Updating a Channel

There are two ways to update a channel using the Stream API - a partial or full update. A partial update will retain any custom key-value data, whereas a complete update is going to remove any that are unspecified in the API request.

Partial Update

A partial update can be used to set and unset specific fields when it is necessary to retain additional custom data fields on the object. AKA a patch style update.

// Here's a channel with some custom field data that might be useful
val channelClient = client.channel(channelType = "messaging", channelId = "general")

channelClient.create(
  members = listOf("thierry", "tomasso"),
  extraData = mapOf(
    "source" to "user",
    "source_detail" to mapOf("user_id" to 123),
    "channel_detail" to mapOf(
      "topic" to "Plants and Animals",
      "rating" to "pg"
    )
  )
).execute()

// let's change the source of this channel
channelClient.updatePartial(set = mapOf("source" to "system")).execute()

// since it's system generated we no longer need source_detail
channelClient.updatePartial(unset = listOf("source_detail")).execute()

// and finally update one of the nested fields in the channel_detail
channelClient.updatePartial(set = mapOf("channel_detail.topic" to "Nature")).execute()

// and maybe we decide we no longer need a rating
channelClient.updatePartial(unset = listOf("channel_detail.rating")).execute()

// Here's a channel with some custom field data that might be useful
const channel = client.channel(type, id , {
 source: "user",
 source_detail:{ user_id: 123 },
 channel_detail:{ topic: "Plants and Animals", rating: "pg" }
})

// let's change the source of this channel
await channel.updatePartial({ set:{ source: "system" } });

// since it's system generated we no longer need source_detail
await channel.updatePartial({ unset: ["source_detail"] });

// and finally update one of the nested fields in the channel_detail
await channel.updatePartial({ set: { "channel_detail.topic": "Nature" } });

// and maybe we decide we no longer need a rating
await channel.updatePartial({ unset: ["channel_detail.rating"] });

// Here's a channel with some custom field data that might be useful
var channel = client.channel(type, id: id, extraData: {
 "source": "user",
 "source_detail" :{ "user_id": 123 },
 "channel_detail" :{ "topic": "Plants and Animals", "rating": "pg" }
});

// let's change the source of this channel
await channel.updatePartial(set: { "source": "system" });

// since it's system generated we no longer need source_detail
await channel.updatePartial(unset: ["source_detail"]);

// and finally update one of the nested fields in the channel_detail
await channel.updatePartial(set: { "channel_detail.topic": "Nature" });

// and maybe we decide we no longer need a rating
await channel.updatePartial(unset: ["channel_detail.rating"]);

# Here's a channel with some custom field data that might be useful
channel = client.channel(type, id , {
 "source": "user",
 "source_detail":{ "user_id": 123 },
 "channel_detail":{ "topic": "Plants and Animals", "rating": "pg" }
})

# let's change the source of this channel
channel.update_partial(to_set={ "source": "system" });

# since it's system generated we no longer need source_detail
channel.update_partial(to_unset=["source_detail"]);

# and finally update one of the nested fields in the channel_detail
channel.update_partial(to_set={ "channel_detail.topic": "Nature" });

# and maybe we decide we no longer need a rating
channel.update_partial(to_unset=["channel_detail.rating"]);

// Here's a channel with some custom field data that might be useful 
$channel = $client->Channel('messaging', 'thierry-jenny', 
['source'=>'user','source_detail'=>['user_id'=>123], 
'channel_detail'=>['topic'=>'Plants and Animals', 'rating'=> 'pg'] ]); 

// let's change the source of this channel 
$response = $channel->updatePartial(['source' => 'system']);

// since it's system generated we no longer need source_detail 
$response = $channel->updatePartial(null,['source_detail']);

// and finally update one of the nested fields in the channel_detail 
$response = $channel->updatePartial(['source_detail'=> ['topic' => 'Nature']]);

// and maybe we decide we no longer need a rating 
$response = $channel->updatePartial(null,['source_detail'=>'topic']);

// Create a channel with some custom data
var req = new ChannelGetRequest
{
  Data = new ChannelRequest
  {
    CreatedBy = new UserRequest { Id = createdByUserId },
  },
};

req.Data.SetData("source", "user");
req.Data.SetData("source_detail", new Dictionary<string, object> { { "user_id", 123} });
req.Data.SetData("channel_detail", new Dictionary<string, object>
{
  { "topic", "Plants and Animals"},
  { "rating", "pg" }
});
var channelResp = await channelClient.GetOrCreateAsync("messaging", "general", req);

// Remove channel detail rating, and set a new source
var req = new PartialUpdateChannelRequest
{

  Unset = new List<string> { "channel_detail.rating" },
  Set = new Dictionary<string, object> { { "source", "system" } }
};
await channelClient.PartialUpdateAsync(channelResp.Channel.Type, channelResp.Channel.Id, req);

// Create a channel with some custom field data that might be useful
FChannelProperties Props = FChannelProperties{Type, Id};

// Set extra data using dynamic JSON. You'd more likely want to use statically typed structs.
Props.ExtraData.SetString(TEXT("source"), TEXT("user"));
const TSharedRef<FJsonObject> SourceDetail = MakeShared<FJsonObject>();
SourceDetail->SetNumberField(TEXT("user_id"), 123);
Props.ExtraData.SetJsonValue(TEXT("source_detail"), MakeShared<FJsonValueObject>(SourceDetail));
const TSharedRef<FJsonObject> ChannelDetail = MakeShared<FJsonObject>();
ChannelDetail->SetStringField(TEXT("topic"), TEXT("Plants and Animals"));
ChannelDetail->SetStringField(TEXT("rating"), TEXT("pg"));
Props.ExtraData.SetJsonValue(TEXT("source_detail"), MakeShared<FJsonValueObject>(ChannelDetail));
Client->CreateChannel(
  Props,
  [](UChatChannel* Channel)
  {
    // let's change the source of this channel
    const TSharedRef<FJsonObject> NewSource = MakeShared<FJsonObject>();
    NewSource->SetStringField(TEXT("source"), TEXT("system"));
    Channel->PartialUpdate(NewSource);

    // since it's system generated we no longer need source_detail
    Channel->PartialUpdate({}, {TEXT("source_detail")});

    // and finally update one of the nested fields in the channel_detail
    const TSharedRef<FJsonObject> NewTopic = MakeShared<FJsonObject>();
    NewSource->SetStringField(TEXT("channel_detail.topic"), TEXT("Nature"));
    Channel->PartialUpdate(NewSource);

    // and maybe we decide we no longer need a rating
    Channel->PartialUpdate({}, {TEXT("channel_detail.rating")});
  });

resp, err := c.CreateChannel(ctx, "messaging", "general", "thierry", map[string]interface{}{
	"source": "user",
	"source_detail": map[string]interface{}{"user_id": "123"},
	"channel_detail": map[string]interface{}{"topic": "Plants and Animals", "rating": "pg"},
})

channel := resp.Channel

// let's change the source of this channel
channel.PartialUpdate(ctx, PartialUpdate{
	Set: map[string]interface{}{
		"source": "system",
	},
})

// since it's system generated we no longer need source_detail
channel.PartialUpdate(ctx, PartialUpdate{
	Unset: []string{"source_detail"},
})

// and finally update one of the nested fields in the channel_detail
channel.PartialUpdate(ctx, PartialUpdate{
	Set: map[string]interface{}{
		"channel_detail.topic": "Nature",
	},
})

// and maybe we decide we no longer need a rating
channel.PartialUpdate(ctx, PartialUpdate{
	Unset: []string{"channel_detail.rating"},
})

# Here's a channel with some custom field data that might be useful
channel = client.channel(type, id , data: {
 "source" => "user",
 "source_detail" => { "user_id" => 123 },
 "channel_detail" => { "topic" => "Plants and Animals", "rating" => "pg" }
})

# let's change the source of this channel
channel.update_partial({ "source" => "system" });

# since it's system generated we no longer need source_detail
channel.update_partial(nil, ["source_detail"]);

# and finally update one of the nested fields in the channel_detail
channel.update_partial({ "channel_detail.topic" => "Nature" });

# and maybe we decide we no longer need a rating
channel.update_partial(nil, ["channel_detail.rating"]);

public async Task PartialUpdate()
{
  var channel = await Client.GetOrCreateChannelWithIdAsync(ChannelType.Messaging, channelId: "my-channel-id");

  var setClanInfo = new ClanData
  {
    MaxMembers = 50,
    Name = "Wild Boards",
    Tags = new List<string>
    {
      "Competitive",
      "Legendary",
    }
  };

  var setFields = new Dictionary<string, object>();

  // Set custom values
  setFields.Add("frags", 5);
  // Set custom arrays
  setFields.Add("items", new[] { "sword", "shield" });
  // Set custom class objects
  setFields.Add("clan_info", setClanInfo);

  // Send data
  await channel.UpdatePartialAsync(setFields);

  // Data is now available via CustomData property
  var frags = channel.CustomData.Get<int>("frags");
  var items = channel.CustomData.Get<List<string>>("items");
  var clanInfo = channel.CustomData.Get<ClanData>("clan_info");
}

// Example class with data that you can assign as Channel custom data
private class ClanData
{
  public int MaxMembers;
  public string Name;
  public List<string> Tags;
}

// Android SDK

// Here's a channel with some custom field data that might be useful
ChannelClient channelClient = client.channel("messaging", "general");

List<String> members = Arrays.asList("thierry", "tommaso");

Map<String, String> channelDetail = new HashMap<>();
channelDetail.put("topic", "Plants and Animals");
channelDetail.put("rating", "pg");

Map<String, Integer> userId = new HashMap<>();
userId.put("user_id", 123);

Map<String, Object> extraData = new HashMap<>();
extraData.put("source", "user");
extraData.put("source_detail", userId);
extraData.put("channel_detail", channelDetail);

channelClient.create(members, extraData).execute();

// let's change the source of this channel
Map<String, Object> setField = Collections.singletonMap("source", "system");
channelClient.updatePartial(setField, emptyList()).execute();

// since it's system generated we no longer need source_detail
List<String> unsetField = Collections.singletonList("source_detail");
channelClient.updatePartial(emptyMap(), unsetField).execute();

// and finally update one of the nested fields in the channel_detail
Map<String, Object> setNestedField = Collections.singletonMap("channel_detail.topic", "Nature");
channelClient.updatePartial(setNestedField, emptyList()).execute();

// and maybe we decide we no longer need a rating
List<String> unsetNestedField = Collections.singletonList("channel_detail.rating");
channelClient.updatePartial(emptyMap(), unsetNestedField).execute();

// Backend SDK
Channel.partialUpdate("messaging", "general")
  .setValue("source", "system")
  .setValue("channel_detail.topic", "Nature")
  .user(user)
  .unsetValue("source_detail")
  .request()
  .getChannel();

channelController.partialChannelUpdate(extraData: [pinnedKey: true]) { error in
  if let error = error {
   self.rootViewController.presentAlert(title: "Couldn't pin channel \(cid)", message: "\(error)")
  }
}

// let's change the source of this channel
channelController.partialChannelUpdate(unsetProperties: ["source_detail"])
        
// let's change the source of this channel
channelController.partialChannelUpdate(extraData:["source": "system"])

// since it's system generated we no longer need source_detail
channelController.partialChannelUpdate(unsetProperties: ["source_detail"])

// and finally update one of the nested fields in the channel_detail
channelController.partialChannelUpdate(extraData:["channel_detail.topic": "Nature"])

Full Update (overwrite)

The update function updates all of the channel data. Any data that is present on the channel and not included in a full update will be deleted.

val channelClient = client.channel("messaging", "general")

channelClient.update(
  message = Message(
    text = "Thierry changed the channel color to green"
  ),
  extraData = mapOf(
    "name" to "myspecialchannel",
    "color" to "green",
  ),
).enqueue { result ->
  if (result.isSuccess) {
    val channel = result.data()
  } else {
    // Handle result.error()
  }
}

const update = await channel.update(
  {
    name: 'myspecialchannel',
    color: 'green',
  },
  { text: 'Thierry changed the channel color to green', user_id: "Thierry" },
);

await channel.update({
 "name": "myspecialchannel",
 "color": "green",
}, Message(text: "Thierry changed the channel color to green"));

$update = $channel->update(
	[
		'name'  => 'myspecialchannel', 
		'color'	 => 'green'
	],
	[ 
		'text' => 'Thierry changed the channel color to green',
		'user_id' => 'thierry'
	]
);

import Stream Chat

let controller = chatClient.channelController(for: .init(type: .messaging, id: "general"))

controller.updateChannel(name: "My special channel", imageURL: nil, team: nil, extraData: .defaultValue) { error in
  if let error = error {
    // handle errors
    print(error)
  }
}

channel.update(
  {
    "name": "myspecialchannel",
    "color": "green",
  },
  update_message={
    "text": "Thierry changed the channel color to green",
    "user_id": "Thierry",
  },
)

FAdditionalFields Data;
Data.SetString(TEXT("name"), TEXT("myspecialchannel"));
Data.SetString(TEXT("color"), TEXT("green"));
const FMessage Message{TEXT("Thierry changed the channel color to green")};
Channel->Update(Data, Message);

var updatedChannel = new ChannelUpdateRequest { Data = new ChannelRequest() };
updatedChannel.Data.SetData("name", "myspecialchannel");
updatedChannel.Data.SetData("color", "green");
updatedChannel.Message = new MessageRequest { Text = "Thierry changed the channel color to green", UserId = "thierry" }

await channelClient.UpdateAsync(channel.Type, channel.Id, updatedChannel);

channel.Update(ctx, map[string]interface{}{"color": "green"},
 &Message{
 	Text: "Thierry changed the channel color to green",
 	User: &User{ID: "thierry"},
 },
)

channel.update(
  {
    "name" => "myspecialchannel",
    "color" => "green",
  },
  {
    "text" => "Thierry changed the channel color to green",
    "user_id" => "Thierry",
  },
)

var updateRequest = new StreamUpdateOverwriteChannelRequest
{
  Name = "New name",
  CustomData = new StreamCustomDataRequest
  {
    {"my-custom-int", 12},
    {"my-custom-array", new string[]{"one", "two"}}
  }
};

// This request will have all channel data removed except what is being passed in the request
await channel.UpdateOverwriteAsync(updateRequest);

// You can also pass an instance of channel to the request constructor to have all of the date copied over
// This way you alter only the fields you wish to change
var updateRequest2 = new StreamUpdateOverwriteChannelRequest(channel)
{
  Name = "Brand new name"
};

// This will update only the name because all other data was copied over
await channel.UpdateOverwriteAsync(updateRequest2);

// Android SDK
ChannelClient channelClient = client.channel("messaging", "general");

Map<String, Object> channelData = new HashMap<>();
channelData.put("name", "myspecialchannel");
channelData.put("color", "green");
Message updateMessage = new Message();
updateMessage.setText("Thierry changed the channel color to green");

channelClient.update(updateMessage, channelData).enqueue(result -> {
  if (result.isSuccess()) {
    Channel channel = result.data();
  } else {
    // Handle result.error()
  }
 });
 

// Backend SDK
MessageRequestObject msg = MessageRequestObject
  .builder()
    .text("Thierry changed the channel color to green")
  .build();

Channel.update("messaging", "general")
  .message(msg)
  .data(ChannelRequestObject.builder()
   .additionalField("name", "myspecialchannel")
   .additionalField("color", "green")
   .build())
  .request();

Request Params

Name	Type	Description	Optional
channel data	object	Object with the new channel information. One special field is “frozen”. Setting this field to true will freeze the channel. Read more about freezing channels in “Freezing Channels”
text	object	Message object allowing you to show a system message in the Channel that something changed.	Yes

Updating a channel using these methods cannot be used to add or remove members. For this, you must use specific methods for adding/removing members, more information can be found here.

Watching a Channel

Updating Channel Members