class Object

File activesupport/lib/active_support/core_ext/object/blank.rb, line 122

Public Instance Methods

blank?() click to toggle source

An object is blank if it's false, empty, or a whitespace string. For example, false, '', ' ', nil, [], and {} are all blank.

This simplifies

!address || address.empty?

to

address.blank?

@return [true, false]

# File lib/core_ext/object/blank.rb, line 15
def blank?
  respond_to?(:empty?) ? !!empty? : !self
end
presence() click to toggle source

Returns the receiver if it's present otherwise returns nil. object.presence is equivalent to

object.present? ? object : nil

For example, something like

state   = params[:state]   if params[:state].present?
country = params[:country] if params[:country].present?
region  = state || country || 'US'

becomes

region = params[:state].presence || params[:country].presence || 'US'

@return [Object]

# File lib/core_ext/object/blank.rb, line 42
def presence
  self if present?
end
present?() click to toggle source

An object is present if it's not blank.

@return [true, false]

# File lib/core_ext/object/blank.rb, line 22
def present?
  !blank?
end