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@kamipo

ActiveRecordのデフォルトのインデックス名が長いのが気になる

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たとえばActiveRecordでusersテーブルのemailカラムにインデックスを張ると、デフォルトのインデックス名がindex_users_on_emailみたいな冗長な名前になるのがうざいのでデフォルトはもっとすっきりさせることにする。

config/initializers/ar_simple_index_name.rb
ActiveSupport.on_load :active_record do
  module ActiveRecord::ConnectionAdapters

    # simple index name
    module SchemaStatements
      def index_name_with_simple(table_name, options)
        if Hash === options && options[:column]
          Array.wrap(options[:column]) * '_and_'
        else
          index_name_without_simple(table_name, options)
        end 
      end 
      alias_method_chain :index_name, :simple
    end 

  end 
end

こうしとくとusersテーブルのemailカラムにインデックスを張ると、デフォルトのインデックス名はemailになって、tigerカラムとbunnyカラムの複合キーのデフォルトのインデックス名もtiger_and_bunnyとすっきりしていい感じになる。

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13
Help us understand the problem. What is going on with this article?