django - Django Tastypie 创建具有外键的新资源？

Question

我正在尝试使用 Tastypie 创建新实例，但我不断收到外键错误。这是我的东西：

楷模：

class SuggestionVote(models.Model):
    created_by_user = models.ForeignKey(User)
    date_created = models.DateTimeField(auto_now_add = True)
    suggestion = models.ForeignKey(Suggestion)

class Suggestion(models.Model):
    title = models.TextField(blank=True,null=True)
    created_by_user = models.ForeignKey(User)
    date_created = models.DateTimeField(auto_now_add = True)
    votes = models.IntegerField(default=0)    

    def __unicode__(self):
        return self.title

模型资源（我使用自己的认证方式）：

class UserResource(ModelResource):
    class Meta:
        list_allowed_methods = ['get']
        queryset = User.objects.all()
        resource_name = 'user'
        authentication = MyBasicAuthentication()
        authorization = DjangoAuthorization()
class SuggestionResource(ModelResource):
    class Meta:
        list_allowed_methods = ['get']
        queryset = Suggestion.objects.all()
        resource_name = 'suggestion'
        authentication = MyBasicAuthentication()
        authorization = DjangoAuthorization()

class SuggestionVoteResource(ModelResource):
    class Meta:
        list_allowed_methods = ['get', 'post']
        detail_allowed_methods = ['get', 'post', 'put', 'delete']
        queryset = SuggestionVote.objects.all()
        resource_name = 'suggestionvote'
        authentication = MyBasicAuthentication()
        authorization = DjangoAuthorization()

我使用 jQuery 的 API 调用：

var data = JSON.stringify({
    "suggestion": "/api/suggestion/1/",
    "created_by_user": "/api/user/1/"
});

$.ajax({
  url: 'http://127.0.0.1:8000/api/suggestionvote/',
  type: 'POST',
  contentType: 'application/json',
  data: data,
  dataType: 'json',
  processData: false
});

我得到的错误是：

(1048, \"列'created_by_user_id'不能为空\")

我在这里错过了什么吗？

Answer 1

我认为您需要的是关系字段的定义，这样的事情应该可以工作：

from tastypie import fields

class SuggestionResource(ModelResource):
    # the relationship 
    created_by_user = fields.ToOneField( UserResource, 'created_by_user', full = True )

    class Meta:
        list_allowed_methods = ['get']
        queryset = Suggestion.objects.all()
        resource_name = 'suggestion'
        authentication = MyBasicAuthentication()
        authorization = DjangoAuthorization()

我已经检查过了，没有类似的字段定义，我得到了一个和你一样的错误。

Answer 2

这也有效。如本Tastypie 教程中所述

from tastypie import fields

class SuggestionResource(ModelResource):
    # the relationship 
    created_by_user = fields.ForeignKey( UserResource, 'created_by_user')

    class Meta:
        list_allowed_methods = ['get']
        queryset = Suggestion.objects.all()
        resource_name = 'suggestion'
        authentication = MyBasicAuthentication()
        authorization = DjangoAuthorization()