如何使用activerecord-sinatra为PostqreSQL添加行？

Question

我后来安装了PostgreSQL

1 - 安装宝石pg

2 - 已安装的宝石：

gem install activerecord 
gem install sinatra-activerecord 
gem install rake

3 - 我创建了连接数据库到app.rb的文件

# app.rb 
configure :development do set :database, {adapter: "postgresql",  encoding: "unicode", database: "your_database_name", pool: 2, username: "your_username", password: "your_password"}
end

configure :production do
  set :database, {adapter: "postgresql",  encoding: "unicode", database: "your_database_name", pool: 2, username: "your_username", password: "your_password"}
end

4 - 创建app.rb文件的模型

class Article < ActiveRecord::Base
end

5 - 创建到Rakefile的迁移

require 'sinatra/activerecord'
require 'sinatra/activerecord/rake'
require './app'

6 - rake db:create_migration NAME=create_articles

7 - 在由文件迁移创建的新文件中

class CreateArticles < ActiveRecord::Migration
    def change
        create_table :articles do |t|
          t.string :title
          t.string :content
          t.boolean :published, :default => false
          t.datetime :published_on, :required => false
          t.integer :likes, :default => 0
          t.timestamps null: false
        end
      end
    end 

8 - 我完成了命令db:create和rake db:migration

创建数据库，显示psql控制台中的数据库。现在如何在sinatra中添加数据库线？

Answer 1

要创建新文章，请使用：

Article.create(title: your_title, content: your_content, published: true, published_on: Time.now)

按ID查找文章：

Article.find(id)

对于更新文章：

article = Article.find(id)
article.update(title: your_title, content: your_content, published: true, published_on: Time.now)

对于删除文章记录：

article = Article.find(id)
article.destroy

AR文件：

1. 持久性 - https://www.rubydoc.info/gems/activerecord/ActiveRecord/Persistence
2. 寻找：https://www.rubydoc.info/gems/activerecord/ActiveRecord/FinderMethods
3. 对于复杂的查询：https://www.rubydoc.info/gems/activerecord/ActiveRecord/QueryMethods