naw

For overall terminology for event-driven, even-sourcing, CQRS, etc. to help disambiguate by Martin Fowler:

• https://www.youtube.com/watch?v=STKCRSUsyP0 video OR https://martinfowler.com/articles/201701-event-driven.html article

At least a couple of videos by Greg Evans. He's given the same basic talks multiple times, so no need to watch every single variation, but here are a few distinct ones:

• Event sourcing and CQRS: https://www.youtube.com/watch?v=JHGkaShoyNs
• Polyglot Data, Accidental complexity, i.e. "read models": https://www.youtube.com/watch?v=hv2dKtPq0ME Section starting at 24:55 has good rationale for why event sourcing is more than just having a relational DB with an event bus or stream to share data with other DBs.
• Lessons learned: https://www.youtube.com/watch?v=LDW0QWie21s

naw

# This is not a bug report
#
# The purpose of this file is to illustrate
# differences in how Rails treats assignment
# to a nested_attributes setter vs. assignment
# to a collection directly.
#
# In the former, existing records are _not_ deleted if they are not present in the assigned data.
# In the latter, existing records _are_ deleted if they are not present in the assigned data.

naw

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

naw

def original
  click_link "Load something" # Runs AJAX
  expect(page).to have_content('Something')
end

def bad
  click_link "Load something" # Runs AJAX
  save_and_open_page # to see why it isn't loading
  expect(page).to have_content('Something')
end