How to get error data when validating fields in a Rails model?

Question

Ruby on Rails

I'm not saving in the model.
It doesn't show any errors, something doesn't work when saving.
How, through the console or somehow, to find out the errors that are obtained there?

Answer 1

The model you are saving has an errors method which contains an array of validation errors

class Person < ActiveRecord::Base
  validates :name, presence: true, length: { minimum: 3 }
end
 
person = Person.new
person.valid? # => false
person.errors.messages
 # => {:name=>["can't be blank", "is too short (minimum is 3 characters)"]}
 
person = Person.new(name: "John Doe")
person.valid? # => true
person.errors.messages # => {}

The documentation describes this in detail: Active Record Validations