TIL, 2017-07-31

Rails where–optimistically finds, if can’t, it will return an empty or will just return what it found, without an error.
You can do reload with a lock?
No implicit conversion of Symbol to Integer–just a missing hash key?
No to polymorphic association–SQL Anti-pattern, since no freaking way to do the foreign key association.
Creating a join table:
- Add foreign key
- Add index to both tables being joined
- Add unique index
shared_examples
Date.current.beginning_of_week
Railties–used to hook onto Rails.
You can fiddle around the request.variant (variant is just a created attribute of request via ActionPack–subclass ApplicationController and check the request.user_agent. Reference