What are some examples of validations in Ruby on Rails?

What are some examples of validations in Ruby on Rails?

In Ruby on Rails, validations are used to ensure that only valid data is saved to the database. For example, you can use validates :name, presence: true to ensure that the name field is not empty.

Can you give me more examples of different types of validations?

Sure! Here are a few more examples: validates :email, presence: true, uniqueness: true ensures the email is unique and not empty. validates :age, numericality: { only_integer: true, greater_than: 0 } ensures age is a positive integer.

How do I create a custom validation?

To create a custom validation, you can define a method in your model and use validate :method_name. For example, validate :check_age where check_age is your custom method that contains the validation logic.

What happens if a validation fails?

If a validation fails, the record will not be saved to the database, and the errors will be added to the model's errors collection, which you can display to the user.