Add seed data based on data in text file.
user
```ruby

city_models = {}
county_models = {}
state_models = {}

f = File.new(File.dirname(__FILE__) + '/../db/seeds.rb')
f.each do |line|
  
  fields = line.split(/\|\|/)
  next if fields.size != 6
  
  postal_code, latitude, longitude, state, city, count = fields
  
  state_model = state_models[state]
  if state_model.nil? 
    state_model = State.create(:name => state)
    states[state] = state_model
  end
  
  county_models_key = [county, state_model.id]
  county_model = county_models[county_models_key]
  if county_model.nil?
    county_model = County.create(:name => county, :state_id => state_model.id)
    county_models[county_models_key] = county_model
  end

  city_models_key = [city, county_model.id, state_model.id]
  city_model = city_models[city_models_key]
  if city_model.nil?
    city_model = City.create(:name => city, :county_id => county_model.id, :state_id => state_model.id)
    city_models[city_models_key]
  end

  PostalCode.create(:code => postal_code, :city_id => city_model.id, :county_id => county_model.id, :state_id => state_model.id, :latitude => latitude, :longitude => longtiude)
end```
assistant