Check for double render errors and set the content_type after rendering.
--

# => 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
render "posts/new", status: 422

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

# => renders "

Hello, World!

" with the default layout
render inline: "

Hello, World!

", layout: true

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

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

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

# => renders "

Hello, World!

"
render inline: "

Hello, <%= name %>!

", locals: { name: "World" }

: Hash of local variable assignments for the template.
`:locals`

# => renders "

Hello, World!

"
render inline: "

Hello, <%= @name %>!

", assigns: { name: "World" }

: Hash of instance variable assignments for the template.
`:assigns`

#### Options

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


# => renders "

Hello, World

"
render renderable: Greeting.new

default.
renderable if it responds to `format`, falling back to `text/html` by
context. The response format is determined by calling `format` on the
: Renders the provided object by calling `render_in` with the current view
`:renderable`

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

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

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

Hello, World!

"

# => renders "

Hello, World!

"
render html: "

Hello, World!

".html_safe

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

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

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

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

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

# => renders "

Hello, World!

"
render inline: "

Hello, <%= @name %>!

"
@name = "World"

: Renders an ERB template string.
`:inline`

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

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

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

: See ActionView::PartialRenderer for details.
`:partial`

#### Rendering Mode

# => "

Hello, World

"
render(renderable: Greeting.new)

# => "

Hello, World

"
render(Greeting.new)

end
end
:html
def format

end
view_context.render html: "

Hello, World

"
def render_in(view_context)
class Greeting

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

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

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

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

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

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