Select
Select( path, from, default )Description
The Select function extracts a single value from a document. It
extracts the value specified by the path parameter out of the from
parameter and returns the value. If the path does not exist, the
optional default object is returned. If the default object is not
provided, an error is returned.
Parameter
| Argument | Type | Definition and Requirements |
|---|---|---|
|
Long or String |
The path to a field in the document to extract. |
|
Object |
The object containing the data to be extracted. |
|
Object |
Optional - The value to be returned if the path does not exist. |
Examples
The query below extracts from the top level object named "favorites" and second level array called "foods" the value in position 1 of the array. This value is "munchings".
client.query(
q.Select(
['favorites', 'foods', 1],
{ favorites: { foods: ['crunchings', 'munchings', 'lunchings'] } },
)
)
.then((ret) => console.log(ret))munchingsIn the example below select extracts the "id" attributes from the
Ref.
client.query(q.Select(['id'], q.Database('prydain')))
.then((ret) => console.log(ret))prydainIs this article helpful?
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