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class AddIndexConstraintsToInternalIdTable < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
add_concurrent_index :internal_ids, [:usage, :namespace_id], unique: true, where: 'namespace_id IS NOT NULL'
replace_index(:internal_ids, [:usage, :project_id], name: 'index_internal_ids_on_usage_and_project_id') do
add_concurrent_index :internal_ids, [:usage, :project_id], unique: true, where: 'project_id IS NOT NULL'
end
add_concurrent_foreign_key :internal_ids, :namespaces, column: :namespace_id, on_delete: :cascade
end
def down
remove_concurrent_index :internal_ids, [:usage, :namespace_id]
replace_index(:internal_ids, [:usage, :project_id], name: 'index_internal_ids_on_usage_and_project_id') do
add_concurrent_index :internal_ids, [:usage, :project_id], unique: true
end
remove_foreign_key :internal_ids, column: :namespace_id
end
private
def replace_index(table, columns, name:)
temporary_name = "#{name}_old"
if index_exists?(table, columns, name: name)
rename_index table, name, temporary_name
end
yield
remove_concurrent_index_by_name table, temporary_name
end
end
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