Integralist

• Dynamic Dispatch
• Dynamic Method
• Ghost Methods
• Dynamic Proxies
• Blank Slate
• Kernel Method
• Flattening the Scope (aka Nested Lexical Scopes)
• Context Probe
• Class Eval (not really a 'spell' more just a demonstration of its usage)
• Class Macros

ohthatjames

require "set"

class Proc
  def self.register_type(klass, proc)
    @types_to_convert ||= {}
    @types_to_convert[klass] = proc
  end

  def self.[](field)
    -> (x) { (@types_to_convert || {})[field.class].call(field, x) }

davidderus

.git
.gitignore
/doc
.yardoc
coverage
jsdoc
/tmp
/log
Dockerfile
Dockerfile.prod

ostinelli

# add this into application.rb
initializer_file = Rails.root.join('config', 'initializers', 'my_initializer.rb')
reloader = ActiveSupport::FileUpdateChecker.new([initializer_file]) do
  load initializer_file
end
ActiveSupport::Reloader.to_prepare do
  reloader.execute
end

mankind

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

mehdi-farsi

Has And Belongs To Many (use case)

how it works ?

Let's take the simple example of a blog with:

• A post habtm tags
• A tag habtm posts