class RuboCop::Cop::Rails::PluralizationGrammar

This cop checks for correct grammar when using ActiveSupport's core extensions to the numeric classes.

@example

# bad
3.day.ago
1.months.ago

# good
3.days.ago
1.month.ago

Constants

MSG
PLURAL_DURATION_METHODS
SINGULAR_DURATION_METHODS

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 31
def on_send(node)
  receiver, method_name, *_args = *node
  return if receiver.nil?
  return unless duration_method?(method_name)
  return unless literal_number?(receiver)
  number, = *receiver
  if singular_receiver?(number) && plural_method?(method_name)
    add_offense(node,
                :expression,
                format(MSG, number, singularize(method_name)))
  elsif plural_receiver?(number) && singular_method?(method_name)
    add_offense(node,
                :expression,
                format(MSG, number, pluralize(method_name)))
  end
end

Private Instance Methods

autocorrect(node) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 50
def autocorrect(node)
  lambda do |corrector|
    method_name = node.loc.selector.source
    replacement = if plural_method?(method_name)
                    singularize(method_name)
                  else
                    pluralize(method_name)
                  end
    corrector.replace(node.loc.selector, replacement)
  end
end
duration_method?(method_name) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 90
def duration_method?(method_name)
  SINGULAR_DURATION_METHODS.key?(method_name) ||
    PLURAL_DURATION_METHODS.key?(method_name)
end
literal_number?(node) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 78
def literal_number?(node)
  node.int_type? || node.float_type?
end
plural_method?(method_name) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 62
def plural_method?(method_name)
  method_name.to_s.end_with?('s')
end
plural_receiver?(number) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 74
def plural_receiver?(number)
  !singular_receiver?(number)
end
pluralize(method_name) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 82
def pluralize(method_name)
  SINGULAR_DURATION_METHODS.fetch(method_name.to_sym).to_s
end
singular_method?(method_name) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 66
def singular_method?(method_name)
  !plural_method?(method_name)
end
singular_receiver?(number) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 70
def singular_receiver?(number)
  number == 1
end
singularize(method_name) click to toggle source
# File lib/rubocop/cop/rails/pluralization_grammar.rb, line 86
def singularize(method_name)
  PLURAL_DURATION_METHODS.fetch(method_name.to_sym).to_s
end