Question

鉴于这些模型：

class ModelA(models.Model):
    # Some fields
    # Some relationship

class ModelB(models.Model):
    # Some fields
    a = models.ForeignKey(ModelA)

和这些tastypie资源：

class ResourceA(ModelResource):
    b_list = fields.ToManyField('app.api.ResourceB', 'a_set', null=True, related_name='a')

class ResourceB(ModelResource):
    a = fields.ToOneField(ResourceA, 'a', null=True)

如果我访问ResourceB的详细端点（/ api / v1 / resourceA / ## /），我可以看到所有相关的B的uris - 反向关系有效。返回的数据如下所示：

{
    'b_list': [
        '/api/v1/resourceB/1/',
        '/api/v1/resourceB/2/',
    ]
}

如果我尝试对资源A进行PUT或PATCH以向其添加新的B，请使用此数据：

{
    'b_list': [
        '/api/v1/resourceB/1/',
        '/api/v1/resourceB/2/',
        '/api/v1/resourceB/3/',
    ]
}

我收到错误：'ManyRelatedManager' object has no attribute 'add'此堆栈跟踪：

Traceback (most recent call last):

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 202, in wrapper
    response = callback(request, *args, **kwargs)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 449, in dispatch_detail
    return self.dispatch('detail', request, **kwargs)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 472, in dispatch
    response = method(request, **kwargs)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 1611, in patch_detail
    self.update_in_place(request, bundle, deserialized)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 1634, in update_in_place
    return self.obj_update(bundle=original_bundle, **kwargs)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2166, in obj_update
    return self.save(bundle, skip_errors=skip_errors)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2257, in save
    self.save_m2m(m2m_bundle)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2382, in save_m2m
    related_resource.save(updated_related_bundle)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2257, in save
    self.save_m2m(m2m_bundle)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2382, in save_m2m
    related_resource.save(updated_related_bundle)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2257, in save
    self.save_m2m(m2m_bundle)

  File \"/home/username/.virtualenvs/myapp/local/lib/python2.7/site-packages/tastypie/resources.py\", line 2385, in save_m2m
    related_mngr.add(*related_objs)

AttributeError: 'ManyRelatedManager' object has no attribute 'add'

如果我立即 PUT / PATCH相同的数据，我没有错误，没有堆栈跟踪，并且项目已成功添加到关系中。我无法弄清楚为什么会这样。

另外，我似乎只能在关系中添加项目 - 能够删除它们也很棒。我可能会问另一个问题。

Answer 1

确定。这是一个Django错误。我不确定，尝试在django模型中使用related_name。

class ModelB(models.Model):
# Some fields
a = models.ForeignKey(ModelA, related_name='b_list')

从资源中删除related_name，属性名称必须从“a_set”更改为“b_list”

class ResourceA(ModelResource):
b_list = fields.ToManyField('app.api.ResourceB', 'b_list', null=True)

在django-tastypie中将项添加到one_to_many关系仅适用于第二次

1 个答案: