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author | Yehuda Katz + Carl Lerche <ykatz+clerche@engineyard.com> | 2009-09-24 14:01:31 -0700 |
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committer | Yehuda Katz + Carl Lerche <ykatz+clerche@engineyard.com> | 2009-09-24 16:11:41 -0700 |
commit | f0dd77c6be6a86fe384bb0015151e0a497973d39 (patch) | |
tree | ad81bb4c807c39edeaa37035882a16d9d95ebaa9 /railties/lib/rails/generators/migration.rb | |
parent | 610b81beca461a6fa4f00c7023e0e4315eb2b8be (diff) | |
download | rails-f0dd77c6be6a86fe384bb0015151e0a497973d39.tar.gz rails-f0dd77c6be6a86fe384bb0015151e0a497973d39.tar.bz2 rails-f0dd77c6be6a86fe384bb0015151e0a497973d39.zip |
Move railties/lib/* into railties/lib/*
Diffstat (limited to 'railties/lib/rails/generators/migration.rb')
-rw-r--r-- | railties/lib/rails/generators/migration.rb | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/railties/lib/rails/generators/migration.rb b/railties/lib/rails/generators/migration.rb new file mode 100644 index 0000000000..0a9151ecdf --- /dev/null +++ b/railties/lib/rails/generators/migration.rb @@ -0,0 +1,65 @@ +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 number method. + # + module Migration + def self.included(base) #:nodoc: + base.send :attr_reader, :migration_number, + :migration_file_name, + :migration_class_name + end + + # 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 "migration.rb", "db/migrate/add_foo_to_bar.rb" + # + def migration_template(source, destination=nil, config={}) + 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$/, '') + @migration_class_name = @migration_file_name.camelize + + destination = migration_exists?(migration_dir, @migration_file_name) + + if behavior == :invoke + raise Error, "Another migration is already named #{@migration_file_name}: #{destination}" if destination + destination = File.join(migration_dir, "#{@migration_number}_#{@migration_file_name}.rb") + end + + template(source, destination, config) + end + + protected + + def migration_lookup_at(dirname) #:nodoc: + Dir.glob("#{dirname}/[0-9]*_*.rb") + end + + def migration_exists?(dirname, file_name) #:nodoc: + migration_lookup_at(dirname).grep(/\d+_#{file_name}.rb$/).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 NotImplementError + end + + end + end +end |