Question

我试图将User实例传递给其他函数，但无法实现。 User实例不可JSON可序列化，因此我在Google上进行了一些搜索，发现可以在Django中使用内置的序列化程序。但是我仍然无法使其正常工作。

观看次数1：

from django.core import serializers
userdata = request.user
serialized_obj = serializers.serialize('json', userdata)
SubtaskUpdate("2464c7ca-7f14-11e9-b4c2-b870aca6d744", serialized_obj)

观看次数2：

def SubtaskUpdate(taskid, user):
    base_dir = settings.BASE_DIR
    uniquefolder = os.path.join(base_dir, 'var/taskqueries').replace("\\", "/")
    os.chdir(uniquefolder)
    logfilnavn = str(uuid.uuid4()) # Variabel til filnavn
    logfile = open(logfilnavn, 'w') # Åbner fil med navn fra forrige variabel
    proc=subprocess.Popen(['golemcli', '--mainnet', "tasks", 'subtasks', taskid, "--json"], universal_newlines=True, stdout=logfile, stderr=logfile)
    proc.wait()
    logfile.close()
    taskre = Task(TaskID=taskid, User=user)
    taskre.save()
    with open(logfilnavn) as json_file:
        print(json_file) 
        json_object = json.load(json_file)
        for node in json_object['values']:
            Node = node[0]
            ID = node[1]
            Time = node[2]
            Status = node[3]
            h = NodesData.objects.get(Node=Node)
            a = Subtask(SubtaskID=ID, Country=h.NodeCountry, City=h.NodeCity, Cores=h.Node_Cores, Disk=h.Node_Disk, Memory=h.Node_Memory, OS=h.Node_OS,  SubtaskNode=Node, SubtaskStatus=Status, Task=taskre)
            a.save()
    os.remove(logfilnavn)

型号：

class Task(models.Model):
    TaskID = models.CharField(max_length=128)
    User = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,)



class Subtask(models.Model):
    SubtaskID = models.CharField(max_length=128, default="Awaiting Query")
    SubtaskNode = models.CharField(max_length=24, default="Awaiting Query")
    SubtaskStatus = models.CharField(max_length=15, default="Awaiting Query")
    Country = models.CharField(max_length=25, default="Awaiting Query")
    City = models.CharField(max_length=25, default="Awaiting Query")
    OS = models.CharField(max_length=15, default="Awaiting Query")
    Cores = models.CharField(max_length=15, default="Awaiting Query")
    Memory = models.CharField(max_length=15, default="Awaiting Query")
    Disk = models.CharField(max_length=15, default="Awaiting Query")
    SubtaskStatus = models.CharField(max_length=15, default="Awaiting Query")
    Task = models.ForeignKey(Task, on_delete=models.CASCADE)

跟踪：

> Internal Server Error: /faq Traceback (most recent call last):   File
> "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/handlers/exception.py",
> line 34, in inner
>     response = get_response(request)   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/handlers/base.py",
> line 126, in _get_response
>     response = self.process_exception_by_middleware(e, request)   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/handlers/base.py",
> line 124, in _get_response
>     response = wrapped_callback(request, *callback_args, **callback_kwargs)   File "./faq/views.py", line 11, in index
>     serialized_obj = serializers.serialize('json', userdata)   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/serializers/__init__.py",
> line 128, in serialize
>     s.serialize(queryset, **options)   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/serializers/base.py",
> line 87, in serialize
>     for count, obj in enumerate(queryset, start=1):   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/utils/functional.py",
> line 214, in inner
>     return func(self._wrapped, *args) TypeError: 'User' object is not iterable Not Found: /favicon.ico

修改代码追溯：

from django.shortcuts import render
from .models import stats
from backgroundtasks.models import NodesData
from backgroundtasks.tasks import SubtaskUpdate
from callgolem.models import Task, Subtask
from django.core import serializers
import json


def index(request):
    SubtaskUpdate("2464c7ca-7f14-11e9-b4c2-b870aca6d744", request.user)
    data = stats.objects.get(id=1)
    mapdb = NodesData.objects.all()
    return render(request, 'faq.html', {'data':data, 'mapdb':mapdb}) 

Traceback (most recent call last):
   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
   File "./faq/views.py", line 10, in index
    SubtaskUpdate("2464c7ca-7f14-11e9-b4c2-b870aca6d744", request.user)
   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/background_task/tasks.py", line 296, in __call__
    remove_existing_tasks)
   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/background_task/tasks.py", line 223, in schedule
    repeat_until, remove_existing_tasks)
   File "/home/django/copypaste/cleanup/lib/python3.6/site-packages/background_task/models.py", line 91, in new_task
    task_params = json.dumps((args, kwargs), sort_keys=True)
   File "/usr/lib/python3.6/json/__init__.py", line 238, in dumps
    **kw).encode(obj)
   File "/usr/lib/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
   File "/usr/lib/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
   File "/usr/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__) TypeError: Object of type 'User' is not JSON serializable
Not Found: /favicon.ico

Answer 1

将参数传递给后台任务时，应避免传递模型实例。而是传递ID并在任务本身中获取实例。

SubtaskUpdate('<uuid>',  request.user.id)

...

def SubtaskUpdate(taskid, user_id):
    user = User.objects.get(id=user_id)

序列化用户实例以用于其他功能

1 个答案: