在 Django Tastypie API 中包含子资源

我正在规划一个使用 Django 和 Tastypie 实现 REST API 的网站，并且 我很难找到“正确”的包含方式 返回的资源中的子资源。

作为沙箱，我制作了一个带有 Ticket 模型和 TicketComment 的小应用程序 模型，其中评论属于票证。我看了《Tastypie 食谱》 嵌套资源的配方（http://django-tastypie.readthedocs.org/en/latest/cookbook.html#nested-resources）， 但我很难理解为什么我应该这样做。下面的代码 使用 django.forms.models.model_to_dict() 将评论放入票证中， 但我想这里一定有什么“陷阱”。

我有什么理由不应该做我现在正在做的事情吗？还有，有没有一个 比食谱中列出的更干净的感觉模式？

型号如下：

# tickets/models.py

from django.db import models

class Ticket(models.Model):
    title = models.CharField(max_length=200)
    create_ts = models.DateTimeField(auto_now_add=True)
    submitter_email = models.EmailField()
    PRIORITY_CHOICES = (
        ('H', 'High'),
        ('M', 'Medium'),
        ('L', 'Low'),)
    priority = models.CharField(max_length=1, choices=PRIORITY_CHOICES)
    description = models.TextField()
    STATUS_CHOICES = (
        ('NEW', 'New & Unclaimed'),
        ('WIP', 'Work In Progress'),
        ('RES', 'Resolved'),
        ('CLS', 'Closed'),)
    status = models.CharField(max_length=3, choices=STATUS_CHOICES)

    def __unicode__(self):
        return "<Ticket:%d:%s>" % (self.id, self.title,)

class TicketComment(models.Model):
    ticket = models.ForeignKey(Ticket)
    comment_ts = models.DateTimeField(auto_now_add=True)
    commenter_email = models.EmailField()
    comment = models.TextField()

    def __unicode__(self):
        return "<TicketComment:%d:%d>" % (self.ticket.id, self.id,)

资源如下：

# tickets/api.py

from tastypie import fields
from tastypie.resources import ModelResource
from tickets.models import Ticket, TicketComment
from django.forms.models import model_to_dict

class TicketResource(ModelResource):

    class Meta:
        queryset = Ticket.objects.all()
        resource_name = 'ticket'

    def dehydrate(self, bundle):
        comments = TicketComment.objects.filter(ticket=bundle.data['id'])
        bundle.data['comments'] = [model_to_dict(c) for c in comments]
        return bundle

class TicketCommentResource(ModelResource):
    ticket = fields.ForeignKey(TicketResource, 'ticket')

    class Meta:
        queryset = TicketComment.objects.all()
        resource_name = 'comment'

输出如下：

{
   comments: [
        {
            comment: "This is the first comment.",
            commenter_email: "[email protected]",
            id: 1,
            ticket: 1
        },
        {
            comment: "This is the second comment.",
            commenter_email: "[email protected]",
            id: 2,
            ticket: 1
        }
    ],
    create_ts: "2011-10-17T15:55:11.372000",
    description: "This is the first ticket.",
    id: "1",
    priority: "M",
    resource_uri: "/api/v1/ticket/1/",
    status: "NEW",
    submitter_email: "[email protected]",
    title: "First Ticket"
}

您正在寻找相关领域：http://django-tastypie.readthedocs.org/en/latest/fields.html#relationship-fields