Model.filter not generating correct SQL for join clause

I have three models in a heritical order:

class CrawlProject(Model):
    name = CharField()

class CrawlGroup(Model):
    name = CharField()
    project = ForeignKeyField(CrawlProject)

class CrawlRule(Model):
    name = CharField()
    group = ForeignKeyField(CrawlGroup)

Given the following code:

CrawlRule.filter(group__project__id=47)

Then I got the following error:

 File "/home/tiger/repos/baelish/.venv/lib/python3.6/site-packages/MySQLdb/cursors.py", line 378, in _query
   db.query(q)
 File "/home/tiger/repos/baelish/.venv/lib/python3.6/site-packages/MySQLdb/connections.py", line 280, in query
   _mysql.connection.query(self, query)
eewee.OperationalError: (1054, "Unknown column 't3.project_id' in 'on clause'")

The generated SQL is like:

SELECT `t1`.`id` FROM `crawl_rule` AS `t1`
INNER JOIN `crawl_project` AS `t2`ON (`t3`.`project_id` = `t2`.`id`)
INNER JOIN `crawl_group` AS `t3` ON (`t1`.`group_id` = `t3`.`id`)
WHERE ((`t3`.`project_id` = 47)) LIMIT 20 OFFSET 0

It seems that t3 was referenced before defined.

actually, simply swapping the inner joins works:

SELECT `t1`.`id` FROM `crawl_rule` AS `t1`
INNER JOIN `crawl_group` AS `t3` ON (`t1`.`group_id` = `t3`.`id`)
INNER JOIN `crawl_project` AS `t2`ON (`t3`.`project_id` = `t2`.`id`)
WHERE ((`t3`.`project_id` = 47)) LIMIT 20 OFFSET 0

[yifeikong]

Thanks! peewee has the lowest open-issue/star ratio in all the repositories I have seen on GitHub. ^_^

[coleifer]

Fixed.