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It lets you access an object's metaclass - which is also called the "singleton class" or "eigenclass." Iterators are user-definable loop structure. Control structures in Ruby are expressions, and have some value. Now it’s all in my head, though. SELECT * From DataSet1 as D1, DataSet2 as D2 WHERE D1.columnID = D2.columnID. RSpec is a mature, feature-packed testing framework, but the documentation can be difficult to navigate. Having a proper cheat sheet will make your life a ton of easier. To protect against a user trying to access or modify data that belongs to another user, it is important to specifically control actions. Back end programmers figure out the best way for an app to communicate back to the server, and decide how user data should be collected and stored. 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It complements, augments or emphasizes points brought up in the Rails security guide from rails core.. ggplot2 is the plotting package that lives within the tidyverse. Ruby MiniTest Cheat Sheet, Unit and Spec reference. This cheat sheet was created many years ago, when invoking Net::HTTP directly was common. Alternatives to Net::HTTP. YAML 1.2 Spec; Online YAML Linter (Ruby) Online YAML Parser (Python) kwalify - YAML schema validator (Ruby) YAML Syntax Examples YAML Scalars. This is a quick reference guide to common ruby on rails commands and usage. 45 Cheat Sheets tagged with Ruby. This Cheatsheet intends to provide quick basic Ruby on Rails security tips for developers. DRAFT: Ruby Programming Cheat Sheet. The 'g' is mostly silent. Syntax. Ruby has the loop abstraction feature called iterators. YAML Cheat Sheet Edit Cheat Sheet Links. 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