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class Media < ActiveRecord::Base
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has_and_belongs_to_many :operatingsystems
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has_many :hosts
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validates_uniqueness_of :name
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validates_uniqueness_of :path
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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|https|ftp|nfs):\/\//,
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:message => "Only URLs with schema http://, https://, ftp:// or nfs:// are allowed (e.g. nfs://server/vol/dir)"
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alias_attribute :os, :operatingsystem
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before_destroy Ensure_not_used_by.new(:hosts)
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def as_json(options={})
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super({:only => [:name, :id]}.merge(options))
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end
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end
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