How can I implement form validation in a Rails application?

How can I implement form validation in a Rails application?

You can use Active Record validations in your Rails models. For example, you can add validates :name, presence: true to ensure the name field is filled.

What are some common validation methods I can use?

Common validation methods include validates_presence_of, validates_uniqueness_of, and validates_length_of. Each serves a different purpose.

Can I create custom validation methods?

Yes, you can create custom validation methods by defining a method in your model and using validate :your_method_name.

How do I display validation errors in the form?

You can display validation errors in your form by using @model.errors.full_messages to show the error messages.