class RuboCop::Cop::Rails::Blank

This cops checks for code that can be changed to `blank?`. Settings:

NilOrEmpty: Convert checks for `nil` or `empty?` to `blank?`
NotPresent: Convert usages of not `present?` to `blank?`
UnlessPresent: Convert usages of `unless` `present?` to `blank?`

@example

# NilOrEmpty: true
  # bad
  foo.nil? || foo.empty?
  foo == nil || foo.empty?

  # good
  foo.blank?

# NotPresent: true
  # bad
  !foo.present?

  # good
  foo.blank?

# UnlessPresent: true
  # bad
  something unless foo.present?
  unless foo.present?
    something
  end

  # good
  something if foo.blank?
  if foo.blank?
    something
  end

Constants

MSG_NIL_OR_EMPTY
MSG_NOT_PRESENT
MSG_UNLESS_PRESENT

Public Instance Methods

autocorrect(node) click to toggle source
# File lib/rubocop/cop/rails/blank.rb, line 108
def autocorrect(node)
  lambda do |corrector|
    method_call, variable1 = unless_present?(node)

    if method_call
      corrector.replace(node.loc.keyword, 'if')
      range = method_call.loc.expression
    else
      variable1, _variable2 = nil_or_empty?(node) || not_present?(node)
      range = node.loc.expression
    end

    corrector.replace(range, replacement(variable1))
  end
end
on_if(node) click to toggle source
# File lib/rubocop/cop/rails/blank.rb, line 93
def on_if(node)
  return unless cop_config['UnlessPresent']
  return unless node.unless?

  unless_present?(node) do |method_call, receiver|
    range = unless_condition(node, method_call)

    add_offense(node,
                location: range,
                message: format(MSG_UNLESS_PRESENT,
                                replacement(receiver),
                                range.source))
  end
end
on_or(node) click to toggle source
# File lib/rubocop/cop/rails/blank.rb, line 80
def on_or(node)
  return unless cop_config['NilOrEmpty']

  nil_or_empty?(node) do |variable1, variable2|
    return unless variable1 == variable2

    add_offense(node,
                message: format(MSG_NIL_OR_EMPTY,
                                replacement(variable1),
                                node.source))
  end
end
on_send(node) click to toggle source
# File lib/rubocop/cop/rails/blank.rb, line 69
def on_send(node)
  return unless cop_config['NotPresent']

  not_present?(node) do |receiver|
    add_offense(node,
                message: format(MSG_NOT_PRESENT,
                                replacement(receiver),
                                node.source))
  end
end

Private Instance Methods

replacement(node) click to toggle source
# File lib/rubocop/cop/rails/blank.rb, line 134
def replacement(node)
  node.respond_to?(:source) ? "#{node.source}.blank?" : 'blank?'
end
unless_condition(node, method_call) click to toggle source
# File lib/rubocop/cop/rails/blank.rb, line 126
def unless_condition(node, method_call)
  if node.modifier_form?
    node.loc.keyword.join(node.loc.expression.end)
  else
    node.loc.expression.begin.join(method_call.loc.expression)
  end
end