Using the REST API
LiveObjects provides a comprehensive REST API that allows you to directly work with objects without using a client SDK.
Authentication
View the REST API authentication documentation for details on how to authenticate your requests.
To use LiveObjects, an API key must have at least the object-subscribe
capability. With only this capability, clients will have read-only access, preventing them from publishing operations.
In order to create or update objects, make sure your API key includes both object-subscribe
and object-publish
capabilities to allow full read and write access.
Data values
When working with objects via the REST API, primitive types and object references are included in request and response bodies under data
fields.
The key in the data
object indicates the type of the value:
{ "data": { "number" : 42 }}
{ "data": { "string" : "LiveObjects is awesome" }}
{ "data": { "boolean" : true }}
{ "data": { "bytes": "TGl2ZU9iamVjdHMgaXMgYXdlc29tZQo=" }}
{ "data": { "objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669" }}
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Fetching objects
List objects
GET rest.ably.io/channels/<channelId>
/objects
Fetch a flat list of objects on the channel:
curl -X GET "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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The response includes the IDs of the objects on the channel:
[
"counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669"
"counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"root",
]
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Including values
To include values of the objects in the response, set the values=true
query parameter:
curl -X GET "https://rest.ably.io/channels/my-channel/objects?values=true" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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[
{
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"counter": {
"data": {
"number": 10
}
}
},
{
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter": {
"data": {
"number": 5
}
}
},
{
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"entries": {
"down": {
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669"
}
},
"up": {
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269"
}
}
}
}
},
{
"objectId": "root",
"map": {
"entries": {
"votes": {
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519"
}
}
}
}
}
]
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Including metadata
You can optionally include additional object metadata with the metadata
query option:
curl -X GET "https://rest.ably.io/channels/my-channel/objects?values=true&metadata=true" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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[
{
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"counter": {
"data": {
"number": 10
}
},
"siteTimeserials": {
"e02": "01745828651671-000@e025VxXLABoR0C19591332:000"
},
"tombstone": false
},
{
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter": {
"data": {
"number": 5
}
},
"siteTimeserials": {
"e02": "01745828645271-000@e025VxXLABoR0C19591332:000"
},
"tombstone": false
},
{
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"mapSemantics": "LWW",
"entries": {
"down": {
"timeserial": "01745828651671-000@e025VxXLABoR0C19591332:001",
"tombstone": false,
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669"
}
},
"up": {
"timeserial": "01745828645271-000@e025VxXLABoR0C19591332:001",
"tombstone": false,
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269"
}
}
}
},
"siteTimeserials": {
"e02": "01745828651671-000@e025VxXLABoR0C19591332:001"
},
"tombstone": false
},
{
"objectId": "root",
"map": {
"mapSemantics": "LWW",
"entries": {
"votes": {
"timeserial": "01745828596522-000@e025VxXLABoR0C19591332:001",
"tombstone": false,
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519"
}
}
}
},
"siteTimeserials": {
"e02": "01745828596522-000@e025VxXLABoR0C19591332:001"
},
"tombstone": false
}
]
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Pagination
The response can be paginated with cursor
and limit
query params using relative links.
Use the limit
query parameter to specify the maximum number of objects to include in the response:
curl -v -X GET "https://rest.ably.io/channels/my-channel/objects?values=true&limit=2" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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[
{
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"counter": {
"data": {
"number": 10
}
}
},
{
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter": {
"data": {
"number": 5
}
}
}
]
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The response includes Link
headers which provide relative links to the first, current and next pages of the response:
link: </channels/my-channel/objects?limit=2&values=true>; rel="first"
link: </channels/my-channel/objects?limit=2&values=true>; rel="current"
link: </channels/my-channel/objects?cursor=map%3Aja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek%401745828596519&limit=2&values=true>; rel="next"
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The list objects endpoints returns objects ordered lexicographically by object ID. The object ID of the first object in the next page is used as the cursor
value for the next request:
curl -X GET "https://rest.ably.io/channels/my-channel/objects?cursor=map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519&limit=2&values=true" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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[
{
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"entries": {
"down": {
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669"
}
},
"up": {
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269"
}
}
}
}
},
{
"objectId": "root",
"map": {
"entries": {
"votes": {
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519"
}
}
}
}
}
]
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Get objects
GET rest.ably.io/channels/<channelId>
/objects/<objectId>
Get a single object
To fetch a single object on the channel, specify the object ID in the URL path:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/root" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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The response contains a single object referencing any nested child objects by their object ID:
{
"objectId": "root",
"map": {
"entries": {
"votes": {
"data": { "objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519" }
}
}
}
}
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To fetch the objects on the channel in a tree structure use the children
query parameter:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/root?children=true" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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The response includes the object tree starting from the specified object ID. Nested child objects are resolved and their values are included in the response:
{
"objectId": "root",
"map": {
"entries": {
"votes": {
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"entries": {
"down": {
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"counter": {
"data": {
"number": 10
}
}
}
},
"up": {
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter": {
"data": {
"number": 5
}
}
}
}
}
}
}
}
}
}
}
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Use root
as the object ID in the URL to get the full object tree, or any other object ID to fetch a subset of the tree using that object as the entrypoint.
Including metadata
You can optionally include additional object metadata for all objects included in the response with the metadata
query option:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/root?children=true&metadata=true" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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{
"objectId": "root",
"map": {
"mapSemantics": "LWW",
"entries": {
"votes": {
"timeserial": "01745828596522-000@e025VxXLABoR0C19591332:001",
"tombstone": false,
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"mapSemantics": "LWW",
"entries": {
"down": {
"timeserial": "01745828651671-000@e025VxXLABoR0C19591332:001",
"tombstone": false,
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"counter": {
"data": {
"number": 10
}
},
"siteTimeserials": {
"e02": "01745828651671-000@e025VxXLABoR0C19591332:000"
},
"tombstone": false
}
},
"up": {
"timeserial": "01745828645271-000@e025VxXLABoR0C19591332:001",
"tombstone": false,
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter": {
"data": {
"number": 5
}
},
"siteTimeserials": {
"e02": "01745828645271-000@e025VxXLABoR0C19591332:000"
},
"tombstone": false
}
}
}
},
"siteTimeserials": {
"e02": "01745828651671-000@e025VxXLABoR0C19591332:001"
},
"tombstone": false
}
}
}
},
"siteTimeserials": {
"e02": "01745828596522-000@e025VxXLABoR0C19591332:001"
},
"tombstone": false
}
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Pagination
The tree-structured response can be paginated using the limit
parameter to specify the maximum number of objects to include in the response. If a nested child object exists which cannot be included in the response because the limit has been reached, it will be included by reference to its object ID rather than its value:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/root?children=true&limit=1" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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{
"objectId": "root",
"map": {
"entries": {
"votes": {
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519"
}
}
}
}
}
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To obtain the next page, make a subsequent query specifying the referenced object ID as the entrypoint:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519?children=true&limit=1" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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{
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"entries": {
"down": {
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669"
}
},
"up": {
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269"
}
}
}
}
}
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Cyclic references
When using the children
query parameter, cyclic references in the object tree will be included as a reference to the object ID rather than including the same object in the response more than once.
For example, if we created a cycle in the object tree by adding a reference to the root object in the votes
LiveMap
instance with the following operation:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "MAP_SET",
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"data": {"key": "myRoot", "value": {"objectId": "root"}}
}'
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The response will handle the cyclic reference by including the myRoot
key in the response as a reference to the object ID of the root object:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/root?children=true" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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{
"objectId": "root",
"map": {
"entries": {
"votes": {
"data": {
"objectId": "map:ja7cjMUib2LmJKTRdoGAG9pbBYCnkMObAVpmojCOmek@1745828596519",
"map": {
"entries": {
"down": {
"data": {
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"counter": {
"data": {
"number": 10
}
}
}
},
"up": {
"data": {
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter": {
"data": {
"number": 5
}
}
}
},
"myRoot": {
"data": {
"objectId": "root"
}
}
}
}
}
}
}
}
}
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GET rest.ably.io/channels/<channelId>
/objects/<objectId>
/compact
To fetch the objects on the channel in a tree structure in a concise format:
curl -X GET "https://rest.ably.io/channels/my-channel/objects/root/compact" \
-u <loading API key, please wait>
-H "Content-Type: application/json"
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The response includes a compact representation of the object tree that is easy to read:
{
"votes": {
"up": 5,
"down": 10
}
}
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When using the compact format:
LiveMap
instances will be represented as a JSON representation of its entriesLiveCounter
instances will be represented as its numeric value
Cyclic references are handled in the same way as for the tree-structured response. In the example below, the myRoot
key references the root object, which is already included in the response:
{
"votes": {
"up": 5,
"down": 10,
"myRoot": { "objectId": "root" }
}
}
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The compact format inlines object ID references under the objectId
key, allowing references to other objects to be differentiated from string values.
Publishing operations
POST rest.ably.io/channels/<channelId>
/objects
All operations are published to the same endpoint. The request body specifies:
- The type of operation to publish
- The object(s) to which the operation should be applied
- The operation payload
The request body is of the form:
{
"operation": "<operationType>",
"objectId": "<objectId>",
"path": "<path>",
"data": "<data>"
}
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The operationType
is a string that specifies the type of operation to publish and must be one of:
MAP_CREATE
MAP_SET
MAP_REMOVE
COUNTER_CREATE
COUNTER_INC
Either the objectId
or path
fields are used to specify the target object(s) for the operation.
The operation payload is provided in the data
in accordance with the specified operation type.
To perform operations on a specific object instance, you need to provide its object ID in the request body:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "COUNTER_INC",
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"data": {"number":1}
}'
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The response includes the ID of the published operation message, the channel and a list of object IDs that were affected by the operation:
{
"messageId": "TJPWHhMTrF:0",
"channel": "my-channel",
"objectIds": ["counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269"]
}
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Update an object by path
Path operations provide a convenient way to target objects based on their location in the object tree.
Paths are expressed relative to the structure of the object as defined by the compact view of the object tree.
For example, given the following compact view of the object tree:
The following example increments the LiveCounter
instance stored at the up
key on the votes
LiveMap
instance on the root object:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "COUNTER_INC",
"path": "votes.up",
"data": { "number": 1 }
}'
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You can use wildcards in paths to target multiple objects at once. To increment all LiveCounter
instances in the votes
LiveMap
instance:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "COUNTER_INC",
"path": "votes.*",
"data": { "number": 1 }
}'
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The response includes the IDs of each of the affected object instances:
{
"messageId": "0Q1w-LpA11:0",
"channel": "my-channel",
"objectIds": [
"counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669"
]
}
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Wildcards can be included at the end or in the middle of paths and will match exactly one level in the object tree. For example, given the following compact view of the object tree:
{
"posts": {
"post1": {
"votes": {
"up": 5,
"down": 10
}
},
"post2": {
"votes": {
"up": 5,
"down": 10
}
}
}
}
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The following example increments the upvote LiveCounter
instances for all posts in the posts
LiveMap
instance:
curl -X POST "https://sandbox-rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "COUNTER_INC",
"path": "posts.*.votes.up",
"data": { "number": 1 }
}'
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If your LiveMap
keys contain periods, you can escape them with a backslash. The following example increments the upvote LiveCounter
instance for a post with the key post.123
:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "COUNTER_INC",
"path": "posts.post\.123.votes.up",
"data": { "number": 1 }
}'
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Creating objects
Use the MAP_CREATE
and COUNTER_CREATE
operations to create new objects. You can optionally specify an initial value for the object in the data
field when creating it.
For MAP_CREATE
, the data
field should be a JSON object that contains the initial entries for the LiveMap
instance:
{
"operation": "MAP_CREATE",
"data": {
"title": {"string": "LiveObjects is awesome"},
"createdAt": {"number": 1745835181122},
"isPublished": {"boolean": true}
}
}
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For COUNTER_CREATE
, the data
field should be a JSON object that contains the initial value for the LiveCounter
instance:
{
"operation": "COUNTER_CREATE",
"data": { "number": 5 }
}
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When you create a new object it is important that the new object is assigned to the object tree so that it is reachable from the root object.
The simplest way to do this is to use the path
field in the request body. The path is relative to the root object and specifies where in the object tree the new object should be created.
The following example creates a new LiveMap
instance and assigns it to the posts
LiveMap
instance on the root object under the key post1
:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "MAP_CREATE",
"path": "posts.post1",
"data": {
"title": {"string": "LiveObjects is awesome"},
"createdAt": {"number": 1745835181122},
"isPublished": {"boolean": true}
}
}'
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When using the path
specifier with a COUNTER_CREATE
or MAP_CREATE
operation, the server constructs two operations which are published as a batch :
- A
MAP_CREATE
orCOUNTER_CREATE
operation used to create the new object - A
MAP_SET
operation used to assign the new object to theLiveMap
instance specified by thepath
Therefore the response will include the object IDs of all objects affected by the resulting set of operations:
{
"messageId": "mkfjWU2jju:0",
"channel": "my-channel",
"objectIds": [
"map:cRCKx-eev7Tl66jGfl1SkZh_uEMo6F5jyV0B7mUn4Zs@1745835549101",
"map:a_oQqPYUGxi95_Cn0pWcsoeBlHZZtVW5xKIw0hnJCZs@1745835547258"
]
}
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Removing objects
There is no explicit delete operation for objects themselves. Objects that are not reachable from the root map will be eligible for garbage collection.
Remove a reference to a nested object in a LiveMap
instance using the MAP_REMOVE
operation:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"operation": "MAP_REMOVE",
"objectId": "root",
"data": {"key": "posts"}
}'
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If no other references to the object exist, it will no longer be reachable from the root object and will be eligible for garbage collection.
Batch operations
You can group several operations into a single request by sending an array of operations.
All operations inside the array form a batch operation which is published as a single message. All operations in the batch are processed as a single atomic unit.
The following example shows how to increment two distinct LiveCounter
instances in a single batch operation:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '[
{
"operation": "COUNTER_INC",
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"data": {"number": 1}
},
{
"operation": "COUNTER_INC",
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"data": {"number": 1}
}
]'
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Idempotent operations
Publish operations idempotently in the same way as for idempotent message publishing by specifying a id
for the operation message:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '{
"id": "my-idempotency-key",
"operation": "COUNTER_INC",
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"data": {"number": 1}
}'
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For batch operations, use the format <baseId>:<index>
where the index is the zero-based index of the operation in the array:
curl -X POST "https://rest.ably.io/channels/my-channel/objects" \
-u <loading API key, please wait> \
-H "Content-Type: application/json" \
-d '[
{
"id": "my-idempotency-key:0",
"operation": "COUNTER_INC",
"objectId": "counter:iVji62_MW_j4dShuJbr2fmsP2D8MyCs6tFqON9-xAkc@1745828645269",
"data": {"number": 1}
},
{
"id": "my-idempotency-key:1",
"operation": "COUNTER_INC",
"objectId": "counter:JbZYiHnw0ORAyzzLSQahVik31iBDL_ehJNpTEF3qwg8@1745828651669",
"data": {"number": 1}
}
]'
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