GAE 使用 Python 将数组发布到数据存储区（一对多）

Question

已经与 GAE 合作了几个月。这是我第一次在这里处理一对多关系。在我开始处理关系之前，一切都很好地发布到了数据存储中。这是第一个。有人可以帮我把这个“帖子”发到数据存储区吗？文档和其他示例现在非常混乱。我知道我做错了employees=r['Employees'], 我只想先发一个简单的帖子。如果你能把它弄得更好！如图所示，我在发布时收到 BadValueError；

model.py

class Project(ndb.Model):
    projectID = ndb.IntegerProperty(required=True)
    title = ndb.StringProperty(required=True)
    description = ndb.StringProperty(required=True)
    startAt = ndb.DateTimeProperty(indexed=True)
    endAt = ndb.DateTimeProperty()
    employees = ndb.KeyProperty(kind='Employees', repeated=True)

class Employees(ndb.Model):
    name = ndb.StringProperty()
    role = ndb.StringProperty()

handlers.py

 def post(self):
    r = json.loads(self.request.body) 
    print str(r)

    g = Project(projectID=int(r['ProjectID']),  
                description=r['Description'],
                title=r['Title'],
                employees=r['Employees'],
                startAt=datetime.strptime(r['StartAt'], '%d/%m/%Y %H:%M %p'),
                endAt=datetime.strptime(r['EndAt'], '%d/%m/%Y %H:%M %p'))

    project_key = g.put()
    project_key.get()
    print project_key

controller.js

    $scope.employees = [
                            {
                                name:'mark',
                                role: 'dev'
                            }, 
                            {
                                name:'colin',
                                role: 'dev2'
                            }, 
                       ];

更新------------------------------- ---------------------------------------

json 处理程序

class commentsJsonHandler(webapp2.RequestHandler):
@classmethod
def route(cls):
    """
    name: index, template: /
    """
    return webapp2.Route('/comments', handler=cls, name='_commments_')


def get(self):  
    recommendations = Project.query()

    def date_handler(obj):
        if isinstance(obj, datetime):
            return obj.isoformat()
        else:
            raise TypeError

    self.response.out.write(json.dumps([dict(rec.to_dict(), **dict(id=rec.key.id())) for rec in recommendations], default=date_handler))

Answer 1

您必须在您的 json 有效负载中遍历员工集合并首先创建这些员工实体并使用它们的键来创建项目实体

def post(self):
    r = json.loads(self.request.body)
    print str(r)
    employee_keys = []
    for emp in r['Employees']:
        employee = Employees(name=emp['name'], role=emp['role'])
        employee.put()
        employee_keys.append(employee.key)


    g = Project(projectID=int(r['ProjectID']),
                description=r['Description'],
                title=r['Title'],
                employees=employee_keys,
                startAt=datetime.strptime(r['StartAt'], '%d/%m/%Y %H:%M %p'),
                endAt=datetime.strptime(r['EndAt'], '%d/%m/%Y %H:%M %p'))

    project_key = g.put()
    project_key.get()
    print project_key