class RailsBestPractices::Reviews::IsolateSeedDataReview

then it should be isolated to db seed.
and the receiver is included in new variables,
if the message is “save” or “save!”,
then it should be isolated to db seed.
if the message is “create” or “create!”,
2. check all call nodes,
then remember their left value as new variables.
if the right value is a call node with message “new”,
1. check all assignment nodes,
Review process:
Implementation:
See the best practice details here rails-bestpractices.com/posts/2010/07/24/isolating-seed-data/
Make sure not to insert data in migration, move them to seed file.

def initialize(options = {}) 

def initialize(options = {})
  super(options)
  @new_variables = []
end

def new_record?(node)

see if the receiver of the call node is included in the @new_varaibles. 
def new_record?(node)
  @new_variables.include? node.receiver.to_s
end

def remember_new_variable(node)

then remember the left value as new variable.
if the right vavlue is a method_add_arg node with message "new",
check assignment node, 
def remember_new_variable(node)
  right_value = node.right_value
  if right_value.sexp_type == :method_add_arg && right_value.message.to_s == 'new'
    @new_variables << node.left_value.to_s
  end
end