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class Media < ActiveRecord::Base
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belongs_to :operatingsystem
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has_many :hosts
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validates_uniqueness_of :name, :scope => :operatingsystem_id
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validates_uniqueness_of :path, :scope => :operatingsystem_id
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validates_presence_of :name, :path
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validates_format_of :name, :with => /\A(\S+\s?)+\Z/, :message => "can't be blank or contain trailing white spaces."
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validates_format_of :path, :with => /^((http|ftp):\/\/)|\w+:\/\w+$/,
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:message => "Url (http:// or ftp://) or a NFS share area allowed (e.g. server:/vol/dir)"
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alias_attribute :os, :operatingsystem
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before_destroy :ensure_not_used
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end
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