| Class | Rails::Generator::Commands::Base |
| In: |
vendor/rails/railties/lib/rails_generator/commands.rb
|
| Parent: | DelegateClass(Rails::Generator::Base) |
Generator commands delegate Rails::Generator::Base and implement a standard set of actions. Their behavior is defined by the way they respond to these actions: Create brings life; Destroy brings death; List passively observes.
Commands are invoked by replaying (or rewinding) the generator‘s manifest of actions. See Rails::Generator::Manifest and Rails::Generator::Base#manifest method that generator subclasses are required to override.
Commands allows generators to "plug in" invocation behavior, which corresponds to the GoF Strategy pattern.
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 45
45: def dependency(generator_name, args, runtime_options = {})
46: logger.dependency(generator_name) do
47: self.class.new(instance(generator_name, args, full_options(runtime_options))).invoke!
48: end
49: end
Replay action manifest. RewindBase subclass rewinds manifest.
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 41
41: def invoke!
42: manifest.replay(self)
43: end
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 72
72: def current_migration_number
73: Dir.glob("#{RAILS_ROOT}/#{@migration_directory}/[0-9]*_*.rb").inject(0) do |max, file_path|
74: n = File.basename(file_path).split('_', 2).first.to_i
75: if n > max then n else max end
76: end
77: end
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 64
64: def existing_migrations(file_name)
65: Dir.glob("#{@migration_directory}/[0-9]*_*.rb").grep(/[0-9]+_#{file_name}.rb$/)
66: end
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 87
87: def gsub_file(relative_destination, regexp, *args, &block)
88: path = destination_path(relative_destination)
89: content = File.read(path).gsub(regexp, *args, &block)
90: File.open(path, 'wb') { |file| file.write(content) }
91: end
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 60
60: def migration_directory(relative_path)
61: directory(@migration_directory = relative_path)
62: end
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 68
68: def migration_exists?(file_name)
69: not existing_migrations(file_name).empty?
70: end
# File vendor/rails/railties/lib/rails_generator/commands.rb, line 79
79: def next_migration_number
80: current_migration_number + 1
81: end