Merge branch 'fix_importers' into 'master'
Fix importers with OCC Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/1180 Using validates_uniqueness_of does not guarantee the absence of duplicate record insertions. When users click button "import all" it will create duplicating group in database and data integrity will be broken. http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#method-i-validates_uniqueness_of I use optimistic concurrency control for handling this situation. See merge request !1647 Conflicts: db/schema.rb
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