必要がある。
まず、次のコマンドを使ってtestディレクトリに新しいファイルを作成する。
$ cd fundraiser $ touch test/fundraiser_factory_test.js
この新しいファイルにデプロイのテストケースを追加する（リスト7-1）。
リスト7-1：デプロイのテストケースを追加する（fundraiser_factory_test.js）
const FundraiserFactoryContract = artifacts.require("FundraiserFactory"); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.