TanStack
API Reference

Collection

Defined in: packages/db/src/collection/index.ts:145

Enhanced Collection interface that includes both data type T and utilities TUtils

Extends

Type Parameters

T

T extends object = Record<string, unknown>

The type of items in the collection

TKey

TKey extends string | number = string | number

The type of the key for the collection

TUtils

TUtils extends UtilsRecord = UtilsRecord

The utilities record type

TSchema

TSchema extends StandardSchemaV1 = StandardSchemaV1

TInsertInput

TInsertInput extends object = T

The type for insert operations (can be different from T for schemas with defaults)

Properties

_lifecycle

ts
_lifecycle: CollectionLifecycleManager<T, TKey, TSchema, TInsertInput>;

Defined in: packages/db/src/collection/index.ts:384

Inherited from

CollectionImpl._lifecycle


_state

ts
_state: CollectionStateManager<T, TKey, TSchema, TInsertInput>;

Defined in: packages/db/src/collection/index.ts:396

Inherited from

CollectionImpl._state


_sync

ts
_sync: CollectionSyncManager<T, TKey, TSchema, TInsertInput>;

Defined in: packages/db/src/collection/index.ts:385

Inherited from

CollectionImpl._sync


config

ts
config: CollectionConfig<T, TKey, TSchema, TUtils>;

Defined in: packages/db/src/collection/index.ts:375

Inherited from

CollectionImpl.config


deferDataRefresh

ts
deferDataRefresh: Promise<void> | null = null;

Defined in: packages/db/src/collection/index.ts:403

When set, collection consumers should defer processing incoming data refreshes until this promise resolves. This prevents stale data from overwriting optimistic state while pending writes are being applied.

Inherited from

CollectionImpl.deferDataRefresh


id

ts
id: string;

Defined in: packages/db/src/collection/index.ts:374

Inherited from

CollectionImpl.id


singleResult?

ts
readonly optional singleResult: true;

Defined in: packages/db/src/collection/index.ts:153


utils

ts
readonly utils: TUtils;

Defined in: packages/db/src/collection/index.ts:152

Overrides

CollectionImpl.utils

Accessors

_layoutRevision

Get Signature

ts
get _layoutRevision(): number;

Defined in: packages/db/src/collection/index.ts:548

Monotonic revision of explicit layout-only publications. Internal — used to distinguish them from empty ready events.

Returns

number

Inherited from

CollectionImpl._layoutRevision


_stateRevision

Get Signature

ts
get _stateRevision(): number;

Defined in: packages/db/src/collection/index.ts:540

Monotonic revision of the collection's visible state; advances once per committed batch of changes and cleanup, even while nothing is subscribed. Internal — used by the live-query observer's snapshot cache.

Returns

number

Inherited from

CollectionImpl._stateRevision


base

Get Signature

ts
get base(): CollectionBase<TKey, TOutput>;

Defined in: packages/db/src/collection/index.ts:657

The exposed authoritative base rows, before optimistic writes are applied. Queued sync writes are excluded. Reading does not start sync. Do not mutate the backing map or its rows: that bypasses publication.

Returns

CollectionBase<TKey, TOutput>

Inherited from

CollectionImpl.base


compareOptions

Get Signature

ts
get compareOptions(): StringCollationConfig;

Defined in: packages/db/src/collection/index.ts:828

Returns

StringCollationConfig

Inherited from

CollectionImpl.compareOptions


indexes

Get Signature

ts
get indexes(): Map<number, BaseIndex<TKey>>;

Defined in: packages/db/src/collection/index.ts:813

Get resolved indexes for query optimization

Returns

Map<number, BaseIndex<TKey>>

Inherited from

CollectionImpl.indexes


isLoadingSubset

Get Signature

ts
get isLoadingSubset(): boolean;

Defined in: packages/db/src/collection/index.ts:606

Check if the collection is currently loading more data

Returns

boolean

true if the collection has pending load more operations, false otherwise

Inherited from

CollectionImpl.isLoadingSubset


size

Get Signature

ts
get size(): number;

Defined in: packages/db/src/collection/index.ts:678

Get the current size of the collection (cached)

Returns

number

Inherited from

CollectionImpl.size


state

Get Signature

ts
get state(): Map<TKey, WithVirtualProps<TOutput, TKey>>;

Defined in: packages/db/src/collection/index.ts:1005

Gets the current state of the collection as a Map

Example
ts
const itemsMap = collection.state
console.log(`Collection has ${itemsMap.size} items`)

for (const [key, item] of itemsMap) {
  console.log(`${key}: ${item.title}`)
}

// Check if specific item exists
if (itemsMap.has("todo-1")) {
  console.log("Todo 1 exists:", itemsMap.get("todo-1"))
}
Returns

Map<TKey, WithVirtualProps<TOutput, TKey>>

Map containing all items in the collection, with keys as identifiers

Inherited from

CollectionImpl.state


status

Get Signature

ts
get status(): CollectionStatus;

Defined in: packages/db/src/collection/index.ts:524

Gets the current status of the collection

Returns

CollectionStatus

Inherited from

CollectionImpl.status


subscriberCount

Get Signature

ts
get subscriberCount(): number;

Defined in: packages/db/src/collection/index.ts:531

Get the number of subscribers to the collection

Returns

number

Inherited from

CollectionImpl.subscriberCount


toArray

Get Signature

ts
get toArray(): WithVirtualProps<TOutput, TKey>[];

Defined in: packages/db/src/collection/index.ts:1034

Gets the current state of the collection as an Array

Returns

WithVirtualProps<TOutput, TKey>[]

An Array containing all items in the collection

Inherited from

CollectionImpl.toArray

Methods

_deferPublication()

ts
_deferPublication(): PublicationDeferral;

Defined in: packages/db/src/collection/index.ts:563

Defer subscriber events until a coherent multi-Collection commit ends.

Returns

PublicationDeferral

Inherited from

CollectionImpl._deferPublication


_deferSyncStart()

ts
_deferSyncStart(): boolean;

Defined in: packages/db/src/collection/index.ts:635

Internal

Returns

boolean

Inherited from

CollectionImpl._deferSyncStart


_hasHydratedKey()

ts
_hasHydratedKey(key): boolean;

Defined in: packages/db/src/collection/index.ts:630

Internal

Parameters

key

TKey

Returns

boolean

Inherited from

CollectionImpl._hasHydratedKey


_markLayoutChange()

ts
_markLayoutChange(): void;

Defined in: packages/db/src/collection/index.ts:558

Mark the active sync transaction as layout-changing. Internal.

Returns

void

Inherited from

CollectionImpl._markLayoutChange


_onCleanupStart()

ts
_onCleanupStart(callback): () => void;

Defined in: packages/db/src/collection/index.ts:620

Internal

Subscribe to the synchronous cleanup-start boundary.

Parameters

callback

() => void

Returns

ts
(): void;
Returns

void

Inherited from

CollectionImpl._onCleanupStart


_resumeSyncStart()

ts
_resumeSyncStart(): void;

Defined in: packages/db/src/collection/index.ts:640

Internal

Returns

void

Inherited from

CollectionImpl._resumeSyncStart


_setTransactionScope()

ts
_setTransactionScope(transactionScope): void;

Defined in: packages/db/src/collection/index.ts:625

Internal

Parameters

transactionScope

TransactionScope

Returns

void

Inherited from

CollectionImpl._setTransactionScope


_subscribeLayoutChanges()

ts
_subscribeLayoutChanges(listener): () => void;

Defined in: packages/db/src/collection/index.ts:553

Subscribe to layout-only publications. Internal observer channel.

Parameters

listener

() => void

Returns

ts
(): void;
Returns

void

Inherited from

CollectionImpl._subscribeLayoutChanges


[iterator]()

ts
iterator: IterableIterator<[TKey, WithVirtualProps<T, TKey>]>;

Defined in: packages/db/src/collection/index.ts:716

Get all entries (virtual derived state)

Returns

IterableIterator<[TKey, WithVirtualProps<T, TKey>]>

Inherited from

CollectionImpl.[iterator]


cleanup()

ts
cleanup(): Promise<void>;

Defined in: packages/db/src/collection/index.ts:1206

Clean up the collection by stopping sync and clearing data This can be called manually or automatically by garbage collection Cleanup callbacks must not restart this collection or call its preload(). Wait until cleanup completes before starting a new sync run. If adapter cleanup rejects, this promise rejects after the Collection reaches its final cleaned-up state.

Returns

Promise<void>

Inherited from

CollectionImpl.cleanup


createIndex()

ts
createIndex<TIndexType>(indexCallback, config): BaseIndex<TKey>;

Defined in: packages/db/src/collection/index.ts:782

Creates an index on a collection for faster queries. Indexes significantly improve query performance by allowing constant time lookups and logarithmic time range queries instead of full scans.

Type Parameters

TIndexType

TIndexType extends IndexConstructor<TKey>

Parameters

indexCallback

(row) => any

Function that extracts the indexed value from each item

config

IndexOptions<TIndexType> = {}

Configuration including index type and type-specific options

Returns

BaseIndex<TKey>

The created index

Example

ts
import { BasicIndex } from '@tanstack/db'

// Create an index with explicit type
const ageIndex = collection.createIndex((row) => row.age, {
  indexType: BasicIndex
})

// Create an index with collection's default type
const nameIndex = collection.createIndex((row) => row.name)

Inherited from

CollectionImpl.createIndex


currentStateAsChanges()

ts
currentStateAsChanges(options): 
  | void
  | ChangeMessage<WithVirtualProps<T, TKey>, TKey>[];

Defined in: packages/db/src/collection/index.ts:1072

Returns the current state of the collection as an array of changes

Parameters

options

CurrentStateAsChangesOptions = {}

Options including optional where filter

Returns

| void | ChangeMessage<WithVirtualProps<T, TKey>, TKey>[]

An array of changes

Example

ts
// Get all items as changes
const allChanges = collection.currentStateAsChanges()

// Get only items matching a condition
const activeChanges = collection.currentStateAsChanges({
  where: (row) => row.status === 'active'
})

// Get only items using a pre-compiled expression
const activeChanges = collection.currentStateAsChanges({
  whereExpression: eq(row.status, 'active')
})

Inherited from

CollectionImpl.currentStateAsChanges


delete()

ts
delete(keys, config?): Transaction<any>;

Defined in: packages/db/src/collection/index.ts:982

Deletes one or more items from the collection

Parameters

keys

Single key or array of keys to delete

TKey | TKey[]

config?

OperationConfig

Optional configuration including metadata

Returns

Transaction<any>

A Transaction object representing the delete operation(s)

Examples

ts
// Delete a single item
const tx = collection.delete("todo-1")
await tx.when('settled')
ts
// Delete multiple items
const tx = collection.delete(["todo-1", "todo-2"])
await tx.when('settled')
ts
// Delete with metadata
const tx = collection.delete("todo-1", { metadata: { reason: "completed" } })
await tx.when('settled')
ts
// Handle errors
try {
  const tx = collection.delete("item-1")
  await tx.when('settled')
  console.log('Delete successful')
} catch (error) {
  console.log('Delete failed:', error)
}

Inherited from

CollectionImpl.delete


entries()

ts
entries(): IterableIterator<[TKey, WithVirtualProps<T, TKey>]>;

Defined in: packages/db/src/collection/index.ts:704

Get all entries (virtual derived state)

Returns

IterableIterator<[TKey, WithVirtualProps<T, TKey>]>

Inherited from

CollectionImpl.entries


forEach()

ts
forEach(callbackfn): void;

Defined in: packages/db/src/collection/index.ts:725

Execute a callback for each entry in the collection

Parameters

callbackfn

(value, key, index) => void

Returns

void

Inherited from

CollectionImpl.forEach


get()

ts
get(key): 
  | WithVirtualProps<T, TKey>
  | undefined;

Defined in: packages/db/src/collection/index.ts:664

Get the current value for a key (virtual derived state)

Parameters

key

TKey

Returns

| WithVirtualProps<T, TKey> | undefined

Inherited from

CollectionImpl.get


getIndexMetadata()

ts
getIndexMetadata(): CollectionIndexMetadata[];

Defined in: packages/db/src/collection/index.ts:806

Returns a snapshot of current index metadata sorted by indexId. Persistence wrappers can use this to bootstrap index state if indexes were created before event listeners were attached.

Returns

CollectionIndexMetadata[]

Inherited from

CollectionImpl.getIndexMetadata


getKeyFromItem()

ts
getKeyFromItem(item): TKey;

Defined in: packages/db/src/collection/index.ts:756

Parameters

item

T

Returns

TKey

Inherited from

CollectionImpl.getKeyFromItem


has()

ts
has(key): boolean;

Defined in: packages/db/src/collection/index.ts:671

Check if a key exists in the collection (virtual derived state)

Parameters

key

TKey

Returns

boolean

Inherited from

CollectionImpl.has


insert()

ts
insert(data, config?): Transaction<Record<string, unknown>>;

Defined in: packages/db/src/collection/index.ts:869

Inserts one or more items into the collection

Parameters

data

TInsertInput | TInsertInput[]

config?

InsertConfig

Optional configuration including metadata

Returns

Transaction<Record<string, unknown>>

A Transaction object representing the insert operation(s)

Throws

If the data fails schema validation

Examples

ts
// Insert a single todo (requires onInsert handler)
const tx = collection.insert({ id: "1", text: "Buy milk", completed: false })
await tx.when('settled')
ts
// Insert multiple todos at once
const tx = collection.insert([
  { id: "1", text: "Buy milk", completed: false },
  { id: "2", text: "Walk dog", completed: true }
])
await tx.when('settled')
ts
// Insert with metadata
const tx = collection.insert({ id: "1", text: "Buy groceries" },
  { metadata: { source: "mobile-app" } }
)
await tx.when('settled')
ts
// Handle errors
try {
  const tx = collection.insert({ id: "1", text: "New item" })
  await tx.when('settled')
  console.log('Insert successful')
} catch (error) {
  console.log('Insert failed:', error)
}

Inherited from

CollectionImpl.insert


isReady()

ts
isReady(): boolean;

Defined in: packages/db/src/collection/index.ts:598

Check if the collection is ready for use Returns true if the collection has been marked as ready by its sync implementation

Returns

boolean

true if the collection is ready, false otherwise

Example

ts
if (collection.isReady()) {
  console.log('Collection is ready, data is available')
  // Safe to access collection.state
} else {
  console.log('Collection is still loading')
}

Inherited from

CollectionImpl.isReady


keys()

ts
keys(): IterableIterator<TKey>;

Defined in: packages/db/src/collection/index.ts:685

Get all keys (virtual derived state)

Returns

IterableIterator<TKey>

Inherited from

CollectionImpl.keys


map()

ts
map<U>(callbackfn): U[];

Defined in: packages/db/src/collection/index.ts:741

Create a new array with the results of calling a function for each entry in the collection

Type Parameters

U

U

Parameters

callbackfn

(value, key, index) => U

Returns

U[]

Inherited from

CollectionImpl.map


off()

ts
off<T>(event, callback): void;

Defined in: packages/db/src/collection/index.ts:1181

Unsubscribe from a collection event

Type Parameters

T

T extends | "status:error" | "status:idle" | "status:loading" | "status:ready" | "status:cleaned-up" | "status:change" | "subscribers:change" | "loadingSubset:change" | "truncate" | "index:added" | "index:removed"

Parameters

event

T

callback

CollectionEventHandler<T>

Returns

void

Inherited from

CollectionImpl.off


on()

ts
on<T>(event, callback): () => void;

Defined in: packages/db/src/collection/index.ts:1161

Subscribe to a collection event

Type Parameters

T

T extends | "status:error" | "status:idle" | "status:loading" | "status:ready" | "status:cleaned-up" | "status:change" | "subscribers:change" | "loadingSubset:change" | "truncate" | "index:added" | "index:removed"

Parameters

event

T

callback

CollectionEventHandler<T>

Returns

ts
(): void;
Returns

void

Inherited from

CollectionImpl.on


once()

ts
once<T>(event, callback): () => void;

Defined in: packages/db/src/collection/index.ts:1171

Subscribe to a collection event once

Type Parameters

T

T extends | "status:error" | "status:idle" | "status:loading" | "status:ready" | "status:cleaned-up" | "status:change" | "subscribers:change" | "loadingSubset:change" | "truncate" | "index:added" | "index:removed"

Parameters

event

T

callback

CollectionEventHandler<T>

Returns

ts
(): void;
Returns

void

Inherited from

CollectionImpl.once


onFirstReady()

ts
onFirstReady(callback): () => void;

Defined in: packages/db/src/collection/index.ts:582

Register a callback to be executed when the collection first becomes ready Useful for preloading collections Every callback queued before the transition runs. Because ready state is established first, callbacks registered during or after delivery run immediately. If one throws, the collection remains ready. Direct sync startup rethrows the first failure; preload resolves from ready state. Cleanup discards pending callbacks without invoking them.

Parameters

callback

() => void

Function to call when the collection first becomes ready

Returns

ts
(): void;
Returns

void

Example

ts
collection.onFirstReady(() => {
  console.log('Collection is ready for the first time')
  // Safe to access collection.state now
})

Inherited from

CollectionImpl.onFirstReady


preload()

ts
preload(): Promise<void>;

Defined in: packages/db/src/collection/index.ts:648

Preload the collection data by starting sync if not already started Multiple concurrent calls will share the same promise

Returns

Promise<void>

Inherited from

CollectionImpl.preload


removeIndex()

ts
removeIndex(indexOrId): boolean;

Defined in: packages/db/src/collection/index.ts:797

Removes an index created with createIndex. Returns true when an index existed and was removed.

Best-effort semantics: removing an index guarantees it is detached from collection query planning. Existing index proxy references should be treated as invalid after removal.

Parameters

indexOrId

number | BaseIndex<TKey>

Returns

boolean

Inherited from

CollectionImpl.removeIndex


startSyncImmediate()

ts
startSyncImmediate(): void;

Defined in: packages/db/src/collection/index.ts:615

Start sync immediately - internal method for compiled queries This bypasses lazy loading for special cases like live query results Throws during active cleanup; restart after cleanup completes instead.

Returns

void

Inherited from

CollectionImpl.startSyncImmediate


stateWhenReady()

ts
stateWhenReady(): Promise<Map<TKey, WithVirtualProps<T, TKey>>>;

Defined in: packages/db/src/collection/index.ts:1019

Gets the current state of the collection as a Map, but only resolves when data is available Waits for the first sync commit to complete before resolving

Returns

Promise<Map<TKey, WithVirtualProps<T, TKey>>>

Promise that resolves to a Map containing all items in the collection

Inherited from

CollectionImpl.stateWhenReady


subscribeChanges()

Call Signature

ts
subscribeChanges(callback, options?): CollectionSubscription;

Defined in: packages/db/src/collection/index.ts:1124

Subscribe to changes in the collection Changes to the same key retain their causal order within a callback. Changes to different keys have no promised order within a callback.

Parameters
callback

(changes) => void

Function called when items change

options?

SubscribeChangesOptions<T, TKey>

Subscription options including includeInitialState and where filter

Returns

CollectionSubscription

Unsubscribe function - Call this to stop listening for changes

Examples
ts
// Basic subscription
const subscription = collection.subscribeChanges((changes) => {
  changes.forEach(change => {
    console.log(`${change.type}: ${change.key}`, change.value)
  })
})

// Later: subscription.unsubscribe()
ts
// Include current state immediately
const subscription = collection.subscribeChanges((changes) => {
  updateUI(changes)
}, { includeInitialState: true })
ts
// Subscribe only to changes matching a condition using where callback
import { eq } from "@tanstack/db"

const subscription = collection.subscribeChanges((changes) => {
  updateUI(changes)
}, {
  includeInitialState: true,
  where: (row) => eq(row.status, "active")
})
ts
// Using multiple conditions with and()
import { and, eq, gt } from "@tanstack/db"

const subscription = collection.subscribeChanges((changes) => {
  updateUI(changes)
}, {
  where: (row) => and(eq(row.status, "active"), gt(row.priority, 5))
})
Inherited from

CollectionImpl.subscribeChanges

Call Signature

ts
subscribeChanges(callback, options?): CollectionSubscription;

Defined in: packages/db/src/collection/index.ts:1132

Subscribe to changes in the collection Changes to the same key retain their causal order within a callback. Changes to different keys have no promised order within a callback.

Parameters
callback

Function called when items change

(changes) => void | (changes) => void

options?

SubscribeChangesOptions<T, TKey>

Subscription options including includeInitialState and where filter

Returns

CollectionSubscription

Unsubscribe function - Call this to stop listening for changes

Examples
ts
// Basic subscription
const subscription = collection.subscribeChanges((changes) => {
  changes.forEach(change => {
    console.log(`${change.type}: ${change.key}`, change.value)
  })
})

// Later: subscription.unsubscribe()
ts
// Include current state immediately
const subscription = collection.subscribeChanges((changes) => {
  updateUI(changes)
}, { includeInitialState: true })
ts
// Subscribe only to changes matching a condition using where callback
import { eq } from "@tanstack/db"

const subscription = collection.subscribeChanges((changes) => {
  updateUI(changes)
}, {
  includeInitialState: true,
  where: (row) => eq(row.status, "active")
})
ts
// Using multiple conditions with and()
import { and, eq, gt } from "@tanstack/db"

const subscription = collection.subscribeChanges((changes) => {
  updateUI(changes)
}, {
  where: (row) => and(eq(row.status, "active"), gt(row.priority, 5))
})
Inherited from

CollectionImpl.subscribeChanges


toArrayWhenReady()

ts
toArrayWhenReady(): Promise<WithVirtualProps<T, TKey>[]>;

Defined in: packages/db/src/collection/index.ts:1044

Gets the current state of the collection as an Array, but only resolves when data is available Waits for the first sync commit to complete before resolving

Returns

Promise<WithVirtualProps<T, TKey>[]>

Promise that resolves to an Array containing all items in the collection

Inherited from

CollectionImpl.toArrayWhenReady


update()

Call Signature

ts
update(key, callback): Transaction;

Defined in: packages/db/src/collection/index.ts:914

Updates one or more items in the collection using a callback function

Parameters
key

TKey[]

callback

(drafts) => void

Returns

Transaction

A Transaction object representing the update operation(s)

Throws

If the updated data fails schema validation

Examples
ts
// Update single item by key
const tx = collection.update("todo-1", (draft) => {
  draft.completed = true
})
await tx.when('settled')
ts
// Update multiple items
const tx = collection.update(["todo-1", "todo-2"], (drafts) => {
  drafts.forEach(draft => { draft.completed = true })
})
await tx.when('settled')
ts
// Update with metadata
const tx = collection.update("todo-1",
  { metadata: { reason: "user update" } },
  (draft) => { draft.text = "Updated text" }
)
await tx.when('settled')
ts
// Handle errors
try {
  const tx = collection.update("item-1", draft => { draft.value = "new" })
  await tx.when('settled')
  console.log('Update successful')
} catch (error) {
  console.log('Update failed:', error)
}
Inherited from

CollectionImpl.update

Call Signature

ts
update(
   keys, 
   config, 
   callback): Transaction;

Defined in: packages/db/src/collection/index.ts:920

Updates one or more items in the collection using a callback function

Parameters
keys

TKey[]

Single key or array of keys to update

config

OperationConfig

callback

(drafts) => void

Returns

Transaction

A Transaction object representing the update operation(s)

Throws

If the updated data fails schema validation

Examples
ts
// Update single item by key
const tx = collection.update("todo-1", (draft) => {
  draft.completed = true
})
await tx.when('settled')
ts
// Update multiple items
const tx = collection.update(["todo-1", "todo-2"], (drafts) => {
  drafts.forEach(draft => { draft.completed = true })
})
await tx.when('settled')
ts
// Update with metadata
const tx = collection.update("todo-1",
  { metadata: { reason: "user update" } },
  (draft) => { draft.text = "Updated text" }
)
await tx.when('settled')
ts
// Handle errors
try {
  const tx = collection.update("item-1", draft => { draft.value = "new" })
  await tx.when('settled')
  console.log('Update successful')
} catch (error) {
  console.log('Update failed:', error)
}
Inherited from

CollectionImpl.update

Call Signature

ts
update(id, callback): Transaction;

Defined in: packages/db/src/collection/index.ts:927

Updates one or more items in the collection using a callback function

Parameters
id

TKey

callback

(draft) => void

Returns

Transaction

A Transaction object representing the update operation(s)

Throws

If the updated data fails schema validation

Examples
ts
// Update single item by key
const tx = collection.update("todo-1", (draft) => {
  draft.completed = true
})
await tx.when('settled')
ts
// Update multiple items
const tx = collection.update(["todo-1", "todo-2"], (drafts) => {
  drafts.forEach(draft => { draft.completed = true })
})
await tx.when('settled')
ts
// Update with metadata
const tx = collection.update("todo-1",
  { metadata: { reason: "user update" } },
  (draft) => { draft.text = "Updated text" }
)
await tx.when('settled')
ts
// Handle errors
try {
  const tx = collection.update("item-1", draft => { draft.value = "new" })
  await tx.when('settled')
  console.log('Update successful')
} catch (error) {
  console.log('Update failed:', error)
}
Inherited from

CollectionImpl.update

Call Signature

ts
update(
   id, 
   config, 
   callback): Transaction;

Defined in: packages/db/src/collection/index.ts:933

Updates one or more items in the collection using a callback function

Parameters
id

TKey

config

OperationConfig

callback

(draft) => void

Returns

Transaction

A Transaction object representing the update operation(s)

Throws

If the updated data fails schema validation

Examples
ts
// Update single item by key
const tx = collection.update("todo-1", (draft) => {
  draft.completed = true
})
await tx.when('settled')
ts
// Update multiple items
const tx = collection.update(["todo-1", "todo-2"], (drafts) => {
  drafts.forEach(draft => { draft.completed = true })
})
await tx.when('settled')
ts
// Update with metadata
const tx = collection.update("todo-1",
  { metadata: { reason: "user update" } },
  (draft) => { draft.text = "Updated text" }
)
await tx.when('settled')
ts
// Handle errors
try {
  const tx = collection.update("item-1", draft => { draft.value = "new" })
  await tx.when('settled')
  console.log('Update successful')
} catch (error) {
  console.log('Update failed:', error)
}
Inherited from

CollectionImpl.update


validateData()

ts
validateData(
   data, 
   type, 
   key?): T;

Defined in: packages/db/src/collection/index.ts:820

Validates the data against the schema

Parameters

data

unknown

type

"insert" | "update"

key?

TKey

Returns

T

Inherited from

CollectionImpl.validateData


values()

ts
values(): IterableIterator<WithVirtualProps<T, TKey>>;

Defined in: packages/db/src/collection/index.ts:692

Get all values (virtual derived state)

Returns

IterableIterator<WithVirtualProps<T, TKey>>

Inherited from

CollectionImpl.values


waitFor()

ts
waitFor<T>(event, timeout?): Promise<AllCollectionEvents[T]>;

Defined in: packages/db/src/collection/index.ts:1191

Wait for a collection event

Type Parameters

T

T extends | "status:error" | "status:idle" | "status:loading" | "status:ready" | "status:cleaned-up" | "status:change" | "subscribers:change" | "loadingSubset:change" | "truncate" | "index:added" | "index:removed"

Parameters

event

T

timeout?

number

Returns

Promise<AllCollectionEvents[T]>

Inherited from

CollectionImpl.waitFor