Django-Tastypie self children - django

Question

Trying to make api for multiple subtasks.
I have the task model, that can have another task as a parent:
class Task(models.Model):
parent_task = models.ForeignKey("Task", null=True, blank=True)
name = models.CharField(max_length=64)
def __unicode__ (self):
return self.name
Now I'm trying to make tastypie resource:
class TaskResource(ModelResource):
parent_task = fields.ForeignKey(TaskResource, 'parent_task', full=False) <-- ERROR HERE
class Meta:
queryset = Task.objects.all()
resource_name = 'task'
list_allowed_methods = ['get', 'put', 'post', 'delete']
include_resource_uri = False
def dehydrate(self, bundle, for_list=False):
bundle.data["subtasks"] = "how?" <-- HOW??
return bundle
Thanks for your time.
P.S. I need something like this:
[
{
"id": 1,
"name": "Task 1",
"subtasks": [
{
"id": 1,
"name": "Task 1",
"subtasks": [...]
}
]
},
{
"id": 2,
"name": "Task 2",
"subtasks": "how?"
}
]

Answer 1

Almost a copy of Including child resources in a Django Tastypie API but not exactly.
So your first problem is that you specify relation to self wrong. It should be just self:
parent_task = fields.ForeignKey('self', 'parent_task', null=True, full=False)
Secondly, notice null=True - parent could be null.
Lastly, you just need to add another relation field and ask for the full details
subtasks = fields.ToManyField('self', 'task_set', full=True)
task_set is a related_name for the Task.parent_task field.
The resulting code is:
class TaskResource(ModelResource):
parent_task = fields.ForeignKey('self', 'parent_task', null=True, full=False)
subtasks = fields.ToManyField('self', 'subtasks', full=True)
class Meta:
queryset = Task.objects.all()
resource_name = 'task'
list_allowed_methods = ['get', 'put', 'post', 'delete']
include_resource_uri = False
And the result:
{
"meta": {
"previous": null,
"total_count": 3,
"offset": 0,
"limit": 20,
"next": null
},
"objects": [
{
"parent_task": null,
"subtasks": [
{
"parent_task": "/api/v1/task/1/",
"subtasks": [],
"id": 2,
"name": "Root's Child 1"
},
{
"parent_task": "/api/v1/task/1/",
"subtasks": [],
"id": 3,
"name": "Root's Child 2"
}
],
"id": 1,
"name": "Root Task"
},
{
"parent_task": "/api/v1/task/1/",
"subtasks": [],
"id": 2,
"name": "Root's Child 1"
},
{
"parent_task": "/api/v1/task/1/",
"subtasks": [],
"id": 3,
"name": "Root's Child 2"
}
]
}