I got a raw SQL statement in my views.py
Message.objects.raw('''
SELECT s1.ID, s1.CHARACTER_ID, MAX(s1.MESSAGE) MESSAGE, MAX(s1.c) occurrences
FROM
(SELECT ID, CHARACTER_ID, MESSAGE, COUNT(*) c
FROM tbl_message WHERE ts > DATE_SUB(NOW(), INTERVAL %s DAY) GROUP BY CHARACTER_ID,MESSAGE) s1
LEFT JOIN
(SELECT ID, CHARACTER_ID, MESSAGE, COUNT(*) c
FROM tbl_message WHERE ts > DATE_SUB(NOW(), INTERVAL %s DAY) GROUP BY CHARACTER_ID,MESSAGE) s2
ON s1.CHARACTER_ID=s2.CHARACTER_ID
AND s1.c < s2.c
WHERE s2.c IS NULL
GROUP BY CHARACTER_ID
ORDER BY occurrences DESC''', [days, days])
The result of this SQL statement (tested on database directly) is:
ID | CHARACTER_ID | MESSAGE | OCCURENCES
----+--------------+---------+--------------
148 | 10 | test | 133
But all I got is a InvalidQuery
Exception with the information Raw query must include the primary key
Then I double checked the docs and read:
There is only one field that you can’t leave out - the primary key field....An InvalidQuery exception will be raised if you forget to include the primary key.
As you can see I got the requested primary key added in my statement. What's wrong?
class Message(models.Model):
character = models.ForeignKey('Character')
message = models.TextField()
location = models.ForeignKey('Location')
ts = models.DateTimeField()
class Meta:
pass
def __unicode__(self):
return u'%s: %s...' % (self.character, self.message[0:20])
An InvalidQuery exception will be raised if you forget to include the primary key.
The raw() manager method can be used to perform raw SQL queries that return model instances: Manager. raw (raw_query, params=(), translations=None) This method takes a raw SQL query, executes it, and returns a django.
Include 1 as id to your query
Message.objects.raw('''
SELECT 1 as id , s1.ID, s1.CHARACTER_ID, MAX(s1.MESSAGE) MESSAGE, MAX(s1.c) occurrences
FROM
(SELECT ID, CHARACTER_ID, MESSAGE, COUNT(*) c
FROM tbl_message WHERE ts > DATE_SUB(NOW(), INTERVAL %s DAY) GROUP BY CHARACTER_ID,MESSAGE) s1
LEFT JOIN
(SELECT ID, CHARACTER_ID, MESSAGE, COUNT(*) c
FROM tbl_message WHERE ts > DATE_SUB(NOW(), INTERVAL %s DAY) GROUP BY CHARACTER_ID,MESSAGE) s2
ON s1.CHARACTER_ID=s2.CHARACTER_ID
AND s1.c < s2.c
WHERE s2.c IS NULL
GROUP BY CHARACTER_ID
ORDER BY occurrences DESC''', [days, days])
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