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) context = @lookup_context unless context.rendered_format context.formats = template.formats unless template.formats.empty? context.rendered_format = context.formats.first end render_template(template, options[:layout], options[:locals]) end # Determine the template to be rendered using the given options. def determine_template(options) #:nodoc: keys = options[:locals].try(:keys) || [] if options.key?(:text) Template::Text.new(options[:text], formats.try(:first)) elsif options.key?(:file) with_fallbacks { find_template(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) options[:template].respond_to?(:render) ? options[:template] : find_template(options[:template], options[:prefixes], false, keys, @details) else raise ArgumentError, "You invoked render but did not give any of :partial, :template, :inline, :file or :text option." end end # Renders the given template. An string representing the layout can be # supplied as well. def render_template(template, layout_name = nil, locals = {}) #: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) 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) with_layout_format { resolve_layout(layout, keys) } end def resolve_layout(layout, keys) case layout when String begin if layout =~ /^\// with_fallbacks { find_template(layout, nil, false, keys, @details) } else find_template(layout, nil, false, keys, @details) end rescue ActionView::MissingTemplate all_details = @details.merge(:formats => @lookup_context.default_formats) raise unless template_exists?(layout, nil, false, keys, all_details) end when Proc resolve_layout(layout.call, keys) when FalseClass nil else layout end end end end