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branch: rework_initial…
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require 'active_support/concern'
require 'rails/generators/actions/create_migration'
module Rails
module Generators
# Holds common methods for migrations. It assumes that migrations has the
# [0-9]*_name format and can be used by another frameworks (like Sequel)
# just by implementing the next migration version method.
module Migration
extend ActiveSupport::Concern
attr_reader :migration_number, :migration_file_name, :migration_class_name
module ClassMethods
def migration_lookup_at(dirname) #:nodoc:
Dir.glob("#{dirname}/[0-9]*_*.rb")
end
def migration_exists?(dirname, file_name) #:nodoc:
migration_lookup_at(dirname).grep(/\d+_#{file_name}.rb$/).first
end
def current_migration_number(dirname) #:nodoc:
migration_lookup_at(dirname).collect do |file|
File.basename(file).split("_").first.to_i
end.max.to_i
end
def next_migration_number(dirname) #:nodoc:
raise NotImplementedError
end
end
def create_migration(destination, data, config = {}, &block)
action Rails::Generators::Actions::CreateMigration.new(self, destination, block || data.to_s, config)
end
def set_migration_assigns!(destination)
destination = File.expand_path(destination, self.destination_root)
migration_dir = File.dirname(destination)
@migration_number = self.class.next_migration_number(migration_dir)
@migration_file_name = File.basename(destination, '.rb')
@migration_class_name = @migration_file_name.camelize
end
# Creates a migration template at the given destination. The difference
# to the default template method is that the migration version is appended
# to the destination file name.
#
# The migration version, migration file name, migration class name are
# available as instance variables in the template to be rendered.
#
# migration_template "migration.rb", "db/migrate/add_foo_to_bar.rb"
def migration_template(source, destination, config = {})
source = File.expand_path(find_in_source_paths(source.to_s))
set_migration_assigns!(destination)
context = instance_eval('binding')
dir, base = File.split(destination)
numbered_destination = File.join(dir, ["%migration_number%", base].join('_'))
create_migration numbered_destination, nil, config do
ERB.new(::File.binread(source), nil, '-', '@output_buffer').result(context)
end
end
end
end
end
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