CODEWITHSUNDEEP
pythondjango
Abhishek
Abhishek

Reputation: 3068

django serialization on natural key error

I have a django model where i use natural keys:

class AcademicProgramsManager(models.Manager):
    def get_by_natural_key(self, acad_program_id, program_title, required_credits):
        return self.get(acad_program_id = acad_program_id, program_title = program_title, required_credits = required_credits)

class AcademicPrograms(models.Model):

    objects = AcademicProgramsManager()
    acad_program_id = models.IntegerField(primary_key=True)
    acad_program_category = models.ForeignKey(AcademicProgramCategories)
    acad_program_type = models.ForeignKey(AcademicProgramTypes)
    acad_program_code = models.CharField(max_length=25)
    program_title = models.CharField(max_length=64)
    required_credits = models.IntegerField()
    min_gpa = models.FloatField()
    description = models.CharField(max_length=1000)

    def natural_key(self):
    return (self.acad_program_id, self.program_title, self.required_credits)

class StudentAcademicPrograms(models.Model):
    student = models.ForeignKey(Students)
    academic_program = models.ForeignKey(AcademicPrograms)
    credits_completed = models.IntegerField()
    academic_program_gpa = models.FloatField()
    primary_program = models.BooleanField()

    def __str__(self):
    return self.credits_completed

When i am trying to serialize the StudentAcademicPrograms with the following command, it is throwing an error.

>>> with open("datafile.json","w") as out:...     
        serialize("json", StudentAcademicPrograms.objects.all(), indent=2, use_natural_foreign_keys=True, use_natural_primary_keys=True)
    ... 
    Traceback (most recent call last):
      File "<console>", line 2, in <module>
      File "/home/abhishek/projects/texascompletes/local/lib/python2.7/site-packages/django/core/serializers/__init__.py", line 122, in serialize
        s.serialize(queryset, **options)
      File "/home/abhishek/projects/texascompletes/local/lib/python2.7/site-packages/django/core/serializers/base.py", line 58, in serialize
        self.end_object(obj)
      File "/home/abhishek/projects/texascompletes/local/lib/python2.7/site-packages/django/core/serializers/json.py", line 52, in end_object
        cls=DjangoJSONEncoder, **self.json_kwargs)
      File "/usr/lib/python2.7/json/__init__.py", line 186, in dump
        default=default, sort_keys=sort_keys, **kw).iterencode(obj)
    TypeError: __init__() got an unexpected keyword argument 'use_natural_foreign_keys'

Where am i going wrong?

Upvotes: 0

Views: 853

Answers (1)

alecxe
alecxe

Reputation: 473833

According to the documentation, use_natural_keys was "splitted" to use_natural_foreign_keys and use_natural_primary_keys in Django 1.7 version which is not a stable version currently.

You can either upgrade to django development version or use use_natural_keys keyword.

Upvotes: 2

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