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c2ba59fc1d
* Removed `Manipulator`, `AutomaticManipulator`, and related classes.
* Removed oldforms specific bits from model fields:
* Removed `validator_list` and `core` arguments from constructors.
* Removed the methods:
* `get_manipulator_field_names`
* `get_manipulator_field_objs`
* `get_manipulator_fields`
* `get_manipulator_new_data`
* `prepare_field_objs_and_params`
* `get_follow`
* Renamed `flatten_data` method to `value_to_string` for better alignment with its use by the serialization framework, which was the only remaining code using `flatten_data`.
* Removed oldforms methods from `django.db.models.Options` class: `get_followed_related_objects`, `get_data_holders`, `get_follow`, and `has_field_type`.
* Removed oldforms-admin specific options from `django.db.models.fields.related` classes: `num_in_admin`, `min_num_in_admin`, `max_num_in_admin`, `num_extra_on_change`, and `edit_inline`.
* Serialization framework
* `Serializer.get_string_value` now calls the model fields' renamed `value_to_string` methods.
* Removed a special-casing of `models.DateTimeField` in `core.serializers.base.Serializer.get_string_value` that's handled by `django.db.models.fields.DateTimeField.value_to_string`.
* Removed `django.core.validators`:
* Moved `ValidationError` exception to `django.core.exceptions`.
* For the couple places that were using validators, brought over the necessary code to maintain the same functionality.
* Introduced a SlugField form field for validation and to compliment the SlugField model field (refs #8040).
* Removed an oldforms-style model creation hack (refs #2160).
git-svn-id: http://code.djangoproject.com/svn/django/trunk@8616 bcc190cf-cafb-0310-a4f2-bffc1f526a37
115 lines
3.2 KiB
Python
115 lines
3.2 KiB
Python
"""
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Tests for field subclassing.
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"""
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from django.db import models
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from django.utils.encoding import force_unicode
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from django.core import serializers
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from django.core.exceptions import FieldError
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class Small(object):
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"""
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A simple class to show that non-trivial Python objects can be used as
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attributes.
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"""
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def __init__(self, first, second):
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self.first, self.second = first, second
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def __unicode__(self):
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return u'%s%s' % (force_unicode(self.first), force_unicode(self.second))
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def __str__(self):
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return unicode(self).encode('utf-8')
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class SmallField(models.Field):
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"""
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Turns the "Small" class into a Django field. Because of the similarities
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with normal character fields and the fact that Small.__unicode__ does
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something sensible, we don't need to implement a lot here.
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"""
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__metaclass__ = models.SubfieldBase
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def __init__(self, *args, **kwargs):
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kwargs['max_length'] = 2
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super(SmallField, self).__init__(*args, **kwargs)
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def get_internal_type(self):
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return 'CharField'
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def to_python(self, value):
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if isinstance(value, Small):
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return value
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return Small(value[0], value[1])
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def get_db_prep_save(self, value):
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return unicode(value)
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def get_db_prep_lookup(self, lookup_type, value):
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if lookup_type == 'exact':
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return force_unicode(value)
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if lookup_type == 'in':
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return [force_unicode(v) for v in value]
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if lookup_type == 'isnull':
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return []
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raise FieldError('Invalid lookup type: %r' % lookup_type)
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class MyModel(models.Model):
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name = models.CharField(max_length=10)
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data = SmallField('small field')
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def __unicode__(self):
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return force_unicode(self.name)
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__test__ = {'API_TESTS': ur"""
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# Creating a model with custom fields is done as per normal.
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>>> s = Small(1, 2)
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>>> print s
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12
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>>> m = MyModel(name='m', data=s)
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>>> m.save()
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# Custom fields still have normal field's attributes.
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>>> m._meta.get_field('data').verbose_name
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'small field'
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# The m.data attribute has been initialised correctly. It's a Small object.
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>>> m.data.first, m.data.second
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(1, 2)
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# The data loads back from the database correctly and 'data' has the right type.
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>>> m1 = MyModel.objects.get(pk=m.pk)
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>>> isinstance(m1.data, Small)
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True
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>>> print m1.data
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12
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# We can do normal filtering on the custom field (and will get an error when we
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# use a lookup type that does not make sense).
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>>> s1 = Small(1, 3)
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>>> s2 = Small('a', 'b')
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>>> MyModel.objects.filter(data__in=[s, s1, s2])
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[<MyModel: m>]
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>>> MyModel.objects.filter(data__lt=s)
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Traceback (most recent call last):
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...
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FieldError: Invalid lookup type: 'lt'
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# Serialization works, too.
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>>> stream = serializers.serialize("json", MyModel.objects.all())
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>>> stream
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'[{"pk": 1, "model": "field_subclassing.mymodel", "fields": {"data": "12", "name": "m"}}]'
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>>> obj = list(serializers.deserialize("json", stream))[0]
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>>> obj.object == m
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True
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# Test retrieving custom field data
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>>> m.delete()
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>>> m1 = MyModel(name="1", data=Small(1, 2))
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>>> m1.save()
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>>> m2 = MyModel(name="2", data=Small(2, 3))
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>>> m2.save()
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>>> for m in MyModel.objects.all(): print unicode(m.data)
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12
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23
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"""}
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