#5745: Saving HABTM relationship deletes wrong data if there is no primary key
on
join table
------------------------------------------------------------+---------------
Reporter: [EMAIL PROTECTED] |
Type: Optimization
Status: new | Priority:
Low
Milestone: | Component:
Model
Version: RC3 | Severity:
Minor
Keywords: habtm hasandbelongstomany delete model save | Php_version:
PHP 5
Cake_version: 1.2.0.7692 RC3 |
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I guess this should also be titled "Join tables shouldn't need a primary
key".
By not reading the docs closely enough, I setup my habtm like this:
{{{
table organisations_sites
organisation_id references organisations.id
site_id references sites.id
class Organisation {
var $habtm = array("Site");
}
class Site {
var $habtm = array("Organisation");
}
}}}
I have the following data in organisations_sites
||organisation_id||site_id||
||1||21||
||2||22||
||1||22||
Seems right enough. However, when I go to save a "Site" with ID "21", the
following SQL is generated (trimmed for brevity):
{{{
DELETE FROM organisations_sites WHERE organisation_id = 1
INSERT INTO organisations_sites VALUES (1, 21);
}}}
This is bad, it deletes rows from my join table that apply to other sites.
What I expected was for this to occur instead:
{{{
DELETE FROM organisations_sites WHERE site_id = 21
INSERT INTO organisations_sites VALUES (1, 21)
}}}
I read through cake/lib/model/model.php a bit, and it looks like the
missing step is in "deleteAll"
{{{
Line 1680: return $db->delete($this, array($this->alias . '.' .
$this->primaryKey => $ids));
}}}
where $this is "OrganisationsSites".
It looks like somehow, "primaryKey" is getting the "organisation_id"
column, even though my table has no primary key, and there is none defined
in the model.
The fix is to simply add a "id integer primary key" column to the table in
the database, but perhaps the deleteAll method could be a little more
picky about the situation and not go deleting all my data when I make this
kind of mistake?
At a minimum, I would've expected it to delete by the key "site_id" which
referred to the table of the Model object that I was actually saving.
Someone with more Cake-foo than me would need to make that change however,
I suspect there are quite a few implications to changing that.
--
Ticket URL: <https://trac.cakephp.org/ticket/5745>
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