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Page 1: Metaprograming rails magic

Behind Rails Magic@hieuk09 - TINYpulse

Page 2: Metaprograming rails magic

about(me)

Page 3: Metaprograming rails magic
Page 4: Metaprograming rails magic
Page 5: Metaprograming rails magic
Page 6: Metaprograming rails magic
Page 7: Metaprograming rails magic

meta-programmingis writing code

which writes code

Page 8: Metaprograming rails magic

define_method

Page 9: Metaprograming rails magic

eval

• eval

• instance_eval

• class_eval

Page 10: Metaprograming rails magic
Page 11: Metaprograming rails magic

Hooks

• const_missing

• method_missing

Page 12: Metaprograming rails magic
Page 13: Metaprograming rails magic

How rails work?

• ActiveRecord DSL

• Dynamic methods

• Autoloader

https://github.com/rails/rails/blob/master/activerecord/lib/active_record/associations/builder/association.rb
https://github.com/rails/rails/blob/master/activerecord/lib/active_record/attribute_methods/read.rb
https://github.com/rails/rails/blob/3fc0bbf008f0e935ab56559f119c9ea8250bfddd/activesupport/lib/active_support/dependencies.rb
Page 14: Metaprograming rails magic

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