66 lines
2.3 KiB
Ruby
66 lines
2.3 KiB
Ruby
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 number method.
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#
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module Migration
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def self.included(base) #:nodoc:
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base.send :attr_reader, :migration_number,
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:migration_file_name,
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:migration_class_name
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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 number is appended
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# to the destination file name.
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#
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# The migration number, 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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# ==== Examples
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#
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# migration_template "migration.rb", "db/migrate/add_foo_to_bar.rb"
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#
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def migration_template(source, destination=nil, config={})
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destination = File.expand_path(destination || source, self.destination_root)
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migration_dir = File.dirname(destination)
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@migration_number = next_migration_number(migration_dir)
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@migration_file_name = File.basename(destination).sub(/\.rb$/, '')
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@migration_class_name = @migration_file_name.camelize
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destination = migration_exists?(migration_dir, @migration_file_name)
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if behavior == :invoke
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raise Error, "Another migration is already named #{@migration_file_name}: #{destination}" if destination
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destination = File.join(migration_dir, "#{@migration_number}_#{@migration_file_name}.rb")
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end
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template(source, destination, config)
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end
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protected
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def migration_lookup_at(dirname) #:nodoc:
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Dir.glob("#{dirname}/[0-9]*_*.rb")
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end
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def migration_exists?(dirname, file_name) #:nodoc:
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migration_lookup_at(dirname).grep(/\d+_#{file_name}.rb$/).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 NotImplementError
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end
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end
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end
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end
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