feat: allow running sub-tasks from tasks

[AlessioGr]

Task handlers now receive inlineTask as an arg, which can be used to run inline sub-tasks. In the task log, those inline tasks will have a parent property that points to the parent task.

Example:

{
        slug: 'subTask',
        inputSchema: [
          {
            name: 'message',
            type: 'text',
            required: true,
          },
        ],
        handler: async ({ job, inlineTask }) => {
          await inlineTask('create two docs', {
            task: async ({ input, inlineTask }) => {
            
              const { newSimple } = await inlineTask('create doc 1', {
                task: async ({ req }) => {
                  const newSimple = await req.payload.create({
                    collection: 'simple',
                    req,
                    data: {
                      title: input.message,
                    },
                  })
                  return {
                    output: {
                      newSimple,
                    },
                  }
                },
              })

              const { newSimple2 } = await inlineTask('create doc 2', {
                task: async ({ req }) => {
                  const newSimple2 = await req.payload.create({
                    collection: 'simple',
                    req,
                    data: {
                      title: input.message,
                    },
                  })
                  return {
                    output: {
                      newSimple2,
                    },
                  }
                },
              })
              return {
                output: {
                  simpleID1: newSimple.id,
                  simpleID2: newSimple2.id,
                },
              }
            },
            input: {
              message: job.input.message,
            },
          })
        },
      } as WorkflowConfig<'subTask'>

Job log example:

[
  {
    executedAt: '2025-01-06T03:55:44.682Z',
    completedAt: '2025-01-06T03:55:44.684Z',
    taskSlug: 'inline',
    taskID: 'create doc 1',
    output: { newSimple: [Object] },
    parent: { taskSlug: 'inline', taskID: 'create two docs' }, // <= New
    state: 'succeeded',
    id: '677b5440ba35d345d1214d1b'
  },
  {
    executedAt: '2025-01-06T03:55:44.690Z',
    completedAt: '2025-01-06T03:55:44.692Z',
    taskSlug: 'inline',
    taskID: 'create doc 2',
    output: { newSimple2: [Object] },
    parent: { taskSlug: 'inline', taskID: 'create two docs' }, // <= New
    state: 'succeeded',
    id: '677b5440ba35d345d1214d1c'
  },
  {
    executedAt: '2025-01-06T03:55:44.681Z',
    completedAt: '2025-01-06T03:55:44.697Z',
    taskSlug: 'inline',
    taskID: 'create two docs',
    input: { message: 'hello!' },
    output: {
      simpleID1: '677b54401e34772cc63c8693',
      simpleID2: '677b54401e34772cc63c8697'
    },
    parent: {},
    state: 'succeeded',
    id: '677b5440ba35d345d1214d1d'
  }
]

[DanRibbens]

Needs docs. Also, I don't understand the use case for this at all.

[DanRibbens]

Let's talk through change more. I'd be very interested in finding a more simple solution.

I'm wondering if workflows can have workflows instead of tasks having subtasks, or some other simplification to this in some way.

Let's hold off on adding docs until we can talk.

[DanRibbens]

This is going to be a breaking change which is why I'm very cautious about getting this merged.

[github-actions]

🚀 This is included in version v3.15.0