How do I acquire the taskId for a particular processInstanceId in Camunda Platform 8?

Camunda 8 Topics Discussion & Questions
1

Using TaskList(Graphql) API,

I was able to extract task information using the snippet below.

query GetTask($id: String!) {
  task(id: $id) {
    id
    variables
    taskDefinitionId
    formKey
    processDefinitionId
    assignee
    name
    taskState
    processName
    creationTime
    completionTime
    __typename
  }
}

However, using process Instance Id, I’m unable to obtain the task id.

Is it possible to get the task id from the given process instance id? using camunda platform 8.

2

Greetings, Camunda Platform 8 Team!

I’d like your opinion on the aforementioned Usecase.?

Regards, Thank you,

3

Hi Ramakrishnan,

One option might be to store a unique custom business key as a process variable. For example, you could set a variable my-business-key with value xyz.

Then, it’s possible to use the operate rest api to find variables. For example, you could find the variables for instance id 123 like this:

POST <operate-url>/api/process-instances/123/variables

(with payload of {“scopeId”:“123"})

… the result would look something like …

[
    {
        "id": "123-my-business-key",
        "name": "My Business Key",
        "value": "\"xyz\"",
        "isPreview": false,
        "hasActiveOperation": false,
        "isFirst": true,
    }
]

Now that you have the value of my-business-key, search for all tasks with something like this (via tasklist graphql api):

{
  tasks(query: {taskDefinitionId: "my_user_task"}) {
    id
    name
    taskDefinitionId
    variables {
        id
        name
        value
    }
  }
}

And then filter the results to find the task with the variable named my-business-key and value xyz

{
    "data": {
        "tasks": [
            {
                "name": "My User Task",
                "id": "2251799813685261",
                "taskDefinitionId": "my_user_task",
                "variables": [
                    {
                        "id": "123-my-business-key",
                        "name": "My Business Key",
                        "value": "\"xyz\""
                    }
                ]
            }
        ]
    }
}

I’ll reply to this thread if I find a better way, but that’s the best I can find for now. Hope that helps!

4