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class ArtworkSize < ActiveRecord::Base
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has_many :artworks, :order => "title ASC"
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validates_presence_of :height, :width
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validates_acceptance_of :height, :if => Proc.new {|artwork_size| artwork_size.height <= 0 }, :message => _("must be a positive non-zero number")
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validates_acceptance_of :width, :if => Proc.new {|artwork_size| artwork_size.width <= 0 }, :message => _("must be a positive non-zero number")
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validates_uniqueness_of :width, :scope => [:height], :message => _("is invalid, because this (height, width) couple already exist")
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def human_size
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"#{height} x #{width} mm"
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end
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end
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