如何覆盖Rails默认的迁移生成器模板

Question

我需要覆盖这些迁移模板：

https://github.com/rails/rails/blob/e20dd73df42d63b206d221e2258cc6dc7b1e6068/activerecord/lib/rails/generators/active_record/migration/templates/migration.rb 和https://github.com/rails/rails/blob/e20dd73df42d63b206d221e2258cc6dc7b1e6068/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb

在我的rails应用程序中，这样它们就可以从rails应用程序中获取模板而不是从gem本身获取了。到目前为止，我已经尝试了所有可能的组合，但没有成功。

我尝试过的内容：

- Rails.root/lib/templates/rails/migration/migration.rb
- Rails.root/lib/templates/rails/migration_generator/migration.rb
- Rails.root/lib/rails/templates/rails/migration/migration.rb
- Rails.root/lib/rails/templates/rails/migration_generator/migration.rb
- Rails.root/lib/rails/generators/templates/rails/migration/migration.rb
- Rails.root/lib/rails/generators/templates/rails/migration_generator/migration.rb
- Rails.root/lib/rails/templates/generators/rails/migration/migration.rb
- Rails.root/lib/rails/templates/generators/rails/migration_generator/migration.rb
- Rails.root/lib/rails/generators/active_record/migration/templates/migration.rb
- Rails.root/lib/rails/generators/active_record/migration_generator/templates/migration.rb
- Rails.root/lib/rails/generators/active_record/templates/migration.rb
- Rails.root/lib/rails/generators/active_record/templates/migration.rb

有人能指导我正确的方向吗？（涉及IT技术）

- Surya

Answer 1

我找到了一个解决办法：

我使用以下命令（在我的Rails应用程序目录内）创建了一个Rails生成器——

rails g generator my_migrator

它创建：

lib/generators/my_migrator/my_migrator.rb
lib/generators/my_migrator/templates
lib/generators/my_migrator/USAGE

然后我添加了这段代码来扩展我的生成器中的 Rails 迁移生成器，将以下代码添加到 my_generator.rb 中：

require 'rails/generators'
require 'rails/generators/active_record'
require 'rails/generators/actions/create_migration'

class MyGenerator < ActiveRecord::Generators::Base
  source_root File.expand_path('../templates', __FILE__)
  argument :attributes, :type => :array, :default => [], :banner => "field[:type][:index] field[:type][:index]"

  def create_migration_file
    set_local_assigns!
    validate_file_name!
    migration_template @migration_template, "db/migrate/#{file_name}.rb"
    # more code here as per requirement.
  end

  # more code below as per requirement..
end

我希望这篇文章能够在未来某一天帮助到需要的人。

- Surya