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# rubocop:disable all
class AddIndexOnIid < ActiveRecord::Migration[4.2]
def change
RemoveDuplicateIid.clean(Issue)
RemoveDuplicateIid.clean(MergeRequest, 'target_project_id')
RemoveDuplicateIid.clean(Milestone)
add_index :issues, [:project_id, :iid], unique: true
add_index :merge_requests, [:target_project_id, :iid], unique: true
add_index :milestones, [:project_id, :iid], unique: true
end
end
class RemoveDuplicateIid
def self.clean(klass, project_field = 'project_id')
duplicates = klass.find_by_sql("SELECT iid, #{project_field} FROM #{klass.table_name} GROUP BY #{project_field}, iid HAVING COUNT(*) > 1")
duplicates.each do |duplicate|
project_id = duplicate.send(project_field)
iid = duplicate.iid
items = klass.of_projects(project_id).where(iid: iid)
if items.size > 1
puts "Remove #{klass.name} duplicates for iid: #{iid} and project_id: #{project_id}"
items.shift
items.each do |item|
item.destroy
puts '.'
end
end
end
end
end
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