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Active Record offers many pre-defined validation helpers that you can use directly inside your class definitions. These helpers provide common validation rules.

This method is a shortcut to all default validators and any custom validator classes ending in 'Validator'. Note that Rails default validators can be ...

2020/5/1 -These helpers are established to provide common use validations like whether a required field was entered or an entry matches the required ...

2013/8/9 -If the validation function returns true or if there is an error object, i.e. object.errors is not empty, then the object is considered valid?

2020/5/21 -Conditional validations can be used when a validation needs to be run only if a condition is satisfied. This can be implemented in many ways ...

This rule says that “the name of this project must unique, within the scope of this account”. In other words, the combination of a name and account_id must be ...

2023/2/1 -Whether you're validating individual models or associations between models, Rails makes it easy to specify and enforce your validation rules.

Adds a validation method or block to the class. This is useful when overriding the #validate instance method becomes too unwieldly and you're looking for ...

2023/11/5 -Why use validations? To ensure only valid data is saved to your database. On top of clientside validation, model-level validations provide an ...

2023/12/25 -In summary, validate is used to define custom validation methods, while validates is used to apply built-in validation rules to model attributes ...