class RuboCop::Cop::Rails::Presence

This cop checks code that can be written more easily using `Object#presence` defined by Active Support.

@example

# bad
a.present? ? a : nil

# bad
!a.present? ? nil : a

# bad
a.blank? ? nil : a

# bad
!a.blank? ? a : nil

# good
a.presence

@example

# bad
a.present? ? a : b

# bad
!a.present? ? b : a

# bad
a.blank? ? b : a

# bad
!a.blank? ? a : b

# good
a.presence || b

Constants

MSG

Public Instance Methods

autocorrect(node) click to toggle source
# File lib/rubocop/cop/rails/presence.rb, line 89
def autocorrect(node)
  lambda do |corrector|
    redundant_receiver_and_other(node) do |receiver, other|
      corrector.replace(node.source_range, replacement(receiver, other))
    end

    redundant_negative_receiver_and_other(node) do |receiver, other|
      corrector.replace(node.source_range, replacement(receiver, other))
    end
  end
end
on_if(node) click to toggle source
# File lib/rubocop/cop/rails/presence.rb, line 73
def on_if(node)
  return if ignore_if_node?(node)

  redundant_receiver_and_other(node) do |receiver, other|
    unless ignore_other_node?(other) || receiver.nil?
      add_offense(node, message: message(node, receiver, other))
    end
  end

  redundant_negative_receiver_and_other(node) do |receiver, other|
    unless ignore_other_node?(other) || receiver.nil?
      add_offense(node, message: message(node, receiver, other))
    end
  end
end

Private Instance Methods

ignore_if_node?(node) click to toggle source
# File lib/rubocop/cop/rails/presence.rb, line 103
def ignore_if_node?(node)
  node.elsif?
end
ignore_other_node?(node) click to toggle source
# File lib/rubocop/cop/rails/presence.rb, line 107
def ignore_other_node?(node)
  node && (node.if_type? || node.rescue_type? || node.while_type?)
end
message(node, receiver, other) click to toggle source
# File lib/rubocop/cop/rails/presence.rb, line 111
def message(node, receiver, other)
  format(MSG,
         prefer: replacement(receiver, other),
         current: node.source)
end
replacement(receiver, other) click to toggle source
# File lib/rubocop/cop/rails/presence.rb, line 117
def replacement(receiver, other)
  or_source = other.nil? || other.nil_type? ? '' : " || #{other.source}"
  "#{receiver.source}.presence" + or_source
end