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Name custom validation methods with prefix 'validate_' · Issue #223 · rubocop/rails-style-guide · GitHub
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A quick look at Rails Custom Validation
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Custom validation message for numericality does not work · Issue #34478 · rails/rails · GitHub
Validation Context Behaviour Cheat Sheet (Rails 4)
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Ruby on Rails Guides: Active Record Validations and Callbacks
forms - Validate that an end_date is later than a start_date in Rails 4 - Stack Overflow
