class RuboCop::Cop::Rails::ReadWriteAttribute

self = val
x = self[:attr]
# good
write_attribute(:attr, val)
x = read_attribute(:attr)
# bad
@example
write_attribute methods.
This cop checks for the use of the read_attribute or

def autocorrect(node) 

def autocorrect(node)
  case node.method_name
  when :read_attribute
    replacement = read_attribute_replacement(node)
  when :write_attribute
    replacement = write_attribute_replacement(node)
  end
  ->(corrector) { corrector.replace(node.source_range, replacement) }
end

def message(node) 

def message(node)
  if node.method?(:read_attribute)
    format(MSG, 'self[:attr]', 'read_attribute(:attr)')
  else
    format(MSG, 'self[:attr] = val', 'write_attribute(:attr, val)')
  end
end

def on_send(node) 

def on_send(node)
  return unless read_write_attribute?(node)
  add_offense(node, :selector)
end

def read_attribute_replacement(node) 

def read_attribute_replacement(node)
  "self[#{node.first_argument.source}]"
end

def write_attribute_replacement(node) 

def write_attribute_replacement(node)
  "self[#{node.first_argument.source}] = #{node.last_argument.source}"
end