はてなブックマーク

const readlineSync = require('readline-sync'); const nem = require("nem-sdk").default; const QRCode = require('qrcode'); class NemOfflineTransaction { constructor(networkId) { this.networkId = networkId; } start() { // [1] 入力 this.keyIn(); // [2] 確認 this.confirm(); // [3] 署名付きのトランザクション生成 const tx = this.generateTransaction(); // [4] QRコードへ変換 this.generateQRCode(tx); } keyIn() { this.recipient = re

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GoogleAnalyticsのカスタムキャンペーンを利用することで、 リファラーなしの遷移や、出稿した有料のWeb広告からのトラフィック分析を することができる。 この機能はURLクエリパラメータ上にutm_campaignやutm_medium等 を含めることで使えるようになる。 Qiitaのメールマガジン上のURLをクリックした際にも、utm_campaign等が付与されていますね。 AdWordsへ出稿した場合はこれらのパラメータが自動で付与されます。 上記URLの例に記載されている http://www.example.com/?utm_campaign=spring&utm_medium=email&utm_source=newsletter1 がクリックされた場合、GoogleAnalyticsには以下の2.が記載される。 (GoogleAnalytics上で[トラフィック]

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Railsで簡単に可逆暗号をする方法 情報が古くなったため、rails4.2, rails5.0, rails5.1, rails5.2, rails6.0 で変更点確認し更新 使い方 ActiveSupport::MessageEncryptor を利用することで簡単に可逆暗号ができる key_len = ActiveSupport::MessageEncryptor.key_len secret = Rails.application.key_generator.generate_key('salt', key_len) crypt = ActiveSupport::MessageEncryptor.new(secret) encrypted = crypt.encrypt_and_sign('Qiitaきーたキータ') # => "Adp1SPOkYRqLgTMoAlcyEganoi

author = Author.create!(name: 'foo') book1 = Book.create!(title: 'bar') book2 = Book.create!(title: 'baz', author_id: author.id)

require 'timeout' # ... def index # 3秒たってもデータが取れなければ、Timeout::Errorがraiseされる Timeout::timeout(3) do # データ取りに行く end rescue Timeout::Error render text: 'XXXサーバが遅いみたい' end # ... class Archive require 'timeout' @queue = :file_serve def self.perform(repo_id, branch = 'master') repo = Repository.find(repo_id) # このJobがやりたいこととtransaction doは関係ないけど ActiveRecord::Base.transaction do Timeout::timeout(3) do r

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