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)
  _receiver, method_name, _body = *node
  case 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)
  _receiver, method_name, *_args = *node
  if method_name == :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)
  read_write_attribute?(node) do
    add_offense(node, :selector)
  end
end

def read_attribute_replacement(node) 

def read_attribute_replacement(node)
  _receiver, _method_name, body = *node
  "self[#{body.source}]"
end

def write_attribute_replacement(node) 

def write_attribute_replacement(node)
  _receiver, _method_name, *args = *node
  name, value = *args
  "self[#{name.source}] = #{value.source}"
end