Kievbuy
6/25/2018 - 12:08 PM
ActiveRecord without rails
User activerecord with pure ruby
$ rake db:create # create the db $ rake db:migrate # run migrations $ rake db:drop # delete the db $ rake db:reset # combination of the upper three $ rake db:schema # creates a schema file of the current database $ rake g:migration your_migration # generates a new migration file
require "active_record"
namespace :db do
db_config = YAML::load(File.open('config/database.yml'))
db_config_admin = db_config.merge({'database' => 'postgres', 'schema_search_path' => 'public'})
desc "Create the database"
task :create do
ActiveRecord::Base.establish_connection(db_config_admin)
ActiveRecord::Base.connection.create_database(db_config["database"])
puts "Database created."
end
desc "Migrate the database"
task :migrate do
ActiveRecord::Base.establish_connection(db_config)
ActiveRecord::Migrator.migrate("db/migrate/")
Rake::Task["db:schema"].invoke
puts "Database migrated."
end
task :rollback do
ActiveRecord::Base.establish_connection(db_config)
ActiveRecord::MigrationContext.new("db/migrate/").rollback
Rake::Task["db:schema"].invoke
puts "Last migration has been reverted."
end
desc "Drop the database"
task :drop do
ActiveRecord::Base.establish_connection(db_config_admin)
ActiveRecord::Base.connection.drop_database(db_config["database"])
puts "Database deleted."
end
desc "Reset the database"
task :reset => [:drop, :create, :migrate]
desc 'Create a db/schema.rb file that is portable against any DB supported by AR'
task :schema do
ActiveRecord::Base.establish_connection(db_config)
require 'active_record/schema_dumper'
filename = "db/schema.rb"
File.open(filename, "w:utf-8") do |file|
ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, file)
end
end
end
namespace :g do
desc "Generate migration"
task :migration do
name = ARGV[1] || raise("Specify name: rake g:migration your_migration")
timestamp = Time.now.strftime("%Y%m%d%H%M%S")
path = File.expand_path("../db/migrate/#{timestamp}_#{name}.rb", __FILE__)
migration_class = name.split("_").map(&:capitalize).join
File.open(path, 'w') do |file|
file.write <<-EOF
class #{migration_class} < ActiveRecord::Migration
def self.up
end
def self.down
end
end
EOF
end
puts "Migration #{path} created"
abort # needed stop other tasks
end
end
# config/database.yml
host: 'localhost'
adapter: 'postgresql'
encoding: utf-8
database: 'test'