2004-11-23 20:04:44 -05:00
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module ActionView
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# There's also a convenience method for rendering sub templates within the current controller that depends on a single object
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# (we call this kind of sub templates for partials). It relies on the fact that partials should follow the naming convention of being
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# prefixed with an underscore -- as to separate them from regular templates that could be rendered on their own. In the template for
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# Advertiser#buy, we could have:
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#
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# <% for ad in @advertisements %>
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# <%= render_partial "ad", ad %>
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# <% end %>
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#
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# This would render "advertiser/_ad.rhtml" and pass the local variable +ad+ to the template for display.
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#
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# == Rendering a collection of partials
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#
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2005-02-07 09:15:53 -05:00
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# The example of partial use describes a familiar pattern where a template needs to iterate over an array and render a sub
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2004-11-23 20:04:44 -05:00
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# template for each of the elements. This pattern has been implemented as a single method that accepts an array and renders
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# a partial by the same name as the elements contained within. So the three-lined example in "Using partials" can be rewritten
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# with a single line:
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#
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# <%= render_collection_of_partials "ad", @advertisements %>
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#
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# This will render "advertiser/_ad.rhtml" and pass the local variable +ad+ to the template for display. An iteration counter
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# will automatically be made available to the template with a name of the form +partial_name_counter+. In the case of the
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# example above, the template would be fed +ad_counter+.
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#
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# == Rendering shared partials
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#
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# Two controllers can share a set of partials and render them like this:
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#
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# <%= render_partial "advertisement/ad", ad %>
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#
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# This will render the partial "advertisement/_ad.rhtml" regardless of which controller this is being called from.
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module Partials
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def render_partial(partial_path, object = nil, local_assigns = {})
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path, partial_name = partial_pieces(partial_path)
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object ||= controller.instance_variable_get("@#{partial_name}")
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2004-12-12 06:48:01 -05:00
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counter_name = partial_counter_name(partial_name)
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local_assigns = local_assigns.merge(counter_name => 1) unless local_assigns.has_key?(counter_name)
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2004-11-23 20:04:44 -05:00
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render("#{path}/_#{partial_name}", { partial_name => object }.merge(local_assigns))
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end
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2005-01-10 19:27:33 -05:00
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def render_collection_of_partials(partial_name, collection, partial_spacer_template = nil, local_assigns = {})
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2004-11-23 20:04:44 -05:00
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collection_of_partials = Array.new
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2004-12-12 06:48:01 -05:00
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counter_name = partial_counter_name(partial_name)
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2004-11-23 20:04:44 -05:00
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collection.each_with_index do |element, counter|
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2005-01-10 19:27:33 -05:00
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collection_of_partials.push(render_partial(partial_name, element, { counter_name => counter }.merge(local_assigns)))
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2004-11-23 20:04:44 -05:00
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end
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return nil if collection_of_partials.empty?
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if partial_spacer_template
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spacer_path, spacer_name = partial_pieces(partial_spacer_template)
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collection_of_partials.join(render("#{spacer_path}/_#{spacer_name}"))
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else
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collection_of_partials
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end
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end
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private
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def partial_pieces(partial_path)
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if partial_path.include?('/')
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return File.dirname(partial_path), File.basename(partial_path)
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else
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2005-02-14 20:45:35 -05:00
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return controller.class.controller_path, partial_path
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2004-11-23 20:04:44 -05:00
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end
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end
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2004-12-12 06:48:01 -05:00
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def partial_counter_name(partial_name)
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"#{partial_name.split('/').last}_counter"
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end
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2004-11-23 20:04:44 -05:00
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end
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end
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