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javascriptrethinkdbreql
aleclarson
aleclarson

Reputation: 19035

Converting an array into an object with REQL

I'm looking for the most concise way to convert an array to an object while plucking the field used as the key for each result.

This is the solution I found, and I'm wondering if there's an easier way.

r.table('product').fold({}, function(products, product) {
  return products.merge(
    r.object(
      product('id').coerceTo('string'),
      product.without('id')
    )
  );
})

Thanks!

Example

// Input:
[{ id: 0, price: 19.99 }, { id: 1, price: 24.99 }]

// Output:
{ "0": { price: 19.99 }, "1": { price: 24.99 } }

Upvotes: 0

Views: 42

Answers (1)

Kludge
Kludge

Reputation: 2835

I'm not an expert, but AFAIK, using fold() directly on a table will "stop subsequent commands from being parallelized": https://www.rethinkdb.com/docs/optimization/

So, if I'm not mistaken, if the order is not important it might be better to choose reduce() over fold(), e.g.

table.map(function(row) {
    return r.object(
      row('id').coerceTo('string'), row.without('id')
    )
  })
  .reduce(function(left, right) {
    return left.merge(right)
  })

Upvotes: 1

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