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包含迁移的通用方法。它假定迁移的格式为 [0-9]*_name，并且可以通过实现 next_migration_number 方法被其他框架（如 Sequel）使用。

方法
C
M
S

Attributes

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

实例公共方法

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

来源： 显示 | 在 GitHub 上

# File railties/lib/rails/generators/migration.rb, line 34
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 = {})

在给定的目标位置创建一个迁移模板。与默认模板方法的区别在于，迁移编号会添加到目标文件名之前。

迁移编号、迁移文件名、迁移类名可以在要渲染的模板中作为实例变量使用。

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

来源： 显示 | 在 GitHub 上

# File railties/lib/rails/generators/migration.rb, line 55
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)

来源： 显示 | 在 GitHub 上

# File railties/lib/rails/generators/migration.rb, line 38
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