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