class RubbyCop::Cop::Rails::SafeNavigation

This cop converts usages of `try!` to `&.`. It can also be configured to convert `try`. It will convert code to use safe navigation if the target Ruby version is set to 2.3+

@example

# ConvertTry: false
  # bad
  foo.try!(:bar)
  foo.try!(:bar, baz)
  foo.try!(:bar) { |e| e.baz }

  foo.try!(:[], 0)

  # good
  foo.try(:bar)
  foo.try(:bar, baz)
  foo.try(:bar) { |e| e.baz }

  foo&.bar
  foo&.bar(baz)
  foo&.bar { |e| e.baz }

# ConvertTry: true
  # bad
  foo.try!(:bar)
  foo.try!(:bar, baz)
  foo.try!(:bar) { |e| e.baz }
  foo.try(:bar)
  foo.try(:bar, baz)
  foo.try(:bar) { |e| e.baz }

  # good
  foo&.bar
  foo&.bar(baz)
  foo&.bar { |e| e.baz }

Constants

MSG

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubbycop/cop/rails/safe_navigation.rb, line 53
def on_send(node)
  try_call(node) do |try_method, method_to_try|
    return if try_method == :try && !cop_config['ConvertTry']
    return unless method_to_try.sym_type?
    method, = *method_to_try
    return unless method =~ /\w+[=!?]?/
    add_offense(node, :expression, format(MSG, try_method))
  end
end

Private Instance Methods

autocorrect(node) click to toggle source
# File lib/rubbycop/cop/rails/safe_navigation.rb, line 65
def autocorrect(node)
  method_node, *params = *node.arguments
  method = method_node.source[1..-1]

  range = range_between(node.loc.dot.begin_pos,
                        node.loc.expression.end_pos)

  lambda do |corrector|
    corrector.replace(range, replacement(method, params))
  end
end
replacement(method, params) click to toggle source
# File lib/rubbycop/cop/rails/safe_navigation.rb, line 77
def replacement(method, params)
  new_params = params.map(&:source).join(', ')

  if method.end_with?('=')
    "&.#{method[0...-1]} = #{new_params}"
  elsif params.empty?
    "&.#{method}"
  else
    "&.#{method}(#{new_params})"
  end
end