mirror of https://github.com/django/django.git
54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
from django.db import connection, models
|
|
|
|
|
|
class CurrentTranslation(models.ForeignObject):
|
|
"""
|
|
Creates virtual relation to the translation with model cache enabled.
|
|
"""
|
|
# Avoid validation
|
|
requires_unique_target = False
|
|
|
|
def __init__(self, to, on_delete, from_fields, to_fields, **kwargs):
|
|
# Disable reverse relation
|
|
kwargs['related_name'] = '+'
|
|
# Set unique to enable model cache.
|
|
kwargs['unique'] = True
|
|
super(CurrentTranslation, self).__init__(to, on_delete, from_fields, to_fields, **kwargs)
|
|
|
|
|
|
class ArticleTranslation(models.Model):
|
|
|
|
article = models.ForeignKey('indexes.Article', models.CASCADE)
|
|
article_no_constraint = models.ForeignKey('indexes.Article', models.CASCADE, db_constraint=False, related_name='+')
|
|
language = models.CharField(max_length=10, unique=True)
|
|
content = models.TextField()
|
|
|
|
|
|
class Article(models.Model):
|
|
headline = models.CharField(max_length=100)
|
|
pub_date = models.DateTimeField()
|
|
|
|
# Add virtual relation to the ArticleTranslation model.
|
|
translation = CurrentTranslation(ArticleTranslation, models.CASCADE, ['id'], ['article'])
|
|
|
|
class Meta:
|
|
index_together = [
|
|
["headline", "pub_date"],
|
|
]
|
|
|
|
|
|
# Model for index_together being used only with single list
|
|
class IndexTogetherSingleList(models.Model):
|
|
headline = models.CharField(max_length=100)
|
|
pub_date = models.DateTimeField()
|
|
|
|
class Meta:
|
|
index_together = ["headline", "pub_date"]
|
|
|
|
# Indexing a TextField on Oracle or MySQL results in index creation error.
|
|
if connection.vendor == 'postgresql':
|
|
class IndexedArticle(models.Model):
|
|
headline = models.CharField(max_length=100, db_index=True)
|
|
body = models.TextField(db_index=True)
|
|
slug = models.CharField(max_length=40, unique=True)
|