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require 'generators/named_base'
require 'active_record'
module ActiveRecord
module Generators
module Migration
# Creates a migration template at the given destination. The difference
# to the default template method is that the migration number is appended
# to the destination file name.
#
# The migration number, migration file name, migration class name are
# available as instance variables in the template to be rendered.
#
# ==== Examples
#
# migration_template "migrate.rb", "db/migrate/add_foo_to_bar"
#
def migration_template(source, destination=nil, log_status=true)
destination = File.expand_path(destination || source, self.destination_root)
migration_dir = File.dirname(destination)
@migration_number = next_migration_number(migration_dir)
@migration_file_name = File.basename(destination).sub(/\.rb$/, '')
@migration_class_name = @migration_file_name.camelize
if existing = migration_exists?(migration_dir, @migration_file_name)
raise Rails::Generators::Error, "Another migration is already named #{@migration_file_name}: #{existing}"
end
destination = File.join(migration_dir, "#{@migration_number}_#{@migration_file_name}.rb")
template(source, destination, log_status)
end
protected
def migration_exists?(dirname, file_name) #:nodoc:
Dir.glob("#{dirname}/[0-9]*_*.rb").grep(/\d+_#{file_name}.rb$/).first
end
def current_migration_number(dirname) #:nodoc:
Dir.glob("#{dirname}/[0-9]*_*.rb").collect{ |f| f.split("_").first.to_i }.max
end
def next_migration_number(dirname) #:nodoc:
if ActiveRecord::Base.timestamped_migrations
Time.now.utc.strftime("%Y%m%d%H%M%S")
else
"%.3d" % (current_migration_number(dirname) + 1)
end
end
end
class Base < Rails::Generators::NamedBase
include Migration
end
end
end
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