I have learned that Sequel ORM was simple and is the preferred ORM for Sinatra developers. But I feel so attached to ActiveRecord right now. Basically some of the gems I am using are actually extensions to ActiveRecord and I have grown to love these Ruby gems despite being ActiveRecord-centric. They wouldn't work with DataMapper or anything else.

Creating migrations in Sinatra is simple. Just create db/migrate folder. Create a db/config.yml which is similar to database.yml in Rails.

Example config file:

development:
  adapter: mysql
  encoding: utf8
  database: mywayorthehighway
  username: root
  password: 

Of course, you can have other environments there.

The very lengthy code below is the magic that makes migrations work. Add them up on the Rakefile.

require 'rake'
require 'active_record'
require 'yaml'
require 'logger'

desc "Import DB"
task :import => :environment do
  url = ENV['URL'] or raise "No url specified, use URL="

  require 'rest_client'
  posts = YAML.load RestClient.get(url)

  posts.each do |post|
    DB[:posts] << post
  end
end

task :default => :dbsetup

task :loadconfig do
  DBconfig = YAML::load( File.open('db/config.yml') )['development']
end

desc "Setup db"
task :dbsetup => :loadconfig do
  create(DBconfig)
  migrate(DBconfig)
end

desc "Do migrations"
task :migrate => :loadconfig do
  migrate(DBconfig)
end

def create( config )
  begin
    if config['adapter'] =~ /sqlite/
      if File.exist?(config['database'])
        $stderr.puts "#{config['database']} already exists"
      else
        begin
          # Create the SQLite database
          ActiveRecord::Base.establish_connection(config)
          ActiveRecord::Base.connection
        rescue
          $stderr.puts $!, *($!.backtrace)
          $stderr.puts "Couldn't create database for #{config.inspect}"
        end
      end
    return # Skip the else clause of begin/rescue
    else
      ActiveRecord::Base.establish_connection(config)
      ActiveRecord::Base.connection
    end
  rescue
    case config['adapter']
    when 'mysql'
      @charset = ENV['CHARSET'] || 'utf8'
      @collation = ENV['COLLATION'] || 'utf8_general_ci'
      begin
        ActiveRecord::Base.establish_connection(config.merge('database' => nil))
        ActiveRecord::Base.connection.create_database(config['database'], :charset => (config['charset'] || @charset), 
                                                      :collation => (config['collation'] || @collation))
        ActiveRecord::Base.establish_connection(config)
      rescue
        $stderr.puts "Couldn't create database for #{config.inspect}, charset: #{config['charset'] || @charset}, 
  collation: #{config['collation'] || @collation}"
      end
    when 'postgresql'
      @encoding = config[:encoding] || ENV['CHARSET'] || 'utf8'
      begin
        ActiveRecord::Base.establish_connection(config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
        ActiveRecord::Base.connection.create_database(config['database'], config.merge('encoding' => @encoding))
        ActiveRecord::Base.establish_connection(config)
      rescue
        $stderr.puts $!, *($!.backtrace)
        $stderr.puts "Couldn't create database for #{config.inspect}"
      end
    end
  else
    $stderr.puts "#{config['database']} already exists"
  end
end

def migrate( config )
  ActiveRecord::Base.logger = Logger.new(STDOUT)
  ActiveRecord::Base.establish_connection(config)
  ActiveRecord::Migrator.up "db/migrate/"
end

So let's check that before running "rake."

rake -T
(in /Users/name/web/dir)
rake dbsetup  # Setup db
rake import   # Import DB
rake migrate  # Do migrations
rake start    # Start the app server
rake stop     # Stop the app server
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Hello! I am Kat. I've been a developer for several years. When I'm not sitting down, reading and working for long hours, I am traveling to some place of interest.
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