setup

# File actionview/lib/action_view/renderer/partial_renderer.rb, line 356
    def setup(context, options, block)
      @view   = context
      @options = options
      @block   = block

      @locals  = options[:locals] || {}
      @details = extract_details(options)

      prepend_formats(options[:formats])

      partial = options[:partial]

      if String === partial
        @has_object = options.key?(:object)
        @object     = options[:object]
        @collection = collection_from_options
        @path       = partial
      else
        @has_object = true
        @object = partial
        @collection = collection_from_object || collection_from_options

        if @collection
          paths = @collection_data = @collection.map { |o| partial_path(o) }
          @path = paths.uniq.one? ? paths.first : nil
        else
          @path = partial_path
        end
      end

      if as = options[:as]
        raise_invalid_option_as(as) unless as.to_s =~ /\A[a-z_]\w*\z/
        as = as.to_sym
      end

      if @path
        @variable, @variable_counter, @variable_iteration = retrieve_variable(@path, as)
        @template_keys = retrieve_template_keys
      else
        paths.map! { |path| retrieve_variable(path, as).unshift(path) }
      end

      self
    end