Validate Me! - Demystifying Rails Validators
summary
Shows that ComparisonValidator merged into Rails and that custom validators can live in app, lib, gem, or Rails itself; explains validators registered via validates/validates_with into model._validators but run later via valid/save callbacks; details options like allow_nil, allow_blank, message, if/unless, on, strict; highlights that validators live in ActiveModel not ActiveRecord so uniqueness validator has race conditions and DB constraints still require unique indexes; demonstrates how to implement validate_each.
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chapters (12)
- 0:00Rails validators intro
- 1:08Standard validator helpers
- 3:38Presence validator deep dive
- 6:22Active Model vs Active Record
- 8:51Standard library validators
- 10:59Validations and database
- 12:24How validates method works
- 14:49When validations trigger
- 16:37Purpose and limits of validations
- 18:43Custom validators in Rails
- 21:11Where to place custom validators
- 23:17Acknowledgments
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