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class AddUniqueConstraintToProjectFeaturesProjectId < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
class ProjectFeature < ActiveRecord::Base
self.table_name = 'project_features'
include EachBatch
end
def up
remove_duplicates
add_concurrent_index :project_features, :project_id, unique: true, name: 'index_project_features_on_project_id_unique'
remove_concurrent_index_by_name :project_features, 'index_project_features_on_project_id'
rename_index :project_features, 'index_project_features_on_project_id_unique', 'index_project_features_on_project_id'
end
def down
rename_index :project_features, 'index_project_features_on_project_id', 'index_project_features_on_project_id_old'
add_concurrent_index :project_features, :project_id
remove_concurrent_index_by_name :project_features, 'index_project_features_on_project_id_old'
end
private
def remove_duplicates
features = ProjectFeature
.select('MAX(id) AS max, COUNT(id), project_id')
.group(:project_id)
.having('COUNT(id) > 1')
features.each do |feature|
ProjectFeature
.where(project_id: feature['project_id'])
.where('id <> ?', feature['max'])
.each_batch { |batch| batch.delete_all }
end
end
end
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