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Minor correction to docs, fix for sql error, fix to preSelect dql callback #10
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… filtering comments by blog post). Error was relating to incorrect parameter count. After some trial and error, passing 0 (suppresses limit subquery) to getSqlQuery as it's second argument fixes this. I've seen no side effects yet ... should be ok, as i think the aim is to make doctrine create the query, the limit subquery isn't needed.
…ener to fix two bugs, as detailed below.
Suppose you have:
Categories, which have many Posts. You also have an Image object.
Both "Category" and "Post" are LooselyCoupled to "Image".
If you try to do a query like this:
Doctrine::getTable('Category')->createQuery('c')
->leftJoin('c.Images ci')
->leftJoin('c.Post p')
->leftJoin('p.Images pi');
things go a bit wrong - key bit is that the same LooselyCoupleable component (Image) is joined twice to two different components (Post and Category).
We end up with SQL that looks like:
...
FROM category c
LEFT JOIN post p ON c.id = p.category_id
LEFT JOIN image i ON c.id = i.obj_pk AND (i.obj_type = "Category") AND (i.obj_type = "Category")
LEFT JOIN image i2 ON p.id = i2.obj_pk AND (i2.obj_type = "Category") AND (i2.obj_type = "Category")
...
Two things wrong here:
1. The obj_type is always the root alias/component of the query (I think it goes even more wrong if the root component is not part of a LooselyCoupled relationship)
2. Inconsequential, but annoying - the obj_type condition is added twice to each join.
This patch makes it create the expected:
...
FROM category c
LEFT JOIN Post p ON c.id = p.category_id
LEFT JOIN image i ON c.id = i.obj_pk AND (i.obj_type = "Category")
LEFT JOIN image i2 ON p.id = i2.obj_pk AND (i2.obj_type = "Post")
...
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Added additional commit - see commit log for details, fixes issue with preDQLSelect listener. |
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