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The validation of the input data is a very common problem that we face almost every day. The correct and expected input is very important in order to achieve proper and expected execution flow.
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Dry-validation Basics

Every program receives some kind of input data. It can by anything - from variables, command line options, HTML web forms, and configuration files to binary data. All of this needs to be checked to prevent unexpected errors from happening. Although ActiveModel::Validations is great for web apps and simple models, it isn't very flexible for other types of validation and complex dependencies.
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Netguru Codestories | Validations