Task B

Model !

validates :title, :description, :image_url, presence: true
validates :price, numericality: {greater_than_or_equal_to: 0.01}
validates :title, uniqueness: true
validates :image_url, allow_blank: true, format: { with:
%r{\.(gif|jpg|png)\Z}i,
message: 'must be a URL for GIF, JPG or PNG image.'
}