TIL, 2017-04-07, Where Um

• Multiple email addresses for the same account–um why?
• validate_false: Allows you to do a create(:user, :validate_false) (create a user but skip validations) Reference

FactoryGirl.define do
  factory :user do
    email { Faker::Internet.email }

    trait :validate_false do
      to_create { |instance| instance.save(validate: false) }
    end
  end
end

The Elements of Style in Ruby #13: Length vs Size vs Count

Reference

• Good idea: size for collections and length for strings, since hashes and stacks don’t have a length but a size.
• count can be invoked with a block or argument.

arr = [1, 1, 2, 3, 5, 6, 8]

arr.count(&:even?) # => 3
arr.count(1) # => 2

• AR::Relation count will perform a count query, length will load up the records, and size will do the smart thing based on whether it is loaded.
• Set or Hash are faster with length and size vs. count.