KnexJS with multiple tables and aliases

Question

I've been playing with KnexJS lately and I've got most of what I need from KnexJS documentation, however I have a bit more complex MySQL query that I can't 'port' on my own to Knex. I know there's an option to use .raw() , however I'd like to avoid that if possible.

My working MySQL query looks like this:

SELECT A.profile_id, C.model_name, D.brand_name, A.car_plate
FROM carsdb.profiles_has_cars A,
     carsdb.profiles B,
     carsdb.brands_cars C,
     carsdb.brands D
WHERE A.profile_id = B.user_id AND
      A.car_id = C.id AND
      A.brand_id = D.id;

What I got so far is:

  return new Promise((resolve, reject) => {
    db({
      A: "profiles_has_cars",
      B: "profiles",
      C: "brands_cars",
      D: "brands"
    })
      .select("A.profile_id", "C.model_name", "D.brand_name", "A.car_plate")
      .where({
        "A.profile_id": userId,
        "A.car_id": "C.id",
        "A.brand_id": "D.id"
      })
      .then(results => {
        if (results > 0) {
          resolve(results);
        } else {
          reject("There is a problem with a query");
        }
      });
  });

I've also tried using an object as an argument in .where() , but that didn't do anything either.

Any help or suggestion?

Answer 1

Oh, I've got it. knex doesn't understand that .where values are actually references to another fields and interpret them as strings.

Try to replace such with one more for each .whereRaw("A.car_id = C.id") . (For references only, not for actual values).