init() — drizzle-orm Function Reference

Architecture documentation for the init() function in Generators.ts from the drizzle-orm codebase.

Function typescript DrizzleSeed GenerationService

Entity Profile

DrizzleSeed→ GenerationService→ init() — drizzle-orm Function Reference

Dependency Diagram

graph TD
  4bacf9e4_1557_d91d_6e53_3741dd136ea6["init()"]
  8c61890c_75a8_857d_b5f1_f4778b502166["GenerateUniquePostcode"]
  4bacf9e4_1557_d91d_6e53_3741dd136ea6 -->|defined in| 8c61890c_75a8_857d_b5f1_f4778b502166
  style 4bacf9e4_1557_d91d_6e53_3741dd136ea6 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

drizzle-seed/src/services/Generators.ts lines 2483–2522

	override init({ count, seed }: { count: number; seed: number }) {
		const maxUniquePostcodeNumber = Math.pow(10, 5) + Math.pow(10, 9);
		if (count > maxUniquePostcodeNumber) {
			throw new RangeError(
				`count exceeds max number of unique postcodes(${maxUniquePostcodeNumber}).`,
			);
		}

		const rng = prand.xoroshiro128plus(seed);
		const templates = [
			{
				template: '#####',
				indicesGen: new GenerateUniqueInt({ minValue: 0, maxValue: Math.pow(10, 5) - 1 }),
				placeholdersCount: 5,
				count: 0,
				maxUniquePostcodeNumber: Math.pow(10, 5),
			},
			{
				template: '#####-####',
				indicesGen: new GenerateUniqueInt({ minValue: 0, maxValue: Math.pow(10, 9) - 1 }),
				placeholdersCount: 9,
				count: 0,
				maxUniquePostcodeNumber: Math.pow(10, 9),
			},
		];

		const maxPostcodeLength = Math.max(...templates.map((template) => template.template.length));
		if (this.stringLength !== undefined && this.stringLength < maxPostcodeLength) {
			throw new Error(
				`You can't use postcode generator with a db column length restriction of ${this.stringLength}. Set the maximum string length to at least ${maxPostcodeLength}.`,
			);
		}

		for (const templateObj of templates) {
			templateObj.indicesGen.skipCheck = true;
			templateObj.indicesGen.init({ count, seed });
		}

		this.state = { rng, templates };
	}