job_stats.rb
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	# Helper class that fetches job stats for the desired clients
	class JobStats
	attr_reader :client_ids, :active_jobs, :last_jobs, :jobs_sizes, :jobs_files

	# Initializes the object.
	def initialize(client_ids=nil)
	@client_ids = client_ids
	fetch_stats
	end

	private

	# Assigns values to:
	#
	# * active_jobs
	# * last_jobs
	# * jobs_sizes
	# * jobs_files
	def fetch_stats
	@active_jobs = Job.running
	@active_jobs = @active_jobs.where(ClientId: client_ids) if client_ids
	@active_jobs = @active_jobs.group(:ClientId).count

	@last_jobs = {}
	@jobs_sizes = Hash.new { \|h,k\| h[k] = 0 }
	@jobs_files = Hash.new { \|h,k\| h[k] = 0 }

	jobs = Job.backup_type.order(EndTime: :asc)
	jobs = jobs.where(ClientId: client_ids) if client_ids
	jobs.each do \|job\|
	@last_jobs[job.client_id] = I18n.l(job.end_time, format: :long) if job.end_time
	@jobs_sizes[job.client_id] += job.job_bytes
	@jobs_files[job.client_id] += job.job_files
	end
	end
	end