errors.ts

import type pg from "pg";

/**
 * OnlyOneError is thrown when queryExactlyOne is called with a query that
 * returns no rows.
 */
export class OnlyOneError extends Error {
  constructor(m: string) {
    super(m);
    Object.setPrototypeOf(this, OnlyOneError.prototype);
  }
}

/**
 * UniqueConstraintErrors are thrown when a unique constraint fails
 */
export class UniqueConstraintError extends Error {
  constraint;

  constructor(message: string, constraint: string) {
    super(message);
    this.constraint = constraint;

    Object.setPrototypeOf(this, UniqueConstraintError.prototype);
  }

  static fromDBError(error: pg.DatabaseError) {
    if (!error.constraint) {
      throw new Error("Created constraint error without constraint property");
    }

    return new UniqueConstraintError(error.message, error.constraint);
  }
}