<commit_before>class Keepr::CostCenter < ActiveRecord::Base
  self.table_name = 'keepr_cost_centers'

  validates_presence_of :number, :name

  has_many :keepr_postings, :class_name => 'Keepr::Posting', :foreign_key => 'keepr_cost_center_id'
end<commit_msg>CostCenter: Add missing validation<commit_after>class Keepr::CostCenter < ActiveRecord::Base
  self.table_name = 'keepr_cost_centers'

  validates_presence_of :number, :name
  validates_uniqueness_of :number

  has_many :keepr_postings, :class_name => 'Keepr::Posting', :foreign_key => 'keepr_cost_center_id'
end
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