drizzle-team/drizzle-orm · error · Error

You can't use first name generator with a db column length r

Error message

You can't use first name generator with a db column length restriction of ${this.stringLength}. Set the maximum string length to at least ${maxFirstNameLength}.

What it means

Error "You can't use first name generator with a db column length restriction of ${this.stringLength}. Set the maximum string length to at least ${maxFirstNameLength}." thrown in drizzle-team/drizzle-orm.

Source

Thrown at drizzle-seed/src/services/Generators.ts:1577

export class GenerateFirstName extends AbstractGenerator<{
	isUnique?: boolean;
	arraySize?: number;
}> {
	static override readonly entityKind: string = 'GenerateFirstName';

	override timeSpent: number = 0;
	private state: {
		rng: prand.RandomGenerator;
	} | undefined;
	override uniqueVersionOfGen = GenerateUniqueFirstName;

	override init({ count, seed }: { count: number; seed: number }) {
		super.init({ count, seed });

		const rng = prand.xoroshiro128plus(seed);

		if (this.stringLength !== undefined && this.stringLength < maxFirstNameLength) {
			throw new Error(
				`You can't use first name generator with a db column length restriction of ${this.stringLength}. Set the maximum string length to at least ${maxFirstNameLength}.`,
			);
		}

		this.state = { rng };
	}

	generate() {
		if (this.state === undefined) {
			throw new Error('state is not defined.');
		}

		// logic for this generator
		// names dataset contains about 30000 unique names.
		let idx: number;

		[idx, this.state.rng] = prand.uniformIntDistribution(0, firstNames.length - 1, this.state.rng);
		return firstNames[idx] as string;

View on GitHub (pinned to b7862528fd)

Solutions

1. Increase the column's maximum string length to at least the required first-name length, or use a different generator.

When it happens

Trigger: Using the first-name generator on a varchar column whose length is shorter than the longest possible first name.

Common situations: varchar(n) with small n on name columns; increase column length as the message suggests.

AI-assisted analysis of drizzle-team/drizzle-orm@b7862528fd (2026-08-03). Data as JSON: /data/errors/49cb23ebfac10074.json. Report an issue: GitHub.