One file ActiveRecord script

gistfile1.txt

require 'bundler/inline'

gemfile(true) do
  source 'https://rubygems.org'

  gem 'sqlite3', '~> 1.4'
  gem 'activerecord', '7.1.3.4'
end

require 'sqlite3'
require 'active_record'

ActiveRecord::Base.establish_connection(
  adapter: 'sqlite3',
  database: ':memory:'
)

ActiveRecord::Schema.define do
  # Create table here, e.g.
  # create_table :users, force: true do |t|
  #   t.string :name, null: false
  # end
  #
  # create_table :posts, force: true do |t|
  #   t.belongs_to :user, index: true, null: false
  #   t.string :title, null: false
  # end
end

# Define models here, e.g.
# class User < ActiveRecord::Base
#   has_many :posts
# end
#
# class Post < ActiveRecord::Base
#   belongs_to :user
# end

# Run code here...
# user = User.create!(name: 'User 1')
# user.posts.create!(title: 'Post 1')
# user.posts.create!(title: 'Post 2')
#
# puts "user.posts.count: #{user.posts.count}"