document.update()

Update document fields.

Signature

update(object: { ttl: Time | Null, *: Any }): <Document>

Description

The update() method updates the document with the object fields and returns the updated document. During the update, fields from object are copied to the document, creating new fields or updating existing fields. The operation is similar to a merge.

Only the fields included in object are updated, all other document fields aren’t updated. Fields with nested objects in object are merged with the identically named nested object in the document.

Remove a field

To remove a document field, set its value in object to null. Deleted fields aren’t saved.

Default values

A field definition can set a default field value for documents in a collection. Default values are not inserted for missing or null fields during a document update.

Parameters

Parameter Type Required Description

object

Object

Yes

Object with the updated document fields.

object fields

Name Type Required Description

ttl

Time

Expiration timestamp for the document. When the ttl timestamp passes, Fauna deletes the document. Default = null, which leaves the ttl unchanged.

Return value

Type Description

Document

Document with updated fields.

Examples

Given the following document:

{
  id: "392886847463751746",
  coll: Product,
  ts: Time("2099-04-10T16:50:12.850Z"),
  name: "limes",
  description: "Conventional, 16 oz bag",
  price: 299,
  stock: 30,
  category: Category("401610017107607625")
}

Call update() with an object containing updated document fields:

Product.byId("392886847463751746")?.update({
  name: "key limes",
  stock: 100
})
{
  id: "392886847463751746",
  coll: Product,
  ts: Time("2099-04-10T16:50:12.850Z"),
  name: "key limes",
  description: "Conventional, 16 oz bag",
  price: 299,
  stock: 100,
  category: Category("401610017107607625")
}

Remove a field

To remove a document field, set its value to null. Fields with null values aren’t stored or returned.

Product.byId("392886847463751746")?.update({
  stock: null
})
{
  id: "394802471374946368",
  coll: Product,
  ts: Time("2099-04-10T17:59:50.970Z"),
  name: "key limes",
  description: "Organic, 1 ct",
  price: 65
}

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