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In Rails, layouts are pieces that fit together (for example header, footer, menus, etc) to make a complete view. An application may have as many layouts as you want. Rails use convention over configuration to automatically pair up layouts with respective controllers having same name.
Rails provides us great functionality for managing layouts in a web application. The layouts removes code duplication in view layer. You are able to slice all your application pages to blocks such as header, footer, sidebar, body and etc.
By default, if you use the :text option, the text is rendered without using the current layout. If you want Rails to put the text into the current layout, you need to add the layout: true option.
A partial allows you to separate layout code out into a file which will be reused throughout the layout and/or multiple other layouts. For example, you might have a login form that you want to display on 10 different pages on your site.
You can use a method to set the layout.
class MyController < ApplicationController
layout :resolve_layout
# ...
private
def resolve_layout
case action_name
when "new", "create"
"some_layout"
when "index"
"other_layout"
else
"application"
end
end
end
If you are only selecting between two layouts, you can use :only:
class ProductsController < ApplicationController
layout "admin", only: [:new, :edit]
end
or
class ProductsController < ApplicationController
layout "application", only: [:index]
end
You can specify the layout for an individual action using respond_to:
def foo
@model = Bar.first
respond_to do |format|
format.html {render :layout => 'application'}
end
end
You can also specify the layout for action using render:
def foo
render layout: "application"
end
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