I've got a complex query that uses a combination of Q objects and
qargs to produce the following query:
Note the T4 alias...this is central to the question.
SELECT
`t_answer`.`id`,
`t_answer`.`question_id`,
`t_answer`.`survey_id`,
`t_answer`.`content_type_id`,
`t_intanswer`.`answer_ptr_id`,
`t_intanswer`.`value`
FROM
`t_intanswer`
INNER JOIN `t_answer` ON (`t_intanswer`.`answer_ptr_id` =
`t_answer`.`id`)
INNER JOIN `t_survey` ON (`t_answer`.`survey_id` = `t_survey`.`id`)
INNER JOIN `t_answer` T4 ON (`t_survey`.`id` = T4.`survey_id`)
INNER JOIN `t_booleananswer` ON (T4.`id` =
`t_booleananswer`.`answer_ptr_id`)
INNER JOIN `t_choiceanswer` ON (T4.`id` =
`t_choiceanswer`.`answer_ptr_id`)
INNER JOIN `t_facility` ON (`t_survey`.`facility_id` =
`t_facility`.`id`)
WHERE
(
(
(`t_booleananswer`.`value` = True AND T4.`question_id` =
1742) AND
(`t_choiceanswer`.`choice_id` = 1947 AND T4.`question_id` =
1743 )
) AND
`t_survey`.`public` = False AND
`t_survey`.`facility_id` = 82 AND
`t_survey`.`doctor_id` = 124 AND
`t_answer`.`question_id` = 1753 AND
`t_facility`.`program_id` = 71 AND
`t_survey`.`completed` IS NOT NULL AND
`t_survey`.`flagged` = False AND
`t_survey`.`completed` < '2012-05-20 00:00:00' AND
`t_survey`.`completed` > '2012-05-18 00:00:00' )
I'm looking for a result that contains either a boolean or choice
answer, but I've used Django's model inheritance, and both tables are
trying to join through t_answer.
Only one t_answer row can be returned for this query, so I get back
zero results. But I need one result. Here is the modified query in
raw SQL that solves my problem. I create a second FROM clause using
the alias T5, then I join choice on that. Works great.
SELECT
`t_answer`.`id`,
`t_answer`.`question_id`,
`t_answer`.`survey_id`,
`t_answer`.`content_type_id`,
`t_intanswer`.`answer_ptr_id`,
`t_intanswer`.`value`
FROM
`t_intanswer`
INNER JOIN `t_answer` ON (`t_intanswer`.`answer_ptr_id` =
`t_answer`.`id`)
INNER JOIN `t_survey` ON (`t_answer`.`survey_id` = `t_survey`.`id`)
INNER JOIN `t_answer` T4 ON (`t_survey`.`id` = T4.`survey_id`)
INNER JOIN `t_answer` T5 ON (`t_survey`.`id` = T5.`survey_id`)
INNER JOIN `t_booleananswer` ON (T4.`id` =
`t_booleananswer`.`answer_ptr_id`)
INNER JOIN `t_choiceanswer` ON (T5.`id` =
`t_choiceanswer`.`answer_ptr_id`)
INNER JOIN `t_facility` ON (`t_survey`.`facility_id` =
`t_facility`.`id`)
WHERE
(
(
(`t_booleananswer`.`value` = True AND T4.`question_id` =
1742) AND
(`t_choiceanswer`.`choice_id` = 1947 AND T5.`question_id` =
1743 )
) AND
`t_survey`.`public` = False AND
`t_survey`.`facility_id` = 82 AND
Cool...so I have my solution---except that I don't know how to
construct it using the Django queryset. I looked at "extra" (https://
docs.djangoproject.com/en/1.3/ref/models/querysets/#extra) but I'm not
clear on how to use it accomplish my second INNER JOIN T5.
Any thoughts experts? Thanks
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