Build Django models from YAML configuration files.
Take the following example:
models.py
from django.db import models
class Question(models.Model):
text = models.CharField(max_length=200)
published_on = models.DateTimeField('date published')
def __str__(self):
return self.text
class Choice(models.Model):
text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
question = models.ForeignKey(Question, on_delete=models.CASCADE)
def __str__(self):
return self.textWith yodl, you can define the model properties in a separate YAML file
and decorate the class with it.
Question.yaml
text:
type: CharField
max_length: 200
unique: True
published_on:
type: DateTimeField
args:
- date publishedChoice.yaml
text:
type: CharField
max_length: 200
votes:
type: IntegerField
default: 0
question:
type: ForeignKey
args:
- Question
on_delete: $models.CASCADEmodels.py
from django.db import models
@yodl
class Question(models.Model):
def __str__(self):
return self.text
@yodl
class Choice(models.Model):
def __str__(self):
return self.textUsage is as you would expect:
$ python manage.py shell
>>> from mysite.models import Question, Choice
>>> Question.text
<django.db.models.query_utils.DeferredAttribute object at 0x105a0bda0>
>>> Question.published_on
<django.db.models.query_utils.DeferredAttribute object at 0x105a0bd30>
>>> Choice.question
<django.db.models.fields.related_descriptors.ForwardManyToOneDescriptor object at 0x1059edc50>
>>> from django.utils import timezone
>>> question = Question.objects.create(text="""
... According to the Standard Model of elementary particles,
... which of the following is not a composite object?
... """.strip().replace('\n', ' '),
... published_on=timezone.now())
>>> _ = [Choice.objects.create(text=t, question=question) for t in [
...'Muon', 'Pi-meson', 'Neutron', 'Deuteron', 'Alpha particle'
...]
>>> _ = [print(choice) for choice in question.choice_set.all()]
Choice: Muon
Choice: Pi-meson
Choice: Neutron
Choice: Deuteron
Choice: Alpha particle