39 lines
1.2 KiB
Ruby
39 lines
1.2 KiB
Ruby
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#---
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# Excerpted from "Agile Web Development with Rails",
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# published by The Pragmatic Bookshelf.
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# Copyrights apply to this code. It may not be used to create training material,
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# courses, books, articles, and the like. Contact us if you are in doubt.
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# We make no guarantees that this code is fit for any purpose.
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# Visit http://www.pragmaticprogrammer.com/titles/rails4 for more book information.
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#---
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class Product < ActiveRecord::Base
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has_many :line_items
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has_many :orders, through: :line_items
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#...
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before_destroy :ensure_not_referenced_by_any_line_item
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validates :title, :description, :image_url, presence: true
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validates :price, numericality: {greater_than_or_equal_to: 0.01}
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#
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validates :title, uniqueness: true
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validates :image_url, allow_blank: true, format: {
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with: %r{\.(gif|jpg|png)$}i,
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message: 'must be a URL for GIF, JPG or PNG image.'
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}
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validates :title, length: {minimum: 10}
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def self.latest
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Product.order('updated_at desc').limit(1).first
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end
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private
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# ensure that there are no line items referencing this product
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def ensure_not_referenced_by_any_line_item
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if line_items.empty?
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return true
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else
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errors.add(:base, 'Line Items present')
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return false
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end
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end
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end
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