instance method get_local_assigns

# File railties/lib/rails_generator/generators/components/migration/migration_generator.rb, line 10
    def get_local_assigns
      {}.tap do |assigns|
        if class_name.underscore =~ /^(add|remove)_.*_(?:to|from)_(.*)/
          assigns[:migration_action] = $1
          assigns[:table_name]       = $2.pluralize
        else
          assigns[:attributes] = []
        end
      end
    end