2009-01-22 22:18:10 +00:00
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module ActionView
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module Rendering
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# Returns the result of a render that's dictated by the options hash. The primary options are:
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#
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# * <tt>:partial</tt> - See ActionView::Partials.
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# * <tt>:update</tt> - Calls update_page with the block given.
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# * <tt>:file</tt> - Renders an explicit template file (this used to be the old default), add :locals to pass in those.
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# * <tt>:inline</tt> - Renders an inline template similar to how it's done in the controller.
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# * <tt>:text</tt> - Renders the text passed in out.
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#
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# If no options hash is passed or :update specified, the default is to render a partial and use the second parameter
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# as the locals hash.
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def render(options = {}, local_assigns = {}, &block) #:nodoc:
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local_assigns ||= {}
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@exempt_from_layout = true
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case options
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when Hash
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options[:locals] ||= {}
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layout = options[:layout]
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return _render_partial_with_layout(layout, options) if options.key?(:partial)
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return _render_partial_with_block(layout, block, options) if block_given?
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2009-04-23 00:16:28 +00:00
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layout = find_by_parts(layout, {:formats => formats}) if layout
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2009-01-22 22:18:10 +00:00
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if file = options[:file]
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2009-04-23 00:16:28 +00:00
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template = find_by_parts(file, {:formats => formats})
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2009-01-22 22:18:10 +00:00
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_render_template_with_layout(template, layout, :locals => options[:locals])
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elsif inline = options[:inline]
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_render_inline(inline, layout, options)
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elsif text = options[:text]
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_render_text(text, layout, options)
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end
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when :update
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update_page(&block)
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when String, NilClass
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_render_partial(:partial => options, :locals => local_assigns)
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end
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end
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def _render_content_with_layout(content, layout, locals)
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return content unless layout
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locals ||= {}
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if controller && layout
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2009-04-29 04:29:29 +00:00
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@_layout = layout.identifier
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2009-04-23 22:58:38 +00:00
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logger.info("Rendering template within #{layout.identifier}") if logger
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2009-01-22 22:18:10 +00:00
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end
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begin
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2009-06-18 01:08:45 +00:00
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old_content, @_content_for[:layout] = @_content_for[:layout], content
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2009-01-22 22:18:10 +00:00
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2009-06-18 01:08:45 +00:00
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@cached_content_for_layout = @_content_for[:layout]
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2009-01-22 22:18:10 +00:00
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_render_template(layout, locals)
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ensure
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2009-06-18 01:08:45 +00:00
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@_content_for[:layout] = old_content
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2009-01-22 22:18:10 +00:00
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end
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end
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2009-06-18 01:55:10 +00:00
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# You can think of a layout as a method that is called with a block. This method
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# returns the block that the layout is called with. If the user calls yield :some_name,
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# the block, by default, returns content_for(:some_name). If the user calls yield,
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# the default block returns content_for(:layout).
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#
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# The user can override this default by passing a block to the layout.
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#
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# ==== Example
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#
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# # The template
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# <% render :layout => "my_layout" do %>Content<% end %>
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#
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# # The layout
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# <html><% yield %></html>
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#
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# In this case, instead of the default block, which would return content_for(:layout),
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# this method returns the block that was passed in to render layout, and the response
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# would be <html>Content</html>.
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#
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# Finally, the block can take block arguments, which can be passed in by yield.
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#
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# ==== Example
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#
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# # The template
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2009-06-18 18:14:44 +00:00
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# <% render :layout => "my_layout" do |customer| %>Hello <%= customer.name %><% end %>
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2009-06-18 01:55:10 +00:00
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#
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# # The layout
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# <html><% yield Struct.new(:name).new("David") %></html>
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#
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# In this case, the layout would receive the block passed into <tt>render :layout</tt>,
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# and the Struct specified in the layout would be passed into the block. The result
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# would be <html>Hello David</html>.
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def layout_proc(name)
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@_default_layout ||= proc { |*names| @_content_for[names.first || :layout] }
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!@_content_for.key?(name) && @_proc_for_layout || @_default_layout
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end
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2009-01-22 22:18:10 +00:00
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def _render_template(template, local_assigns = {})
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2009-04-13 22:18:45 +00:00
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with_template(template) do
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template.render(self, local_assigns) do |*names|
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2009-06-18 01:55:10 +00:00
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capture(*names, &layout_proc(names.first))
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2009-04-13 22:18:45 +00:00
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end
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2009-01-22 22:18:10 +00:00
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end
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rescue Exception => e
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2009-06-18 19:08:50 +00:00
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if e.is_a?(TemplateError)
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2009-01-22 22:18:10 +00:00
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e.sub_template_of(template)
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raise e
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else
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raise TemplateError.new(template, assigns, e)
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end
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end
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def _render_inline(inline, layout, options)
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2009-04-23 22:58:38 +00:00
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handler = Template.handler_class_for_extension(options[:type] || "erb")
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template = Template.new(options[:inline], "inline #{options[:inline].inspect}", handler, {})
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content = _render_template(template, options[:locals] || {})
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2009-01-22 22:18:10 +00:00
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layout ? _render_content_with_layout(content, layout, options[:locals]) : content
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end
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def _render_text(text, layout, options)
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layout ? _render_content_with_layout(text, layout, options[:locals]) : text
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end
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2009-08-06 22:43:28 +00:00
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def render_template(*args)
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2009-05-12 23:21:34 +00:00
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@assigns_added = nil
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_render_template_with_layout(*args)
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end
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2009-01-22 22:18:10 +00:00
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def _render_template_with_layout(template, layout = nil, options = {}, partial = false)
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2009-06-18 01:08:45 +00:00
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logger && logger.info("Rendering #{template.identifier}#{' (#{options[:status]})' if options[:status]}")
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locals = options[:locals] || {}
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2009-01-22 22:18:10 +00:00
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content = if partial
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object = partial unless partial == true
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_render_partial_object(template, options, object)
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else
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2009-06-18 01:08:45 +00:00
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_render_template(template, locals)
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2009-01-22 22:18:10 +00:00
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end
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2009-06-18 01:08:45 +00:00
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layout ? _render_content_with_layout(content, layout, locals) : content
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2009-01-22 22:18:10 +00:00
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end
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end
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end
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