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3886338c1d
As suggested by Anssi. This has the slightly strange side effect of
passing the expression to Expression.convert_value has the expression
passed back to it, but it allows more complex patterns of expressions.
Backport of 32d4db66b9 from master
135 lines
3.1 KiB
Python
135 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Serialization
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``django.core.serializers`` provides interfaces to converting Django
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``QuerySet`` objects to and from "flat" data (i.e. strings).
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"""
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from __future__ import unicode_literals
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from decimal import Decimal
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from django.db import models
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from django.utils import six
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from django.utils.encoding import python_2_unicode_compatible
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@python_2_unicode_compatible
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class Category(models.Model):
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name = models.CharField(max_length=20)
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class Meta:
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ordering = ('name',)
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def __str__(self):
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return self.name
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@python_2_unicode_compatible
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class Author(models.Model):
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name = models.CharField(max_length=20)
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class Meta:
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ordering = ('name',)
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def __str__(self):
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return self.name
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@python_2_unicode_compatible
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class Article(models.Model):
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author = models.ForeignKey(Author)
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headline = models.CharField(max_length=50)
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pub_date = models.DateTimeField()
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categories = models.ManyToManyField(Category)
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class Meta:
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ordering = ('pub_date',)
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def __str__(self):
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return self.headline
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@python_2_unicode_compatible
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class AuthorProfile(models.Model):
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author = models.OneToOneField(Author, primary_key=True)
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date_of_birth = models.DateField()
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def __str__(self):
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return "Profile of %s" % self.author
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@python_2_unicode_compatible
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class Actor(models.Model):
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name = models.CharField(max_length=20, primary_key=True)
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class Meta:
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ordering = ('name',)
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def __str__(self):
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return self.name
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@python_2_unicode_compatible
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class Movie(models.Model):
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actor = models.ForeignKey(Actor)
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title = models.CharField(max_length=50)
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price = models.DecimalField(max_digits=6, decimal_places=2, default=Decimal('0.00'))
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class Meta:
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ordering = ('title',)
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def __str__(self):
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return self.title
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class Score(models.Model):
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score = models.FloatField()
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@python_2_unicode_compatible
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class Team(object):
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def __init__(self, title):
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self.title = title
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def __str__(self):
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raise NotImplementedError("Not so simple")
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def to_string(self):
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return "%s" % self.title
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class TeamField(models.CharField):
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def __init__(self):
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super(TeamField, self).__init__(max_length=100)
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def get_db_prep_save(self, value, connection):
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return six.text_type(value.title)
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def to_python(self, value):
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if isinstance(value, Team):
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return value
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return Team(value)
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def from_db_value(self, value, expression, connection, context):
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return Team(value)
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def value_to_string(self, obj):
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return self._get_val_from_obj(obj).to_string()
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def deconstruct(self):
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name, path, args, kwargs = super(TeamField, self).deconstruct()
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del kwargs['max_length']
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return name, path, args, kwargs
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@python_2_unicode_compatible
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class Player(models.Model):
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name = models.CharField(max_length=50)
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rank = models.IntegerField()
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team = TeamField()
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def __str__(self):
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return '%s (%d) playing for %s' % (self.name, self.rank, self.team.to_string())
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