Sources/XCMetricsBackendLib/Common/Repositories/Postgress/Migrations/AddTargetIdentifierIndexes.swift

// Copyright (c) 2021 Spotify AB.
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
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// KIND, either express or implied.  See the License for the
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import Foundation

import Fluent
import FluentSQL

struct AddTargetIdentifierIndexToSteps: Migration {

    func prepare(on database: Database) -> EventLoopFuture<Void> {
        guard let sql = database as? SQLDatabase else {
            preconditionFailure("AddTargetIdentifierIndexToSteps can only run on a SQL database")
        }

        return sql.raw("""
                CREATE INDEX "index_target_identifier_on_steps"
                ON \(raw: Step.schema) using btree(target_identifier);
                """)
                .run()
    }

    func revert(on database: Database) -> EventLoopFuture<Void> {
        guard let sql = database as? SQLDatabase else {
            preconditionFailure("AddTargetIdentifierIndexToSteps can only run on a SQL database")
        }
        return sql.raw("""
                DROP INDEX "index_target_identifier_on_steps";
                """)
                .run()
    }

}