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from django.db import 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().__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()
published = models.BooleanField(default=False)
# Add virtual relation to the ArticleTranslation model.
translation = CurrentTranslation(
ArticleTranslation, models.CASCADE, ["id"], ["article"]
)
class Meta:
indexes = [models.Index(fields=["headline", "pub_date"])]
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)
class Meta:
required_db_features = {"supports_index_on_text_field"}
class IndexedArticle2(models.Model):
headline = models.CharField(max_length=100)
body = models.TextField()
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