TIL, 2018-02-27, Objects on Rails.

Musings

• Capitalization after colons.
  • Do not capitalize if only one sentence follows the colon.
  • Capitalize if more than one sentence follows the colon.
  • Do not capitalize the first word of a list after a colon.

Musings, Rails

• I think that you should really think of Rails apps as “Can this exist without Rails around it?”. It makes things easier re: how you write your app.
• Although we are used to Rails’s convention over configuration, there has to be some missing pieces.
• Reading Objects on Rails.
  • Choosing appropriate domain language for program elements often means we don’t need to rename as many things as we add more features down the road.
  • Structuring objects in trees.
    • Control access based on authorization.
    • Pre-load child objects with a reference back to their parent.
    • Save a reference to the child object in the parent.
  • Stubbing out modules: a way to insert ActiveModel into the tests if it is loaded already, but use the existing one if it is loaded already.

def stub_module(full_name)
  # If you do ActiveModel::Naming,
  # You create a module ActiveModel, then you create a module ActiveModel::Naming
  full_name.to_s.split(/::/).inject(Object) do |context
    begin
      context.const_get(name)
    rescue NameError
      context.const_set(name, Module.new)
    end
  end
end

• On the backlash vs Dependency injection: It’s just a way to pass an object’s collaborators in from the outside.

• Logic in views is almost always bad news.

• Structuring apps:
  • Cache layer via Redis.
  • Backing store that is triggered by a job.
  • Orchestrator to figure out how data is going to persist.
  • Presenter to command line application.

Musings, Elixir/Phoenix

• JWT bug: Right, just a config file!
• Phoenix slim:

= if ...
else # Yes, no anything...
  h4 You're logged in boys

• An = else would lead to 100% CPU usage.
• mix phoenix.gen.model, but mix phx.gen.html.
• Watched Chris’s Lonestar Elixir talk re: the models directory slowly becoming a dumping ground. I love how deliberate he is re: extracting things.
• The Phoenix generators are just a way to help people to learn “where to put things”. (As they should!)
• when byte_size(value) >