require 'active_support/core_ext/object/try'
module ActionView
module Rendering
# Returns the result of a render that's dictated by the options hash. The primary options are:
#
# * :partial - See ActionView::Partials.
# * :update - Calls update_page with the block given.
# * :file - Renders an explicit template file (this used to be the old default), add :locals to pass in those.
# * :inline - Renders an inline template similar to how it's done in the controller.
# * :text - Renders the text passed in out.
#
# If no options hash is passed or :update specified, the default is to render a partial and use the second parameter
# as the locals hash.
def render(options = {}, locals = {}, &block) #:nodoc:
case options
when Hash
layout = options[:layout]
options[:locals] ||= {}
if block_given?
return safe_concat(_render_partial(options.merge(:partial => layout), &block))
elsif options.key?(:partial)
return _render_partial(options)
end
template = if options[:file]
find(options[:file], {:formats => formats})
elsif options[:inline]
handler = Template.handler_class_for_extension(options[:type] || "erb")
Template.new(options[:inline], "inline template", handler, {})
elsif options[:text]
Template::Text.new(options[:text])
end
if template
layout = find(layout, {:formats => formats}) if layout
_render_template(template, layout, :locals => options[:locals])
end
when :update
update_page(&block)
else
_render_partial(:partial => options, :locals => locals)
end
end
# You can think of a layout as a method that is called with a block. _layout_for
# returns the contents that are yielded to the layout. If the user calls yield
# :some_name, the block, by default, returns content_for(:some_name). If the user
# calls yield, the default block returns content_for(:layout).
#
# The user can override this default by passing a block to the layout.
#
# ==== Example
#
# # The template
# <% render :layout => "my_layout" do %>Content<% end %>
#
# # The layout
# <% yield %>
#
# In this case, instead of the default block, which would return content_for(:layout),
# this method returns the block that was passed in to render layout, and the response
# would be Content.
#
# Finally, the block can take block arguments, which can be passed in by yield.
#
# ==== Example
#
# # The template
# <% render :layout => "my_layout" do |customer| %>Hello <%= customer.name %><% end %>
#
# # The layout
# <% yield Struct.new(:name).new("David") %>
#
# In this case, the layout would receive the block passed into render :layout,
# and the Struct specified in the layout would be passed into the block. The result
# would be Hello David.
def _layout_for(name = nil, &block)
return @_content_for[name || :layout] if !block_given? || name
capture(&block)
end
# This is the API to render a ViewContext's template from a controller.
#
# Internal Options:
# _template:: The Template object to render
# _layout:: The layout, if any, to wrap the Template in
def render_template(options)
_evaluate_assigns_and_ivars
template, layout = options.values_at(:_template, :_layout)
_render_template(template, layout, options)
end
def _render_template(template, layout = nil, options = {})
locals = options[:locals] || {}
ActiveSupport::Notifications.instrument("action_view.render_template",
:identifier => template.identifier, :layout => layout.try(:identifier)) do
content = template.render(self, locals)
@_content_for[:layout] = content
if layout
@_layout = layout.identifier
content = _render_layout(layout, locals)
end
content
end
end
def _render_layout(layout, locals, &block)
layout.render(self, locals){ |*name| _layout_for(*name, &block) }
end
end
end