App Context API for PubNub Dart SDK

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

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 realtime 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 Dart SDK:

pubnub.objects.getAllUUIDMetadata(
  {bool? includeCustomFields,
  int? limit,
  String? start,
  String? end,
  bool? includeCount,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
) 

Parameter	Type	Required	Default	Description
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`limit`	`int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCount`	`bool`	Optional	`true`	Request `IncludeCount` to be included in paginated response. By default, `IncludeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

var result = await pubnub.objects
    .getAllUUIDMetadata(includeCustomFields: true, limit: 20);

Response

{
    "status": 200,
    "data": [
        {
            "id": "uuid-1",
            "name": "John Doe",
            "externalId": null,
            "profileUrl": null,
            "email": "johndoe@pubnub.com",
            "custom": null,
            "updated": "2019-02-20T23:11:20.893755",
            "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
        },
        {
            "id": "uuid-2",
show all 27 lines

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 Dart SDK:

pubnub.objects.getUUIDMetadata(
  {String? uuid,
  Keyset? keyset,
  String? using,
  bool? includeCustomFields}
) 

Parameter	Type	Required	Default	Description
`uuid`	`String`	Optional	defaultKeyset UUID	The UUID to get the metadata for.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.

Basic Usage

var result = await pubnub.objects.getUUIDMetadata();

Response

{
    "status": 200,
    "data": {
        "id": "uuid-1",
        "name": "John Doe",
        "externalId": null,
        "profileUrl": null,
        "email": "johndoe@pubnub.com",
        "updated": "2019-02-20T23:11:20.893755",
        "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
    }
}

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 Dart SDK:

pubnub.objects.setUUIDMetadata(
  UuidMetadataInput uuidMetadataInput,
  {String? uuid,
  bool? includeCustomFields,
  Keyset? keyset,
  String? using}
)

class UuidMetadataInput {
  String? name;
  String? email;
  dynamic? custom;
  String? externalId;
  String? profileUrl;
}

Parameter	Type	Required	Default	Description
`uuidMetadataInput`	`UuidMetadataInput`	Yes		UUID metadata details. Available options include `name`,`email`,`custom`,`externalId`, and `profileUrl`. App Context filtering language doesn’t support filtering by custom properties.
`uuid`	`String`	Optional	defaultKeyset UUID	UUID to set the metadata to.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

API limits

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

Basic Usage

var uuidMetadataInput = UuidMetadataInput(
    name: 'foo',
    email: 'foo@example.domain',
    profileUrl: 'http://sample.com');
var result = await pubnub.objects.setUUIDMetadata(uuidMetadataInput);

Response

{
    "status": 200,
    "data": {
        "id": "uuid-1",
        "name": "John Doe",
        "externalId": null,
        "profileUrl": null,
        "email": "johndoe@pubnub.com",
        "updated": "2019-02-20T23:11:20.893755",
        "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
    }
}

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 Dart SDK:

pubnub.objects.removeUUIDMetadata(
  {String? uuid,
  Keyset? keyset,
  String? using}
) 

Parameter	Type	Required	Description
`uuid`	`String`	Optional	Unique UUID Metadata identifier. If not supplied, then UUID from configuration will be used.
`keyset`	`Keyset`	Optional	Override for the PubNub default keyset configuration.
`using`	`String`	Optional	Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

var result = await pubnub.objects.removeUUIDMetadata();

Response

The removeUUIDMetadata() returns RemoveUuidMetadataResult which does not have actionable data. In case of an error, an exception with error details is thrown.

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 Dart SDK:

pubnub.objects.getAllChannelMetadata(
  {int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeCount,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
)

Parameter	Type	Required	Default	Description
`limit`	`int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeCount`	`bool`	Optional	`true`	Request `IncludeCount` to be included in paginated response. By default, `IncludeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

var result = await pubnub.objects.getAllChannelMetadata();

Response

{
    "status": 200,
    "data": [
        {
            "id": "my-channel",
            "name": "My channel",
            "description": "A channel that is mine",
            "custom": null,
            "updated": "2019-02-20T23:11:20.893755",
            "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
        },
        {
            "id": "main",
            "name": "Main channel",
            "description": "The main channel",
show all 27 lines

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 Dart SDK:

pubnub.objects.getChannelMetadata(
  String channelId,
  {Keyset? keyset,
  String? using,
  bool? includeCustomFields}
) 

Parameter	Type	Required	Default	Description
`channelId`	`String`	Yes		Channel name.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.

Basic Usage

var channelMetadata = await pubnub.objects.getChannelMetadata('my_channel');

Response

{
    "status": 200,
    "data": {
        "id": "my-channel",
        "name": "My channel",
        "description": "A channel that is mine",
        "updated": "2019-02-20T23:11:20.893755",
        "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
    }
}

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 Dart SDK:

pubnub.objects.setChannelMetadata(
  String channelId,
  ChannelMetadataInput channelMetadataInput,
  {bool? includeCustomFields,
  Keyset? keyset,
  String? using}
) 

class ChannelMetadataInput {
  String? name;
  String? description;
  dynamic? custom;
}

Parameter	Type	Required	Default	Description
`channelId`	`String`	Yes		Channel name.
`channelMetadataInput`	`ChannelMetadataInput`	Yes		Channel metadata details. Available options include `name`,`description`, and `custom` App Context filtering language doesn’t support filtering by custom properties.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

API limits

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

Basic Usage

var channelMetadataInput = ChannelMetadataInput(
    name: 'Channel name', description: 'A channel that is mine');
    
var result = await pubnub.objects
    .setChannelMetadata('my_channel', channelMetadataInput);

Response

{
    "status": 200,
    "data": {
        "id": "my-channel",
        "name": "My channel",
        "description": "A channel that is mine",
        "updated": "2019-02-20T23:11:20.893755",
        "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
    }
}

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 Dart SDK:

pubnub.objects.removeChannelMetadata(
  String channelId,
  {Keyset? keyset,
  String? using}
) 

Parameter	Type	Required	Description
`channelID`	`String`	Yes	Channel name.
`keyset`	`Keyset`	Optional	Override for the PubNub default keyset configuration.
`using`	`String`	Optional	Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

var result = await pubnub.objects.removeChannelMetadata('my_channel');

Response

The removeChannelMetadata() returns RemoveChannelMetadataResult which does not have actionable data. In case of an error, an exception with error details is thrown.

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 Channel Memberships you can use the following method(s) in the Dart SDK:

pubnub.objects.getMemberships(
  {String? uuid,
  int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeChannelFields,
  bool? includeChannelCustomFields,
  bool? includeCount = true,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
) 

Parameter	Type	Required	Default	Description
`uuid`	`String`	Optional	defaultKeyset UUID	Unique UUID Metadata identifier. If not supplied, then UUID from configuration will be used.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeChannelFields`	`bool`	Optional	`false`	Include fields for channels metadata.
`includeCustomChannelFields`	`bool`	Optional	`false`	Include custom fields for channels metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

  var memberships = await pubnub.objects.getMemberships();

Response

{
    "status": 200,
    "data": [
        {
            "channel": {
                "id": "my-channel",
                "name": "My channel",
                "description": "A channel that is mine",
                "custom": null,
                "updated": "2019-02-20T23:11:20.893755",
                "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
            },
            "custom": {
                "starred": false
            },
show all 38 lines

Set Channel Memberships

Set channel memberships for a UUID.

Method(s)

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

pubnub.objects.setMemberships(
  List<MembershipMetadataInput> setMetadata,
  {String? uuid,
  int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeChannelFields,
  bool? includeChannelCustomFields,
  bool? includeCount = true,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
)
show all 20 lines

Parameter	Type	Required	Default	Description
`setMetadata`	`List<MembershipMetadataInput>`	Yes		The memberships to be set.
`uuid`	`String`	Optional		Unique UUID Metadata identifier. If not supplied, then UUID from configuration will be used.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeChannelFields`	`bool`	Optional	`false`	Include fields for channels metadata.
`includeCustomChannelFields`	`bool`	Optional	`false`	Include custom fields for channels metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

API limits

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

Basic Usage

  var setMetadata = [
    MembershipMetadataInput('my_channel', custom: {'starred': 'false'})
  ];

  var result = await pubnub.objects
      .setMemberships(setMetadata, includeChannelFields: true);

Response

{
    "status": 200,
    "data": [
        {
            "channel": {
              "id": "my-channel",
              "name": "My channel",
              "description": "A channel that is mine",
              "custom": null,
              "updated": "2019-02-20T23:11:20.893755",
              "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
            },
            "custom": {
                "starred": false
            },
show all 38 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 Dart SDK:

pubnub.objects.removeMemberships(
  Set<String> channelIds,
  {String? uuid,
  int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeChannelFields,
  bool? includeChannelCustomFields,
  bool? includeCount = true,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
)

Parameter	Type	Required	Default	Description
`channelIds`	`Set<String>`	Yes		List of channels to remove from membership.
`uuid`	`String`	Optional		Unique UUID Metadata identifier. If not supplied, then UUID from configuration will be used.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeChannelFields`	`bool`	Optional	`false`	Include fields for channels metadata.
`includeCustomChannelFields`	`bool`	Optional	`false`	Include custom fields for channels metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

  var result = await pubnub.objects.removeMemberships({'my_channel', 'main_channel'});

  // for other uuid
  var result = await pubnub.objects.removeMemberships({'my_channel'}, uuid: 'uuid1');

Response

{
    "status": 200,
    "data": [
        {
            "channel": {
              "id": "my-channel",
              "name": "My channel",
              "description": "A channel that is mine",
              "custom": null,
              "updated": "2019-02-20T23:11:20.893755",
              "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
            },
            "custom": {
                "starred": false
            },
show all 38 lines

Manage Channel Memberships

Manage a user's channel memberships.

Method(s)

To Manage Memberships you can use the following method(s) in the Dart SDK:

pubnub.objects.manageMemberships(
  List<MembershipMetadataInput> setMetadata,
  Set<String> removeChannelIds,
  {String? uuid,
  int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeChannelFields,
  bool? includeChannelCustomFields,
  bool? includeCount,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
show all 21 lines

Parameter	Type	Required	Default	Description
`setMetadata`	`List<MembershipMetadataInput>`	Yes		The memberships to be set.
`channelIds`	`Set<String>`	Yes		List of channels to remove from membership.
`uuid`	`String`	Optional		Unique UUID Metadata identifier. If not supplied, then UUID from configuration will be used.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeChannelFields`	`bool`	Optional	`false`	Include fields for channels metadata.
`includeCustomChannelFields`	`bool`	Optional	`false`	Include custom fields for channels metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

  var setMetadata = [
    MembershipMetadataInput('my_channel', custom: {'starred': 'false'})
  ];
  var result =
      await pubnub.objects.manageMemberships(setMetadata, {'main_channel'});

Response

{
    "status": 200,
    "data": [
        {
            "channel": {
              "id": "my-channel",
              "name": "My channel",
              "description": "A channel that is mine",
              "custom": null,
              "updated": "2019-02-20T23:11:20.893755",
              "eTag": "RTc1NUQwNUItREMyNy00Q0YxLUJCNDItMEZDMTZDMzVCN0VGCg=="
            },
            "custom": {
                "starred": false
            },
show all 38 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 Dart SDK:

pubnub.objects.getChannelMembers(
  String channelId,
  {int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeUUIDFields,
  bool? includeUUIDCustomFields,
  bool? includeCount = true,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
) 

Parameter	Type	Required	Default	Description
`channelId`	`String`	yes		Channel name.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeUUIDFields`	Boolean	Optional	`false`	Include fields for UUIDs metadata.
`includeUUIDCustomFields`	Boolean	Optional	`false`	Include custom fields for UUIDs metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

  var channelMembers = await pubnub.objects.getChannelMembers('my_channel');

Response

{
  "status": 200,
  "data": [
    {
      "uuid": {
        "id": "uuid-1",
        "name": "John Doe",
        "externalId": null,
        "profileUrl": null,
        "email": "someone@pubnub.com",
        "custom": null,
        "updated": "2019-02-20T23:11:20.893755",
        "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
      },
      "custom": {
show all 41 lines

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 Dart SDK:

pubnub.objects.setChannelMembers(
  String channelId,
  List<ChannelMemberMetadataInput> setMetadata,
  {int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeUUIDFields,
  bool? includeUUIDCustomFields,
  bool? includeCount,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
)
show all 20 lines

Parameter	Type	Required	Default	Description
`channelId`	`String`	Yes		Channel name.
`channelMetadataInput`	`ChannelMetadataInput`	Yes		The metadata to be added.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeUUIDFields`	Boolean	Optional	`false`	Include fields for UUIDs metadata.
`includeUUIDCustomFields`	Boolean	Optional	`false`	Include custom fields for UUIDs metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

API limits

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

Basic Usage

  var setMetadata = [
    ChannelMemberMetadataInput('myUUID', custom: {'role': 'admin'})
  ];
  var result =
      await pubnub.objects.setChannelMembers('my_channel', setMetadata);

Response

{
    "status": 200,
    "data": [
        {
            "uuid": {
                "id": "uuid-1",
                "name": "John Doe",
                "externalId": null,
                "profileUrl": null,
                "email": "johndoe@pubnub.com",
                "custom": null,
                "updated": "2019-02-20T23:11:20.893755",
                "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
            },
            "custom": {
show all 41 lines

Remove Channel Members

Remove members from a Channel.

Method(s)

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

pubnub.objects.removeChannelMembers(
  String channelId,
  Set<String> uuids,
  {int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeUUIDFields,
  bool? includeUUIDCustomFields,
  bool? includeCount,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
) 

Parameter	Type	Required	Default	Description
`channelId`	`String`	Yes		Channel name.
`uuids`	`Set<String>`	Yes		UUIDs to remove from the channel.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeUUIDFields`	Boolean	Optional	`false`	Include fields for UUIDs metadata.
`includeUUIDCustomFields`	Boolean	Optional	`false`	Include custom fields for UUIDs metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

  var result = await pubnub.objects
      .removeChannelMembers('my_channel', {'uuid-1', 'uuid-2'});

Response

{
    "status": 200,
    "data": [
        {
            "uuid": {
                "id": "uuid-1",
                "name": "John Doe",
                "externalId": null,
                "profileUrl": null,
                "email": "johndoe@pubnub.com",
                "custom": null,
                "updated": "2019-02-20T23:11:20.893755",
                "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
            },
            "custom": {
show all 41 lines

Manage Channel Members

Set and Remove channel memberships for a user.

Method(s)

To Manage Channel Members you can use the following method(s) in the Dart SDK:

pubnub.objects.manageChannelMembers(
  String channelId,
  List<ChannelMemberMetadataInput> setMetadata,
  Set<String> removeMemberUuids,
  {int? limit,
  String? start,
  String? end,
  bool? includeCustomFields,
  bool? includeUUIDFields,
  bool? includeUUIDCustomFields,
  bool? includeCount = true,
  String? filter,
  Set<String>? sort,
  Keyset? keyset,
  String? using}
show all 21 lines

Parameter	Type	Required	Default	Description
`channelId`	`String`	Yes		Channel name.
`setMetadata`	`List<ChannelMemberMetadataInput>`	Yes		The metadata to set.
`removeMemberUuids`	`Set<String>`	Yes		UUIDs to remove from the channel.
`limit`	`Int`	Optional	100	The number of objects to retrieve at a time.
`start`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for forward pagination, it fetches the next page, allowing you to continue from where you left off.
`end`	`String`	Optional		Random string returned from the server, indicating a specific position in a data set. Used for backward pagination, it fetches the previous page, enabling access to earlier data. Ignored if the `start` parameter is supplied.
`includeCustomFields`	`bool`	Optional	`false`	Whether to include the `Custom` field in the fetch response.
`includeUUIDFields`	Boolean	Optional	`false`	Include fields for UUIDs metadata.
`includeUUIDCustomFields`	Boolean	Optional	`false`	Include custom fields for UUIDs metadata.
`includeCount`	`bool`	Optional	`false`	Request `IncludeCount` to be included in paginated response. By default, `includeCount` is omitted.
`filter`	`String`	Optional	`null`	Expression used to filter the results. Only objects whose properties satisfy the given expression are returned. The filter language is defined here.
`sort`	`Set<String>`	Optional		List of properties to sort by. Available options are `id`, `name`, and `updated`. Use `asc` or `desc` to specify sort direction.
`keyset`	`Keyset`	Optional		Override for the PubNub default keyset configuration.
`using`	`String`	Optional		Keyset name from the `keysetStore` to be used for this method call.

Basic Usage

  var setMetadata = [
    ChannelMemberMetadataInput('uuidToSet', custom: {'role': 'admin'})
  ];
  var result = await pubnub.objects
      .manageChannelMembers('my_channel', setMetadata, {'uuidToRemove'});

Response

{
    "status": 200,
    "data": [
        {
            "uuid": {
                "id": "uuid-1",
                "name": "John Doe",
                "externalId": null,
                "profileUrl": null,
                "email": "johndoe@pubnub.com",
                "custom": null,
                "updated": "2019-02-20T23:11:20.893755",
                "eTag": "MDcyQ0REOTUtNEVBOC00QkY2LTgwOUUtNDkwQzI4MjgzMTcwCg=="
            },
            "custom": {
show all 41 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 '*\\**'

User​

Get Metadata for All Users​

Method(s)​

Basic Usage​

Response​

Get User Metadata​

Method(s)​

Basic Usage​

Response​

Set User Metadata​

Method(s)​

API limits

Basic Usage​

Response​

Remove User Metadata​

Method(s)​

Basic Usage​

Response​

Channel​

Get Metadata for All Channels​

Method(s)​

Basic Usage​

Response​

Get Channel Metadata​

Method(s)​

Basic Usage​

Response​

Set Channel Metadata​

Method(s)​

API limits

Basic Usage​

Response​

Remove Channel Metadata​

Method(s)​

Basic Usage​

Response​

Channel Memberships​

Get Channel Memberships​

Method(s)​

Basic Usage​

Response​

Set Channel Memberships​

Method(s)​

API limits

Basic Usage​

Response​

Remove Channel Memberships​

Method(s)​

Basic Usage​

Response​

Manage Channel Memberships​

Method(s)​

Basic Usage​

Response​

Channel Members​

Get Channel Members​

Method(s)​

Basic Usage​

Response​

Set Channel Members​

Method(s)​

API limits

Basic Usage​

Response​

Remove Channel Members​

Method(s)​

Basic Usage​

Response​

Manage Channel Members​

Method(s)​

Basic Usage​

Response​

App Context Filtering Language Definition​

Custom property filtering

Sample object filtering operations​

User

Get Metadata for All Users

Method(s)

Basic Usage

Response

Get User Metadata

Method(s)

Basic Usage

Response

Set User Metadata

Method(s)

Basic Usage

Response

Remove User Metadata

Method(s)

Basic Usage

Response

Channel

Get Metadata for All Channels

Method(s)

Basic Usage

Response

Get Channel Metadata

Method(s)

Basic Usage

Response

Set Channel Metadata

Method(s)

Basic Usage

Response

Remove Channel Metadata

Method(s)

Basic Usage

Response

Channel Memberships

Get Channel Memberships

Method(s)

Basic Usage

Response

Set Channel Memberships

Method(s)

Basic Usage

Response

Remove Channel Memberships

Method(s)

Basic Usage

Response

Manage Channel Memberships

Method(s)

Basic Usage

Response

Channel Members

Get Channel Members

Method(s)

Basic Usage

Response

Set Channel Members

Method(s)

Basic Usage

Response

Remove Channel Members

Method(s)

Basic Usage

Response

Manage Channel Members

Method(s)

Basic Usage

Response

App Context Filtering Language Definition

Sample object filtering operations