How to filter dynamically in strapi - strapi

Question

This might be the noobiest Strapi or possibly backend question at all, but I have just started doing backend, so please bear with me.
That being said, I have the following case. I am building an online shop and every product I have has a price (a required field) and new_price (optional). When I filter my API by min-max value, I would like to filter price if new_price is not available and new_price if it is available. Is this possible at all in strapi?
{
id: 2,
attributes: {
name: "My name",
createdAt: "2022-01-15T11:28:46.138Z",
updatedAt: "2022-02-16T10:38:20.412Z",
publishedAt: "2022-01-15T11:29:30.306Z",
description: "Lorem ipsum",
item_code: "688002",
slug: "some-slug-here",
available: true,
price: 59,
new_price: 21.9
}
http://localhost:1337/api/products?filters[price || new_price][$gte]=50

Answer 1

You're answer is perfectly fine. Just posted my full implementation here so that it may help others who stumble upon it.
const qs = require("qs");
const query = qs.stringify(
{
filters: {
$or: [
{
$and: [
{ new_price: { $notNull: true } },
{ new_price: { $gte: minPrice } },
{ new_price: { $lte: maxPrice } },
],
},
{
$and: [
{ new_price: { $null: true } },
{ price: { $gte: minPrice } },
{ price: { $lte: maxPrice } },
],
},
],
},
},
{
encodeValuesOnly: true,
}
);
await request(`/api/books?${query}`);

Answer 2

So I came up with this solution. It might be ugly and not how it's done, but it works, and I couldn't think of anything else. If somebody has a better solution, I will greatly appreciate it!
const query = qs.stringify(
{
populate: '*',
pagination: {
page: page,
pageSize: PER_PAGE
},
filters: {
$or: [
{
$and: [
[
{
new_price: {
$null: true
}
},
{
price: {
$gte: minPrice
}
},
{
price: {
$lte: maxPrice
}
}
]
]
},
{
$and: [
[
{
new_price: {
$notNull: true
}
},
{
new_price: {
$gte: minPrice
}
},
{
new_price: {
$lte: maxPrice
}
}
]
]
}
]
}
},