Validations
Learn about why we use validations and how to implement them in Rails.
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If you start up the application now and create a new pet, you will notice that you can provide any input to each of the fields. You can even leave them all blank and a new pet will still be created.
You want to impose certain restrictions on what you consider a valid pet. For example, a pet must have a name, and its description must exceed a minimum character count. To impose these restrictions, we use validations.
Validations
Adding validation to model
To add validation into your application you will open the app/models/pet.rb
file and add the following lines to your Pet
model class:
validates :name, presence: true
validates :description, length: {minimum: 10}
These lines will ensure that the name
entry has a value and description
is at least 10
characters. If any of these restrictions are not met, the new pet creation will fail.
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