diffColumns() — drizzle-orm Function Reference

Source Code

drizzle-kit/src/jsonDiffer.js lines 122–163

export function diffColumns(left, right) {
	left = JSON.parse(JSON.stringify(left));
	right = JSON.parse(JSON.stringify(right));
	const result = diff(left, right) ?? {};

	const alteredTables = Object.fromEntries(
		Object.entries(result)
			.filter((it) => {
				return !(it[0].includes('__added') || it[0].includes('__deleted'));
			})
			.map((tableEntry) => {
				// const entry = { name: it, ...result[it] }
				const deletedColumns = Object.entries(tableEntry[1].columns ?? {})
					.filter((it) => {
						return it[0].endsWith('__deleted');
					})
					.map((it) => {
						return it[1];
					});

				const addedColumns = Object.entries(tableEntry[1].columns ?? {})
					.filter((it) => {
						return it[0].endsWith('__added');
					})
					.map((it) => {
						return it[1];
					});

				tableEntry[1].columns = {
					added: addedColumns,
					deleted: deletedColumns,
				};
				const table = left[tableEntry[0]];
				return [
					tableEntry[0],
					{ name: table.name, schema: table.schema, ...tableEntry[1] },
				];
			}),
	);

	return alteredTables;
}