All: Use Lerna to manage monorepo

packages/lib/models/Migration.js

@@ -0,0 +1,28 @@
+const BaseModel = require('../BaseModel').default;
+
+const migrationScripts = {
+	20: require('../migrations/20.js'),
+	27: require('../migrations/27.js'),
+	33: require('../migrations/33.js'),
+};
+
+class Migration extends BaseModel {
+	static tableName() {
+		return 'migrations';
+	}
+
+	static modelType() {
+		return BaseModel.TYPE_MIGRATION;
+	}
+
+	static migrationsToDo() {
+		return this.modelSelectAll('SELECT * FROM migrations ORDER BY number ASC');
+	}
+
+	static script(number) {
+		if (!migrationScripts[number]) throw new Error('Migration script has not been added to "migrationScripts" array');
+		return migrationScripts[number];
+	}
+}
+
+module.exports = Migration;