Unable to get ToMany to work in Tastypie

问题

I'm following the Tastypie docs, and have found myself utterly stuck. I have the following:

API:

class ProjectResource(ModelResource):
    milestones = fields.ToManyField('ProjectTrackerServer.projects.api.MilestoneResource', 'projects', related_name='project', full=True)

    class Meta:
        queryset = Project.objects.all()
        resource_name = 'project'


class MilestoneResource(ModelResource):
    project = fields.ToOneField('ProjectTrackerServer.projects.api.ProjectResource', 'project')

    class Meta:
        queryset = Milestone.objects.all()
        resource_name = 'milestone'

[UPDATE: The above API worked - based one the models below ]

Here are my models.

MODEL - Milestone:

from django.db import models
from ProjectTrackerServer.projects.models import Project
class Milestone(models.Model):
    project = models.ForeignKey(Project, related_name='projects')
    name = models.TextField()
    start_date = models.DateField()
    due_date = models.DateField()
    completed_date = models.DateField()
    description = models.TextField()
    status = models.IntegerField()

def __unicode__(self):
    return self.name

MODEL - Project:

from django.db import models
from django.template.defaultfilters import slugify

class Project(models.Model):
     name = models.CharField(max_length=200)
     start_date = models.DateField()
     end_date = models.DateField()
     pm_id = models.IntegerField()
     status = models.IntegerField()
     slug = models.SlugField()

     def __unicode__(self):
         return self.name

     def save(self, *args, **kwargs):
         if not self.slug:
             self.slug = slugify(self.name)[:50]
             return super(Project, self).save(*args, **kwargs)

I still get the same error:

{"error_message": "'Project' object has no attribute 'milestones'", "traceback": "Traceback (most recent call last):\n\n File \"C:\Python27\lib\site-packages\tastypie\resources.py\", line 192, in wrapper\n response = callback(request, *args, **kwargs)\n\n File \"C:\Python27\lib\site-packages\tastypie\resources.py\", line 406, in dispatch_detail\n return self.dispatch('detail', request, **kwargs)\n\n File \"C:\Python27\lib\site-packages\tastypie\resources.py\", line 427, in dispatch\n response = method(request, **kwargs)\n\n File \"C:\Python27\lib\site-packages\tastypie\resources.py\", line 1058, in get_detail\n bundle = self.full_dehydrate(bundle)\n\n File \"C:\Python27\lib\site-packages\tastypie\resources.py\", line 654, in full_dehydrate\n bundle.data[field_name] = field_object.dehydrate(bundle)\n\n File \"C:\Python27\lib\site-packages\tastypie\fields.py\", line 690, in dehydrate\n the_m2ms = getattr(bundle.obj, self.attribute)\n\nAttributeError: 'Project' object has no attribute 'milestones'\n"}

回答1:

From the posted code I figure out that your Milestone model should look like this:

class Milestone(models.Model):
    project = ForeignKey(Project, related_name='milestones')

UPDATED:

Your working resource should look like this:

class ProjectResource(ModelResource):
  milestones = fields.ToManyField('ProjectTrackerServer.projects.api.MilestoneResource', 'projects', full=True)
class Meta:
    queryset = Project.objects.all()
    resource_name = 'project'


class MilestoneResource(ModelResource):
    project = fields.ForeignKey(Project, 'project')

    class Meta:
        queryset = Milestone.objects.all()
        resource_name = 'milestone'

回答2:

::Additional resources::

This blog has an excellent django-tastypie reverse relationship example

When I had the error AttributeError: 'Options' object has no attribute 'api_name'\n"}

I had the example line typed out as

 milestones = fields.ToManyField('ProjectTrackerServer.projects.api.Milestone', 'projects', full=True)

Make sure you are listing the "..api.MilestoneResource

~Also~

If you're getting an empty list where the relationships are, make sure that the second argument you pass into the ".ToManyField" matches your related name specified in your models file.

milestones = fields.ToManyField('ProjectTrackerServer.projects.api.MilestoneResource', 'projects', full=True)

class Milestone(models.Model):
    project = models.ForeignKey(Project, related_name='projects')
    ...

来源：https://stackoverflow.com/questions/14822280/unable-to-get-tomany-to-work-in-tastypie

标签

python

django

tastypie