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32 lines
928 B
32 lines
928 B
8 years ago
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const asyncQ = require('async-q')
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class Migrator {
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constructor (opts = {}) {
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let migrations = opts.migrations || []
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this.migrations = migrations.sort((a, b) => a.version - b.version)
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let lastMigration = this.migrations.slice(-1)[0]
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// use specified defaultVersion or highest migration version
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this.defaultVersion = opts.defaultVersion || lastMigration && lastMigration.version || 0
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}
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// run all pending migrations on meta in place
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migrateData (meta = { version: this.defaultVersion }) {
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let remaining = this.migrations.filter(migrationIsPending)
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return (
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asyncQ.eachSeries(remaining, (migration) => migration.migrate(meta))
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.then(() => meta)
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)
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// migration is "pending" if hit has a higher
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// version number than currentVersion
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function migrationIsPending(migration) {
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return migration.version > meta.version
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}
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}
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}
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module.exports = Migrator
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