<% if Order.find_by(item_id: @item.id)==nil%>
<% if user_signed_in? && current_user.id == @item.user.id %><中略><% elsif user_signed_in?%>
<中略><% end %><% end %>
app/views/items/show.html.erb
<% if @item.order==nil%>
<% if user_signed_in? && current_user.id == @item.user.id %><中略><% elsif user_signed_in?%>
<中略><% end %><% end %>
現在制作中のオリジナルアプリにフォロー機能を実装しており、そのフォロー機能のモデルの単体テストを実装していました。その時に、「KeyError: Factory not registered:」というエラーが発生して苦戦したため、解決方法を自分用にメモを残しておこうと思います。
（といっても、振り返れば非常に単純なことでした?）
Please select the geographic area in which you live. Subsequent configuration
questions will narrow this down by presenting a list of cities, representing
the time zones in which they are located.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd"><htmllang="ja"><head><metahttp-equiv="content-type"content="text/html; charset=utf-8"><%=css_tag%>
#! /usr/bin/ruby# -*- encoding: utf-8 -*-## basic01.rb## Nov/26/2020# ---------------------------------------------------------------------project_id="project-translation"text="Es war einmal ein kleines Mädchen."language_code="ja"require"google/cloud/translate"translate=Google::Cloud::Translate.translation_v2_serviceproject_id: project_idtranslation=translate.translatetext,to: language_codeputs"Translated '#{text}' to '#{translation.text.inspect}'"puts"Original language: #{translation.from} translated to: #{translation.to}"## ---------------------------------------------------------------------
<h1>Products#index</h1><p>Find me in app/views/products/index.html.erb</p><divclass="#"><%@products.eachdo|product|%> #ここで@productsを定義してるので、コントローラーでも定義が必要です。
<%=product.name%><%=product.text%><%end%></div>
$ rails new training_app -d mysql
～略～
An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'` succeeds before bundling.
～略～
$ sudo yum install -y mysql-devel
$ ls
app bin config config.ru db Gemfile lib log package.json public Rakefile README.md storage test tmp vendor
サーバー起動
プロジェクトディレクトリに移動してから実行します。
$ cd training_app
$ rails s
=> Booting Puma
=> Rails 6.0.3.4 application starting in development
=> Run `rails server --help` for more startup options
Exiting
Traceback (most recent call last):
～略～
/home/ec2-user/.rvm/gems/ruby-2.6.3/gems/webpacker-4.3.0/lib/webpacker/configuration.rb:95:in `rescue in load': Webpacker configuration file not found /home/ec2-user/rails-training/training_app/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - /home/ec2-user/rails-training/training_app/config/webpacker.yml (RuntimeError)
<config/application.rb>
require_relative 'boot'
require 'rails/all'
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)
module TrainingApp
class Application < Rails::Application
# Initialize configuration defaults for originally generated Rails version.
config.load_defaults 6.0
#以下一文を追加。末尾が"amazonaws.com"のドメインは許可する。
config.hosts << ".amazonaws.com"
# Settings in config/environments/* take precedence over those specified here.
# Application configuration can go into files in config/initializers
# -- all .rb files in that directory are automatically loaded after loading
# the framework and any gems in your application.
end
end
これで表示されることを信じてサーバーを起動。
$ rails s
Mysql2::Error::ConnectionError
Access denied for user 'root'@'localhost' (using password: NO)
