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