Class: ToggleableFieldGenerator

Inherits:
Rails::Generators::NamedBase
  • Object
show all
Defined in:
lib/generators/toggleable_field/toggleable_field_generator.rb

Overview

lib/generators/toggleable_field/toggleable_field_generator.rb

Instance Method Summary collapse

Instance Method Details

#create_migration_file ⇒ Object 



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# File 'lib/generators/toggleable_field/toggleable_field_generator.rb', line 17

def create_migration_file
  # Step 1: 使用 rails generate migration 创建一个带时间戳的空迁移文件
  # 迁移类名通常为 AddFieldNameToTableName (e.g., AddActiveToUsers)
  migration_class_name = "Add#{field_name.camelize}To#{table_name.camelize}"
  
  # 调用 migration generator 创建骨架
  generate "migration", migration_class_name
  
  # Step 2: 找到刚刚生成的、带有最新时间戳的迁移文件
  # Rails generators 将文件添加到 pending 操作中，我们可以从这里获取路径
  # 更可靠的方法是搜索 db/migrate 目录下以该类名结尾的 .rb 文件
  generated_files = Dir.glob(Rails.root.join("db/migrate/*_#{migration_class_name.underscore}.rb"))
  if generated_files.empty?
    abort "Error: Failed to find the generated migration file for #{migration_class_name}."
  end
  
  # 取最新的一个（理论上应该只有一个）
  migration_file_path = generated_files.sort.last
  
  # Step 3: 读取现有内容并插入我们的代码
  content = <<~RUBY
    class #{migration_class_name} < ActiveRecord::Migration[#{migration_version}]
      def change
        add_column :#{table_name}, :#{field_name}, :boolean, default: true
        # Consider adding an index if you frequently query by this field
        # add_index :#{table_name}, :#{field_name}
      end
    end
  RUBY
  
  # 写入新内容
  File.open(migration_file_path, 'w') do |file|
    file.write(content)
  end
  
  # Step 4: 向用户报告
  log "\nUpdated migration file: #{migration_file_path.sub(Rails.root.to_s + '/', '')}"
end

#field_name ⇒ Object 



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# File 'lib/generators/toggleable_field/toggleable_field_generator.rb', line 5

def field_name
  file_name
end

#model_name ⇒ Object 



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# File 'lib/generators/toggleable_field/toggleable_field_generator.rb', line 9

def model_name
  options[:model] || file_name.singularize.classify
end

#table_name ⇒ Object 



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# File 'lib/generators/toggleable_field/toggleable_field_generator.rb', line 13

def table_name
  model_name.underscore.pluralize
end