bundle install --binstubs --path vendor/bundle
rails generate migration CreateCategories
heroku run rake db:migrate
ruby -Itest test/functional/categories_controller_test.rb -n test_get_many
rake db:test:prepare
curl -i "http://localhost:3000/categories?ids%5b%5d=1&ids%5b%5d=3"
startDate-endDate --> filters