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Module: ActionController::Rendering

Relationships & Source Files
Namespace Children
Modules:
ClassMethods
Extension / Inclusion / Inheritance Descendants
Included In:
API, Base, DataStreaming, ::ActionView::TestCase::TestController, Rails::ApplicationController, ::Rails::HealthController, Rails::InfoController, Rails::MailersController, Rails::WelcomeController
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveSupport::Concern
Defined in: actionpack/lib/action_controller/metal/rendering.rb

Constant Summary

Class Method Summary

::ActiveSupport::Concern - Extended

class_methods

Define class methods from given block.
included

Evaluate given block in context of base class, so that you can write class macros here.
prepended

Evaluate given block in context of base class, so that you can write class macros here.

Instance Method Summary

  • #render(*args)

    Renders a template and assigns the result to self.response_body.

  • #render_to_string

    Similar to #render, but only returns the rendered template as a string, instead of setting self.response_body.

Instance Method Details

#render(*args)

Renders a template and assigns the result to self.response_body.

If no rendering mode option is specified, the template will be derived from the first argument.

render "posts/show"
# => renders app/views/posts/show.html.erb

# In a PostsController action...
render :show
# => renders app/views/posts/show.html.erb

If the first argument responds to render_in, the template will be rendered by calling render_in with the current view context.

Rendering Mode

:partial

See ActionView::PartialRenderer for details.

render partial: "posts/form", locals: { post: Post.new }
# => renders app/views/posts/_form.html.erb
:file

Renders the contents of a file. This option should not be used with unsanitized user input.

render file: "/path/to/some/file"
# => renders /path/to/some/file
:inline

Renders an ERB template string.

@name = "World"
render inline: "<h1>Hello, <%= @name %>!</h1>"
# => renders "<h1>Hello, World!</h1>"
:body

Renders the provided text, and sets the content type as text/plain.

render body: "Hello, World!"
# => renders "Hello, World!"
:plain

Renders the provided text, and sets the content type as text/plain.

render plain: "Hello, World!"
# => renders "Hello, World!"
:html

Renders the provided HTML string, and sets the content type as text/html. If the string is not html_safe?, performs HTML escaping on the string before rendering.

render html: "<h1>Hello, World!</h1>".html_safe
# => renders "<h1>Hello, World!</h1>"

render html: "<h1>Hello, World!</h1>"
# => renders "&lt;h1&gt;Hello, World!&lt;/h1&gt;"
:json

Renders the provided object as JSON, and sets the content type as application/json. If the object is not a string, it will be converted to JSON by calling to_json.

render json: { hello: "world" }
# => renders "{\"hello\":\"world\"}"

By default, when a rendering mode is specified, no layout template is rendered.

Options

:assigns

Hash of instance variable assignments for the template.

render inline: "<h1>Hello, <%= @name %>!</h1>", assigns: { name: "World" }
# => renders "<h1>Hello, World!</h1>"
:locals

Hash of local variable assignments for the template.

render inline: "<h1>Hello, <%= name %>!</h1>", locals: { name: "World" }
# => renders "<h1>Hello, World!</h1>"
:layout

The layout template to render. Can also be false or true to disable or (re)enable the default layout template.

render "posts/show", layout: "holiday"
# => renders app/views/posts/show.html.erb with the app/views/layouts/holiday.html.erb layout

render "posts/show", layout: false
# => renders app/views/posts/show.html.erb with no layout

render inline: "<h1>Hello, World!</h1>", layout: true
# => renders "<h1>Hello, World!</h1>" with the default layout
:status

The HTTP status code to send with the response. Can be specified as a number or as the status name in Symbol form. Defaults to 200.

render "posts/new", status: 422
# => renders app/views/posts/new.html.erb with HTTP status code 422

render "posts/new", status: :unprocessable_entity
# => renders app/views/posts/new.html.erb with HTTP status code 422

Raises:

[ GitHub ] 

  


# File 'actionpack/lib/action_controller/metal/rendering.rb', line 137



def render(*args)
  raise ::AbstractController::DoubleRenderError if response_body
  super
end


  








  

    #render_to_string  
  



  

    

Similar to #render, but only returns the rendered template as a string, instead of setting self.response_body.


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_controller/metal/rendering.rb', line 146



def render_to_string(*)
  result = super
  if result.respond_to?(:each)
    string = +""
    result.each { |r| string << r }
    string
  else
    result
  end
end