Hello everyone,
I upgraded my cakephp from 1.1.18 to 1.1.19.6305, I did a direct copy
of cake directory and I found that it causes segmentation fault in my
apache 2. After searching the entire web I couldn't find any solution
about it other than the ones which says just get the latest copy and
it will work. I decided to find a solution for it myself so I looked
into cakephp's code and I found the problem with model_php5 file.
Here I will try to describe my situation and the (temporary) solution
that I implemented for myself. Beware that this solution will modify
the core cakephp model_php5 file so if you don't know what your doing
then don't touch it. I only did it because my application uses lot of
auto association and 1.1.18 didn't recursively fetch associations so I
had to do something about it. I know it is not good to update the core
files, but I know what is going on in there and I can always reverse
it once new version of cakephp fixes the problem.
Back to the problem. The problem is caused when you have a self
referencing Model, cakephp goes into a bad recursion and causes
segmentation fault.
I have a model as following:
class Category extends AppModel{
var $name = 'Category';
var $belongsTo = array(
'ParentCategory'=>array(
'className'=>'Category',
'foreignKey'=>'category_id'
)
);
}
As soon as cake php reaches this association in the __construct of
model_php5 it tries to create the associations, instantiate the
association classes and create their association, because
ParentCategory is of type Category, it keeps looping in this
association forever.
The reason that it doesn't stop is because in model_php5's constructor
at line 311 cakephp puts the alias of the object in the ClassRegistry
like this:
ClassRegistry::addObject($this->alias, $this);
This is used to check if an object is created later on and it will
avoid re-creating the object which cause the recursion. the value of
$this->alias is "ParentCategory". When cakephp reaches line 466 it
checks if the object is created or not with its class name
("category")! which of course never matches because originally the
object was registered with its alias.
I changed the code in model_php5 at line 466 from this:
if (ClassRegistry::isKeySet($colKey)) {
$this->{$assoc} = ClassRegistry::getObject($colKey);
$this->{$className} = $this->{$assoc};
}
to
if (ClassRegistry::isKeySet($colKey) ||
ClassRegistry::isKeySet($model['alias'])) {
if( ClassRegistry::isKeySet($colKey))
$this->{$assoc} = ClassRegistry::getObject($colKey);
else
$this->{$assoc} = ClassRegistry::getObject($model['alias']);
$this->{$className} = $this->{$assoc};
}
and it fixed the problem.
I hope this helps someone.
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