require 'active_support/core_ext/object/try' module ActionView class TemplateRenderer < AbstractRenderer #:nodoc: def render(context, options) @view = context @details = extract_details(options) template = determine_template(options) prepend_formats(template.formats) @lookup_context.rendered_format ||= (template.formats.first || formats.first) render_template(template, options[:layout], options[:locals]) end private # Determine the template to be rendered using the given options. def determine_template(options) keys = options.has_key?(:locals) ? options[:locals].keys : [] if options.key?(:body) Template::Text.new(options[:body]) elsif options.key?(:text) Template::Text.new(options[:text], formats.first) elsif options.key?(:plain) Template::Text.new(options[:plain]) elsif options.key?(:html) Template::HTML.new(options[:html], formats.first) elsif options.key?(:file) with_fallbacks { find_file(options[:file], nil, false, keys, @details) } elsif options.key?(:inline) handler = Template.handler_for_extension(options[:type] || "erb") Template.new(options[:inline], "inline template", handler, :locals => keys) elsif options.key?(:template) if options[:template].respond_to?(:render) options[:template] else find_template(options[:template], options[:prefixes], false, keys, @details) end else raise ArgumentError, "You invoked render but did not give any of :partial, :template, :inline, :file, :plain, :html, :text or :body option." end end # Renders the given template. A string representing the layout can be # supplied as well. def render_template(template, layout_name = nil, locals = nil) #:nodoc: view, locals = @view, locals || {} render_with_layout(layout_name, locals) do |layout| instrument(:template, :identifier => template.identifier, :layout => layout.try(:virtual_path)) do template.render(view, locals) { |*name| view._layout_for(*name) } end end end def render_with_layout(path, locals) #:nodoc: layout = path && find_layout(path, locals.keys, [formats.first]) content = yield(layout) if layout view = @view view.view_flow.set(:layout, content) layout.render(view, locals){ |*name| view._layout_for(*name) } else content end end # This is the method which actually finds the layout using details in the lookup # context object. If no layout is found, it checks if at least a layout with # the given name exists across all details before raising the error. def find_layout(layout, keys, formats) resolve_layout(layout, keys, formats) end def resolve_layout(layout, keys, formats) details = @details.dup details[:formats] = formats case layout when String begin if layout =~ /^\// with_fallbacks { find_template(layout, nil, false, [], details) } else find_template(layout, nil, false, [], details) end rescue ActionView::MissingTemplate all_details = @details.merge(:formats => @lookup_context.default_formats) raise unless template_exists?(layout, nil, false, [], all_details) end when Proc resolve_layout(layout.call(formats), keys, formats) else layout end end end end