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包含遷移的共用方法。它假設遷移採用 [0-9]*_name 格式，只要實作 next_migration_number 方法，就可以由其他架構（例如 Sequel）使用。

方法
C
M
S

屬性

[R] migration_class_name
[R] migration_file_name
[R] migration_number

執行個體公開方法

create_migration(destination, data, config = {}, &block)

來源： 顯示 | 在 GitHub 上

# File railties/lib/rails/generators/migration.rb, line 35
def create_migration(destination, data, config = {}, &block)
  action Rails::Generators::Actions::CreateMigration.new(self, destination, block || data.to_s, config)
end

migration_template(source, destination, config = {})

在指定的目的地建立遷移範本。與預設範本方法的差異在於，將遷移號碼加在目標檔案名稱之前。

遷移號碼、遷移檔案名稱、遷移類別名稱可用作即將呈現的範本中的執行個體變數。

migration_template "migration.rb", "db/migrate/add_foo_to_bar.rb"

來源： 顯示 | 在 GitHub 上

# File railties/lib/rails/generators/migration.rb, line 56
def migration_template(source, destination, config = {})
  source = File.expand_path(find_in_source_paths(source.to_s))

  set_migration_assigns!(destination)

  dir, base = File.split(destination)
  numbered_destination = File.join(dir, ["%migration_number%", base].join("_"))

  file = create_migration numbered_destination, nil, config do
    ERB.new(::File.binread(source), trim_mode: "-", eoutvar: "@output_buffer").result(binding)
  end
  Rails::Generators.add_generated_file(file)
end

set_migration_assigns!(destination)

來源： 顯示 | 在 GitHub 上

# File railties/lib/rails/generators/migration.rb, line 39
def set_migration_assigns!(destination)
  destination = File.expand_path(destination, 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