report_spike_current.rb

# The original method
def create_report_identifier
  field = Field.find(self.field_id)
  field_name = field.field_name
  report_date = self.date.to_s
  self.report_identifier_id = field_name << ' ' << report_date
end

# the decoupled version 
# law of demeter
def field_name
  field = self.field
  field.field_name
end

def create_identifier
  self.report_identifier_id = self.field_name + " " + self.date.to_s
end