job_media.rb
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	# Bacula JobMedia table.
	#
	# The JobMedia table contains one entry at the following:
	#
	# * start of the job,
	# * start of each new tape file,
	# * start of each new tape,
	# * end of the job.
	#
	# Since by default, a new tape file is written every 2GB, in general, you will have more
	# than 2 JobMedia records per Job.
	# The number can be varied by changing the "Maximum File Size" specified in the Device resource.
	# This record allows Bacula to efficiently position close to (within 2GB) any given file in a backup.
	# For restoring a full Job, these records are not very important, but if you want to retrieve a
	# single file that was written near the end of a 100GB backup, the JobMedia records can speed it
	# up by orders of magnitude by permitting forward spacing files and blocks rather than reading
	# the whole 100GB backup.
	class JobMedia < ActiveRecord::Base
	self.table_name = :JobMedia
	self.primary_key = :JobMediaId

	alias_attribute :job_media_id, :JobMediaId
	alias_attribute :job_id, :JobId
	alias_attribute :media_id, :MediaId
	alias_attribute :first_index, :FirstIndex
	alias_attribute :last_index, :LastIndex
	alias_attribute :start_file, :StartFile
	alias_attribute :end_file, :EndFile
	alias_attribute :start_block, :StartBlock
	alias_attribute :end_block, :EndBlock
	alias_attribute :vol_index, :VolIndex

	belongs_to :Job, foreign_key: :JobId
	belongs_to :Media, foreign_key: :MediaId
	end