TIL, 2017-04-02, assert_valid_keys

• Mass move: mv _posts/*.md _posts/programming.
• Just use update_attributes! and create! instead of update_attributes and create, if only to avoid silent failures. The update_attributes will work if you are doing a valid? later. Reference
• Another ActiveSupport gem: assert_valid_keys.
• rack-mini-profiler.

Benefits of Testing

• It is a way to document what your code does.
• Sooner or later, you will forget what your code actually did, it is like a mental reminder of why your code is like this or like that.
• It is a way to ensure sanity when trying to refactor a class. Show: Tenants::CreateService.
• It is a way to ensure that everything still works when trying to optimize something in your Rails code. Show: An example of ensuring that n+1 queries will be sped up. Reference
• It is just a good practice to do. You
• Small thing: You figure out what is memoized or not. BTW small things like this are impora

Cons

• You are like learning a new programming language.