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vendor/rails/railties/lib/rails_generator/generators/components/migration/migration_generator.rb

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class MigrationGenerator < Rails::Generator::NamedBase  

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  def manifest

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    record do |m|

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      m.migration_template 'migration.rb', 'db/migrate', :assigns => get_local_assigns

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    end

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  end

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  private  

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    def get_local_assigns

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      returning(assigns = {}) do

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        if class_name.underscore =~ /^(add|remove)_.*_(?:to|from)_(.*)/

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          assigns[:migration_action] = $1

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          assigns[:table_name]       = $2.pluralize

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        else

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          assigns[:attributes] = []

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        end

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      end

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    end

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end

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