app/models/feedback.rb
class Feedback
include Mongoid::Document
include Mongoid::Slug
field :name, type: String
field :email, type: String
field :country, type: String
field :text, type: String
slug :name
validates :name, :email, :text, presence: true
validates_format_of :email, with: Devise.email_regexp, message: "Invalid email format"
end