Fixed #708 -- Fixed searching within IP fields on PostgreSQL.

    def deferrable_sql(self):

        return " DEFERRABLE INITIALLY DEFERRED"

    def field_cast_sql(self, db_type):

        if db_type == 'inet':

            return 'CAST(%s AS TEXT)'

        return '%s'

    def last_insert_id(self, cursor, table_name, pk_name):

        cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))

        return cursor.fetchone()[0]

class Article(models.Model):

    name = models.CharField(max_length=50)

    text = models.TextField()

    submitted_from = models.IPAddressField(blank=True, null=True)

    def __str__(self):

        return "Article %s" % self.name

>>> Article.objects.get(text__contains='quick brown fox')

<Article: Article Test>

# Regression test for #708: "like" queries on IP address fields require casting

# to text (on PostgreSQL).

>>> Article(name='IP test', text='The body', submitted_from='192.0.2.100').save()

>>> Article.objects.filter(submitted_from__contains='192.0.2')

[<Article: Article IP test>]

"""}