How to establish diffrent database-connections

.gitignore

*.db

another_bi_test.rb

require "active_record"

module Database
  def self.config
    {
      :db1 => { adapter: "sqlite3", database: "db1.db" },
      :db2 => { adapter: "sqlite3", database: "db2.db" }
    }
  end
end

class Post < ActiveRecord::Base
  establish_connection Database.config[:db1]

  unless connection.table_exists?(table_name) then
    connection.create_table table_name, force: true do |t|
      t.string :title
      t.text :content
    end
  end
end

class User < ActiveRecord::Base
  establish_connection Database.config[:db2]

  unless connection.table_exists?(table_name) then
    connection.create_table table_name, force: true do |t|
      t.string :name
      t.timestamp :birthday
    end
  end
end