VirtualRowProps

Defined in: packages/db/src/virtual-props.ts:76

Virtual properties recognized on TanStack DB rows. The new $hasPendingWrites field is optional here so legacy four-field rows accepted by hasVirtualProps remain assignable. Rows returned by collections use WithVirtualProps, which requires it.

These properties are:

Computed (not stored in the data model)
Read-only (cannot be mutated directly)
Available in queries (WHERE, ORDER BY, SELECT)
Included when spreading rows (...user)

Examples

// Accessing virtual properties on a row
const user = collection.get('user-1')
if (!user.$hasPendingWrites) {
  console.log('No pending local optimistic writes for this row')
}
if (user.$origin === 'local') {
  console.log('Row has local attribution')
}

// Using virtual properties in queries
const ordersWithoutLocalWrites = createLiveQueryCollection({
  query: (q) => q
    .from({ order: orders })
    .where(({ order }) => eq(order.$hasPendingWrites, false))
})

Type Parameters

TKey

TKey extends string | number = string | number

The type of the row's key (string or number)

Properties

$collectionId

readonly $collectionId: string;

Defined in: packages/db/src/virtual-props.ts:133

The ID of the source collection this row originated from.

In joins, this can help identify which collection each row came from. For live query collections, this is the ID of the upstream collection.

$hasPendingWrites?

readonly optional $hasPendingWrites: boolean;

Defined in: packages/db/src/virtual-props.ts:87

Whether this row currently has pending local optimistic writes.

This describes the row's local optimistic state, not backend upload or acknowledgement. It is always false for local-only collections. It is optional only for compatibility with legacy rows; collection-published rows always provide it.

$key

readonly $key: TKey;

Defined in: packages/db/src/virtual-props.ts:125

The row's key (primary identifier).

This is the same value returned by collection.config.getKey(row). Useful when you need the key in projections or computations.

$origin

readonly $origin: VirtualOrigin;

Defined in: packages/db/src/virtual-props.ts:117

Collection attribution for this row's current value. 'local' covers optimistic rows and attributed source writes; 'remote' covers source writes without local attribution. See VirtualOrigin for the key-and-timing rules, including truncate and overlapping mutations.

For local-only collections, this is always 'local'. For live query collections, this is passed through from the source collection.

$synced

readonly $synced: boolean;

Defined in: packages/db/src/virtual-props.ts:106

Whether this row currently has no pending local optimistic writes.

true: No pending local optimistic mutation currently affects this row
false: One or more pending local optimistic mutations currently affect this row

This is local mutation status. It does not prove that a backend has uploaded, confirmed, or read back the row. If you need backend-confirmed status, keep your mutation function pending until that backend observation has happened, or expose adapter-specific status.

For local-only collections (no sync), this is always true. For live query collections, this is passed through from the source collection.