App Context API for PubNub Swift Native SDK

This page describes App Context (formerly Objects v2). To upgrade from Objects v1, refer to the migration guide.

Migration guide

The PubNub Swift 3.0 SDK contains many significant changes from the 2.x SDK, including breaking changes. Please refer to the PubNub Swift 3.0 Migration Guide for more details.

App Context provides easy-to-use, serverless storage for user and channel data you need to build innovative, reliable, scalable applications. Use App Context to easily store metadata about your application users and channels, and their membership associations, without the need to stand up your own databases.

PubNub also triggers events when object data is set or removed from the database. Clients can receive these events in real-time and update their front-end application accordingly.

User

Get Metadata for All Users

Returns a paginated list of UUID Metadata objects, optionally including the custom data object for each.

Method(s)

To Get All UUID Metadata you can use the following method(s) in the Swift SDK:

allUUIDMetadata(
    include: IncludeFields = IncludeFields(),
    filter: String? = nil,
    sort: [ObjectSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(uuids: [PubNubUUIDMetadata], next: PubNubHashedPage?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`include`	`IncludeFields`	Optional	`IncludeFields()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[ObjectSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.id`, `.name`, and `.updated`.
`page`	`PubNubHashedPage?`	Optional	`PubNub.Page()`	The paging object used for pagination
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`custom`	`RequestConfiguration`	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(uuids: [PubNubUUIDMetadata], next: PubNubHashedPage?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

A Tuple containing an Array of PubNubUUIDMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubUUIDMetadata {
  /// The unique identifier of the UUID
  var metadataId: String { get }

  /// The name of the UUID
  var name: String { get set }

  /// The external identifier for the object
  var externalId: String? { get set }

  /// The profile URL for the object
  var profileURL: String? { get set }

  /// The email address of the object
  var email: String? { get set }
show all 25 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

pubnub.allUUIDMetadata() { result in
  switch result {
  case let .success(response):
    print("The uuid metadata objects \(response.uuids)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
    print("Fetch All request failed with error: \(error.localized### Description)")
  }
}

Get User Metadata

Returns metadata for the specified UUID, optionally including the custom data object for each.

Method(s)

To Get UUID Metadata you can use the following method(s) in the Swift SDK:

fetch(
    uuid metadata: String?,
    include customFields: Bool = true,
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<PubNubUUIDMetadata, Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`uuid`	String	Yes		Unique UUID Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`include`	IncludeFields	Optional	`IncludeFields()`	Whether to include the custom field in the fetch response
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<PubNubUUIDMetadata, Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

The PubNubUUIDMetadata object belonging to the identifier.

public protocol PubNubUUIDMetadata {
  /// The unique identifier of the UUID
  var metadataId: String { get }

  /// The name of the UUID
  var name: String { get set }

  /// The external identifier for the object
  var externalId: String? { get set }

  /// The profile URL for the object
  var profileURL: String? { get set }

  /// The email address of the object
  var email: String? { get set }
show all 25 lines

Failure

An Error describing the failure.

Basic Usage

pubnub.fetch(uuid: "TestUser") { result in
  switch result {
  case let .success(uuidMetadata):
    print("The metadata for `\(uuidMetadata.metadataId)`: \(uuidMetadata)")
  case let .failure(error):
    print("Fetch request failed with error: \(error.localized### Description)")
  }
}

Set User Metadata

Set metadata for a UUID in the database, optionally including the custom data object for each.

Method(s)

To Set UUID Metadata you can use the following method(s) in the Swift SDK:

set(
    uuid metadata: PubNubUUIDMetadata,
    include customFields: Bool = true,
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<PubNubUUIDMetadata, Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`uuid`	PubNubUUIDMetadata	Yes		UUID Metadata to set.
`include`	IncludeFields	Optional	`IncludeFields()`	Whether to include the custom field in the fetch response.
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session. App Context filtering language doesn’t support filtering by custom properties.
`completion`	`((Result<PubNubUUIDMetadata, Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call.

API limits

To learn about the maximum length of parameters used to set user metadata, refer to REST API docs.

Completion Handler Result

Success

The PubNubUUIDMetadata object belonging to the identifier.

public protocol PubNubUUIDMetadata {
  /// The unique identifier of the UUID
  var metadataId: String { get }

  /// The name of the UUID
  var name: String { get set }

  /// The external identifier for the object
  var externalId: String? { get set }

  /// The profile URL for the object
  var profileURL: String? { get set }

  /// The email address of the object
  var email: String? { get set }
show all 25 lines

Failure

An Error describing the failure.

Basic Usage

let johnDoe = PubNubUUIDMetadataBase(
  id: "john-doe", name: "John Doe",
  custom: ["title": "Mr. Manager"]
)

pubnub.set(user: johnDoe) { result in
  switch result {
  case let .success(uuidMetadata):
    print("The metadata for `\(uuidMetadata.metadataId)`: \(uuidMetadata)")
  case let .failure(error):
    print("Create request failed with error: \(error.localized### Description)")
  }
}

Remove User Metadata

Removes the metadata from a specified UUID.

Method(s)

To Remove UUID Metadata you can use the following method(s) in the Swift SDK:

remove(
    uuid metadataId: String?,
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<String, Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`uuid`	String	Yes		Unique UUID Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<PubNubUUIDMetadata, Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Basic Usage

pubnub.remove(uuid: "john-doe") { result in
  switch result {
  case let .success(metadataId):
    print("The metadata has been removed for the uuid `\(metadataId)`")
  case let .failure(error):
    print("Delete request failed with error: \(error.localized### Description)")
  }
}

Channel

Get Metadata for All Channels

Returns a paginated list of Channel Metadata objects, optionally including the custom data object for each.

Method(s)

To Get All Channel Metadata you can use the following method(s) in the Swift SDK:

allChannelMetadata(
    include: IncludeFields = IncludeFields(),
    filter: String? = nil,
    sort: [ObjectSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(uuids: [PubNubChannelMetadata], next: PubNubHashedPage?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`include`	IncludeFields	Optional	`IncludeFields()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[ObjectSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.id`, `.name`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(channels: [PubNubChannelMetadata], next: PubNubHashedPage?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

A Tuple containing an Array of PubNubChannelMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubChannelMetadata {
  /// The unique identifier of the Channel
  var metadataId: String { get }

  /// The name of the Channel
  var name: String { get set }

  /// Text describing the purpose of the channel
  var channelDescription: String? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }

  /// The caching identifier for the object
  var eTag: String? { get set }
show all 19 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

pubnub.allChannelMetadata() { result in
  switch result {
  case let .success(response):
    print("The channel metadata objects \(response.channels)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
    print("Fetch All request failed with error: \(error.localized### Description)")
  }
}

Get Channel Metadata

Returns metadata for the specified Channel, optionally including the custom data object for each.

Method(s)

To Get Channel Metadata you can use the following method(s) in the Swift SDK:

fetch(
    channel metadata: String?,
    include customFields: Bool = true,
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<PubNubChannelMetadata, Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`channel`	String	Yes		Unique Channel Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`include`	IncludeFields	Optional	`IncludeFields()`	Whether to include the custom field in the fetch response
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<PubNubChannelMetadata, Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

The PubNubChannelMetadata object belonging to the identifier.

public protocol PubNubChannelMetadata {
  /// The unique identifier of the Channel
  var metadataId: String { get }

  /// The name of the Channel
  var name: String { get set }

  /// Text describing the purpose of the channel
  var channelDescription: String? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }

  /// The caching identifier for the object
  var eTag: String? { get set }
show all 19 lines

Failure

An Error describing the failure.

Basic Usage

pubnub.fetch(channel: "TestUser") { result in
  switch result {
  case let .success(channelMetadata):
    print("The metadata for `\(channelMetadata.metadataId)`: \(channelMetadata)")
  case let .failure(error):
    print("Fetch request failed with error: \(error.localized### Description)")
  }
}

Set Channel Metadata

Set metadata for a Channel in the database, optionally including the custom data object for each.

Method(s)

To Set Channel Metadata you can use the following method(s) in the Swift SDK:

set(
    channel metadata: PubNubChannelMetadata,
    include customFields: Bool = true,
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<PubNubChannelMetadata, Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`channel`	PubNubChannelMetadata	Yes		Channel Metadata to set.
`include`	IncludeFields	Optional	`IncludeFields()`	Whether to include the custom field in the fetch response.
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session. App Context filtering language doesn’t support filtering by custom properties.
`completion`	`((Result<PubNubChannelMetadata, Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call.

API limits

To learn about the maximum length of parameters used to set channel metadata, refer to REST API docs.

Completion Handler Result

Success

The PubNubChannelMetadata object belonging to the identifier.

public protocol PubNubChannelMetadata {
  /// The unique identifier of the Channel
  var metadataId: String { get }

  /// The name of the Channel
  var name: String { get set }

  /// Text describing the purpose of the channel
  var channelDescription: String? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }

  /// The caching identifier for the object
  var eTag: String? { get set }
show all 19 lines

Failure

An Error describing the failure.

Basic Usage

let johnDoe = PubNubChannelMetadataBase(
  id: "john-doe", name: "John Doe",
  custom: ["title": "Mr. Manager"]
)

pubnub.set(user: johnDoe) { result in
  switch result {
  case let .success(channelMetadata):
    print("The metadata for `\(channelMetadata.metadataId)`: \(channelMetadata)")
  case let .failure(error):
    print("Create request failed with error: \(error.localized### Description)")
  }
}

Remove Channel Metadata

Removes the metadata from a specified channel.

Method(s)

To Remove Channel Metadata you can use the following method(s) in the Swift SDK:

remove(
    channel metadataId: String?,
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<String, Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`channel`	String	Yes		Unique Channel Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<PubNubChannelMetadata, Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Basic Usage

pubnub.remove(channel: "john-doe") { result in
  switch result {
  case let .success(metadataId):
    print("The metadata has been removed for the channel `\(metadataId)`")
  case let .failure(error):
    print("Delete request failed with error: \(error.localized### Description)")
  }
}

Channel Memberships

Get Channel Memberships

The method returns a list of channel memberships for a user. This method doesn't return a user's subscriptions.

Method(s)

To Get Memberships you can use the following method(s) in the Swift SDK:

To Get Channel Memberships you can use the following method(s) in the Swift SDK:

fetchMemberships(
    uuid: String?,
    include: MembershipInclude = MembershipInclude(),
    filter: String? = nil,
    sort: [MembershipSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`uuid`	String	Yes		Unique UUID Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`include`	MembershipInclude	Optional	`MembershipInclude()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[MembershipSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.object(.id)`, `.object(.name)`, `.object(.updated)`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

A Tuple containing an Array of PubNubMembershipMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubMembershipMetadata {
  /// The unique identifier of the associated UUID
  var uuidMetadataId: String { get }

  /// The unique identifier of the associated Channel
  var channelMetadataId: String { get }

  /// The associated UUID metadata
  var uuid: PubNubUUIDMetadata? { get set }

  /// The associated Channel metadata
  var channel: PubNubChannelMetadata? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }
show all 22 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

pubnub.fetchMemberships(uuid: "my_user") { result in
  switch result {
  case let .success(response):
    print("The channel memberships for the uuid \(response.memberships)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
    print("Fetch Memberships request failed with error: \(error.localized### Description)")
  }
}

Set Channel Memberships

Set channel memberships for a UUID.

Method(s)

To Set Channel Memberships you can use the following method(s) in the Swift SDK:

setMemberships(
    uuid metadataId: String?,
    channels memberships: [PubNubMembershipMetadata],
    include: MembershipInclude = MembershipInclude(),
    filter: String? = nil,
    sort: [MembershipSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`uuid`	String	Yes		Unique UUID Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`channels`	[PubNubMembershipMetadata]	Yes		Array of `PubNubMembershipMetadata` with the `PubNubChannelMetadata` or `channelMetadataId` provided
`include`	MembershipInclude	Optional	`MembershipInclude()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[MembershipSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.object(.id)`, `.object(.name)`, `.object(.updated)`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

API limits

To learn about the maximum length of parameters used to set channel membership metadata, refer to REST API docs.

Completion Handler Result

Success

A Tuple containing an Array of PubNubMembershipMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubMembershipMetadata {
  /// The unique identifier of the associated UUID
  var uuidMetadataId: String { get }

  /// The unique identifier of the associated Channel
  var channelMetadataId: String { get }

  /// The associated UUID metadata
  var uuid: PubNubUUIDMetadata? { get set }

  /// The associated Channel metadata
  var channel: PubNubChannelMetadata? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }
show all 22 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

let newMembership = PubNubMembershipMetadataBase(
  uuidMetadataId: "my_user", channelMetadataId: "my_channel"
)

pubnub.setMemberships(
  uuid: newMembership.uuidMetadataId,
  channels: [newMembership]
) { result in
  switch result {
  case let .success(response):
    print("The channel memberships for the uuid \(response.memberships)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
show all 18 lines

Remove Channel Memberships

Remove channel memberships for a UUID.

Method(s)

To Remove Channel Memberships you can use the following method(s) in the Swift SDK:

removeMemberships(
    uuid metadataId: String?,
    channels memberships: [PubNubMembershipMetadata],
    include: MembershipInclude = MembershipInclude(),
    filter: String? = nil,
    sort: [MembershipSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`uuid`	String	Yes		Unique UUID Metadata identifier. If not supplied, then it will use the request configuration and then the default configuration
`channels`	[PubNubMembershipMetadata]	Yes		Array of `PubNubMembershipMetadata` with the `PubNubChannelMetadata` or `channelMetadataId` provided
`include`	MembershipInclude	Optional	`MembershipInclude()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[MembershipSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.object(.id)`, `.object(.name)`, `.object(.updated)`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

A Tuple containing an Array of PubNubMembershipMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubMembershipMetadata {
  /// The unique identifier of the associated UUID
  var uuidMetadataId: String { get }

  /// The unique identifier of the associated Channel
  var channelMetadataId: String { get }

  /// The associated UUID metadata
  var uuid: PubNubUUIDMetadata? { get set }

  /// The associated Channel metadata
  var channel: PubNubChannelMetadata? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }
show all 22 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

let oldMembership = PubNubMembershipMetadataBase(
  uuidMetadataId: "my_user", channelMetadataId: "my_channel"
)

pubnub.removeMemberships(
  uuid: oldMembership.uuidMetadataId,
  channels: [oldMembership]
) { result in
  switch result {
  case let .success(response):
    print("The channel memberships for the uuid \(response.memberships)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
show all 18 lines

Channel Members

Get Channel Members

The method returns a list of members in a channel. The list will include user metadata for members that have additional metadata stored in the database.

Method(s)

To Get Channel Members you can use the following method(s) in the Swift SDK:

fetchMembers(
    channel: String?,
    include: MemberInclude = MemberInclude(),
    filter: String? = nil,
    sort: [MembershipSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`channel`	String	Yes		Unique Channel Metadata identifier
`include`	MemberInclude	Optional	`MemberInclude()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[MembershipSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.object(.id)`, `.object(.name)`, `.object(.updated)`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

A Tuple containing an Array of PubNubMembershipMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubMembershipMetadata {
  /// The unique identifier of the associated UUID
  var uuidMetadataId: String { get }

  /// The unique identifier of the associated Channel
  var channelMetadataId: String { get }

  /// The associated UUID metadata
  var uuid: PubNubUUIDMetadata? { get set }

  /// The associated Channel metadata
  var channel: PubNubChannelMetadata? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }
show all 22 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

pubnub.fetchMembers(channel: "my_channel") { result in
  switch result {
  case let .success(response):
    print("The uuid members for the channel \(response.memberships)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
    print("Fetch Memberships request failed with error: \(error.localized### Description)")
  }
}

Set Channel Members

This method sets members in a channel.

Method(s)

To Set Channel Members you can use the following method(s) in the Swift SDK:

setMembers(
    channel metadataId: String,
    uuids members: [PubNubMembershipMetadata],
    include: MemberInclude = MemberInclude(),
    filter: String? = nil,
    sort: [MembershipSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`channel`	String	Yes		Unique Channel identifier.
`uuids`	[PubNubMembershipMetadata]	Yes		Array of `PubNubMembershipMetadata` with the `PubNubUUIDMetadata` or `uuidMetadataId` provided
`include`	MemberInclude	Optional	`MemberInclude()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[MembershipSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.object(.id)`, `.object(.name)`, `.object(.updated)`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

API limits

To learn about the maximum length of parameters used to set channel members metadata, refer to REST API docs.

Completion Handler Result

Success

A Tuple containing an Array of PubNubMembershipMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubMembershipMetadata {
  /// The unique identifier of the associated UUID
  var uuidMetadataId: String { get }

  /// The unique identifier of the associated Channel
  var channelMetadataId: String { get }

  /// The associated UUID metadata
  var uuid: PubNubUUIDMetadata? { get set }

  /// The associated Channel metadata
  var channel: PubNubChannelMetadata? { get set }

  /// The last updated timestamp for the object
  var updated: Date? { get set }
show all 22 lines

public protocol PubNubHashedPage {
  /// The hash value representing the next set of data
  var start: String? { get }

  /// The hash value representing the previous set of data
  var end: String? { get }

  /// The total count of all objects withing range
  var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

let newMembership = PubNubMembershipMetadataBase(
  uuidMetadataId: "my_user", channelMetadataId: "my_channel"
)

pubnub.setMemberships(
  channel: newMembership.channelMetadataId,
  uuids: [newMembership]
) { result in
  switch result {
  case let .success(response):
    print("The channel memberships for the uuid \(response.memberships)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
show all 18 lines

Remove Channel Members

Remove members from a Channel.

Method(s)

To Remove Channel Members you can use the following method(s) in the Swift SDK:

removeMembers(
    channel metadataId: String,
    uuids members: [PubNubMembershipMetadata],
    include: MemberInclude = MemberInclude(),
    filter: String? = nil,
    sort: [MembershipSortField] = [],
    limit: Int? = 100,
    page: PubNubHashedPage? = Page(),
    custom requestConfig: RequestConfiguration = RequestConfiguration(),
    completion: ((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?
)

Parameter	Type	Required	Default	Description
`channel`	String	Yes		Unique Channel identifier.
`uuids`	[PubNubMembershipMetadata]	Yes		Array of `PubNubMembershipMetadata` with the `PubNubUUIDMetadata` or `uuidMetadataId` provided
`include`	MemberInclude	Optional	`MemberInclude()`	Whether to include the custom field in the fetch response
`filter`	String?	Optional	`nil`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here
`sort`	[MembershipSortField]	Optional	`[]`	List of properties to sort response objects. The following properties are valid for sorting: `.object(.id)`, `.object(.name)`, `.object(.updated)`, and `.updated`.
`limit`	Int?	Optional	100	The number of objects to retrieve at a time
`page`	PubNubHashedPage?	Optional	`PubNub.Page()`	The paging object used for pagination
`custom`	RequestConfiguration	Optional	`RequestConfiguration()`	An object that allows for per-request customization of PubNub Configuration or Network Session
`completion`	`((Result<(memberships: [PubNubMembershipMetadata], next: PubNubHashedPageBase?), Error>) -> Void)?`	Optional	`nil`	The async `Result` of the method call

Completion Handler Result

Success

A Tuple containing an Array of PubNubMembershipMetadata, and the next pagination PubNubHashedPage (if one exists).

public protocol PubNubMembershipMetadata {
/// The unique identifier of the associated UUID
var uuidMetadataId: String { get }

/// The unique identifier of the associated Channel
var channelMetadataId: String { get }

/// The associated UUID metadata
var uuid: PubNubUUIDMetadata? { get set }

/// The associated Channel metadata
var channel: PubNubChannelMetadata? { get set }

/// The last updated timestamp for the object
var updated: Date? { get set }
show all 22 lines

public protocol PubNubHashedPage {
/// The hash value representing the next set of data
var start: String? { get }

/// The hash value representing the previous set of data
var end: String? { get }

/// The total count of all objects withing range
var totalCount: Int? { get }
}

Failure

An Error describing the failure.

Basic Usage

let oldMembership = PubNubMembershipMetadataBase(
  uuidMetadataId: "my_user", channelMetadataId: "my_channel"
)

pubnub.removeMembers(
  channel: oldMembership.channelMetadataId,
  uuids: [oldMembership]
) { result in
  switch result {
  case let .success(response):
    print("The channel memberships for the uuid \(response.memberships)")
    if let nextPage = response.next {
      print("The next page used for pagination: \(nextPage)")
    }
  case let .failure(error):
show all 18 lines

App Context Filtering Language Definition

The filtering language for App Context is similar to the stream filtering language.

Note the following:

Date/time properties, such as updated, must be compared to valid date/time strings formatted according to ISO 8601.
The LIKE operator supports wildcards denoted by the * character. A wildcard matches any sequence of arbitrary Unicode characters, including the empty sequence. The literal asterisk is matched when escaped using the backslash (\) character.
Values used with LIKE must be properly encoded just like any other string value. Thus, in order to escape an asterisk, the raw value must contain \\*.
The entire expression must be properly URL-encoded when used in the query string.

Custom property filtering

You can't filter by custom properties.

<expression>           ::= <and_expression> ( "||" <and_expression> )*
<and_expression>       ::= <binary_condition> ( "&&" <binary_condition> )*
<binary_condition>     ::= "!" <binary_condition> | "(" <expression> ")" | <relational_condition>
<relational_condition> ::= <property_path> <relational_operator> <value>
<property_path>        ::= <property_name> ( "." <property_name> )*
<property_name>        ::= <identifier> | "[" <string> "]"
<value>                ::= <string> | <number> | "true" | "false" | "null"

Tokens

<identifier>           ::=  <letter> | "$" | "_" ( <letter> | "$" | "_" | <digit> )*
<relational_operator>  ::= "==" | "!=" | "<=" | ">=" | "<" | ">" | "LIKE"
<string>               ::= <double_quote> ( "\" <double_quote> | "\" <special_char>
                            | "\" "u" <hex_digit> <hex_digit> <hex_digit> <hex_digit>
                            | <unicode_char> - <double_quote> - "\" )* <double_quote>
show all 26 lines

Sample object filtering operations

The following date/time comparison returns results that were modified on or after August 31st, 2019 (UTC):

updated >= "2019-08-31T00:00:00Z"

The following wildcard expression returns results whose name starts with the letter X:

name LIKE 'X*'

The following escaped wildcard expression returns results whose name contains an asterisk:

name LIKE '*\\**'

Migration guide

User​

Get Metadata for All Users​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Get User Metadata​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Set User Metadata​

Method(s)​

API limits

Completion Handler Result​

Success​

Failure​

Basic Usage​

Remove User Metadata​

Method(s)​

Basic Usage​

Channel​

Get Metadata for All Channels​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Get Channel Metadata​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Set Channel Metadata​

Method(s)​

API limits

Completion Handler Result​

Success​

Failure​

Basic Usage​

Remove Channel Metadata​

Method(s)​

Basic Usage​

Channel Memberships​

Get Channel Memberships​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Set Channel Memberships​

Method(s)​

API limits

Completion Handler Result​

Success​

Failure​

Basic Usage​

Remove Channel Memberships​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Channel Members​

Get Channel Members​

Method(s)​

Completion Handler Result​

Success​

Failure​

Basic Usage​

Set Channel Members​

Method(s)​

API limits

Completion Handler Result​

Success​

Failure​

User

Get Metadata for All Users

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Get User Metadata

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Set User Metadata

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Remove User Metadata

Method(s)

Basic Usage

Channel

Get Metadata for All Channels

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Get Channel Metadata

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Set Channel Metadata

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Remove Channel Metadata

Method(s)

Basic Usage

Channel Memberships

Get Channel Memberships

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Set Channel Memberships

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Remove Channel Memberships

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Channel Members

Get Channel Members

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Set Channel Members

Method(s)

Completion Handler Result

Success

Failure

Basic Usage

Remove Channel Members

Method(s)

Completion Handler Result

Success