factory_girl.rb

#test, fixtures, tweets.yml

#You can create seed data very quickly; 

gem 'factory-girl-rails'

#Going to create a factory that makes twweets

#In test folder create factories.rb
#In here we will have a tamplate for creating a user; 

Go into the rails console

FactoryGirl.create(:user)
100.times do FactoryGirl.create_user end 

FactoryGirl.create_list

factory :tweet do |f|
  f.post
end

FactoryGirl.create(:tweet) #Factory girl not good at creating sample data; #You have to use Faker and Machinist; 

gem install faker

Faker::Name.name => 'Alex Higgins'

FactoryGirl.create_user .with_tweets

FactoryGirl.create_list `:user_with_tweets 500