from django.db import connection
from django.db import models


class Article(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, db_index=True)