# File actionview/lib/action_view/layouts.rb, line 267
def layout(layout, conditions = {})
  include LayoutConditions unless conditions.empty?

  conditions.each { |k, v| conditions[k] = Array(v).map(&:to_s) }
  self._layout_conditions = conditions

  self._layout = layout
  _write_layout_method
end

Specify the layout to use for this class.

If the specified layout is a:

String

the String is the template name

Symbol

call the method specified by the symbol

Proc

call the passed Proc

false

There is no layout

true

raise an ArgumentError

nil

Force default layout behavior with inheritance

Return value of Proc and Symbol arguments should be String, false, true or nil with the same meaning as described above.

Parameters

• layout - The layout to use.

Options (conditions)

• :only - A list of actions to apply this layout to.

• :except - Apply this layout to all actions but this one.