TIL, 2017-03-06

• One of the advantages of value objects is that you can use Comparable and the <=> method.
• I WAS ABLE TO FUNCTIONAL THINGS TODAY YEAH FAST TESTS

• Arel is sometimes overkill. You can do this:

  correct_answers
  .select("match_answers.*, match_questions.point_value")
    .joins("LEFT JOIN match_questions ON match_questions.id = match_answers.match_question_id")
  .map(&:point_value).reduce(:+)
  

• Do that if you need to get something from match_questions when match_answer belongs_to :match_questions.

Rails Conf 2013 Keynote: Simplicity Matters by Rich Hickey

• Prefer the simple over the complex. Ex: keyword arguments over positional arguments.
• First iteration, is it possible to split things into system?
• The thing when that we should use to connect systems and programs are data. Use maps or hashes up front.
• You have to separate simplicity and ease, and try to figure out where there are entanglements or complecting things that you introduced.
• Do not lean on your tools, tools will not do this for you. Not all things in a language are useful.
• We need to deal with complexity. We need to keep it to a minimum.
• Simplicity enables change.