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Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias

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Rich Hickey
https://confreaks.tv/videos/railsconf2012-keynote-simplicity-matters
https://confreaks.tv/videos/jaxconf2012-keynote-the-value-of-values

Dave Thomas
https://confreaks.tv/videos/elixirconf2014-opening-keynote-think-different
https://confreaks.tv/videos/lonestarruby2013-elixir-power-of-erlang-joy-of-ruby

Robert Martin
https://confreaks.tv/videos/rubymidwest2011-keynote-architecture-the-lost-years

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Rails 7 new features. Before and After

• Add ComparisonValidator
• PostgreSQL generated columns
• PostgreSQL custom enum types
• Add tracking of belongs_to association
• association_previously_changed? method
• Add invert_where method
• Add associated method
• Add missing method
• Active Record Encryption

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# In most cases, a single Rails app will be attached to a single repo

# As of Rails 5.1, initializing a new project will also automatically initialize Git

# This is perfect in most circumstances, but at App Academy, students have homework and 
# project repos that contain multiple rails apps inside them

# To account for this without pushing the submodules, students need to remove the .git
# directory before adding and commiting the new project, but most do not, resulting in

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module Arel::Predications
  def has_key(right)
    Arel::Nodes::HasKey.new(self, quoted_node(right))
  end
end

class Arel::Nodes::HasKey < Arel::Nodes::Binary
  def operator; :"?" end
end

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module Arel::Predications
  def any(right)
    Arel::Nodes::Any.new(self, quoted_node(right))
  end
end

class Arel::Nodes::Any < Arel::Nodes::Binary
  def operator
    :'ANY'
  end

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People

:bowtie:	😄 :smile:	😆 :laughing:
😊 :blush:	😃 :smiley:	☺️ :relaxed:
😏 :smirk:	😍 :heart_eyes:	😘 :kissing_heart:
😚 :kissing_closed_eyes:	😳 :flushed:	😌 :relieved:
😆 :satisfied:	😁 :grin:	😉 :wink:
😜 :stuck_out_tongue_winking_eye:	😝 :stuck_out_tongue_closed_eyes:	😀 :grinning:
😗 :kissing:	😙 :kissing_smiling_eyes:	😛 :stuck_out_tongue:

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Pull Request Description

This PR aims to do something (detailed description).

Type (Feature, Fix, Config, etc)

• Bug fix 🐞
• New feature ✨
• Breaking change 🔩
• This change requires a documentation update 📙