After this 
section 
http://book.cakephp.org/3.0/en/orm/query-builder.html#automatically-creating-in-clauses

On Saturday, August 9, 2014 5:34:13 PM UTC+2, Thomas von Hassel wrote:
>
> where ?
>
> On 09 Aug 2014, at 17:33, José Lorenzo <[email protected]> wrote:
>
> No, I think we forgot to include it in the book. Would you be kind to do 
> that as well? :)
>
> On Saturday, August 9, 2014 5:12:04 PM UTC+2, Thomas von Hassel wrote:
>>
>> It's not really documented is it ? (or maybe i'm just blind ?) (The IS 
>> operator that is)
>>
>>
>> /thomas
>> On 09 Aug 2014, at 15:16, José Lorenzo <[email protected]> wrote:
>>
>> Nope, it was added after I created the TreeBehavior. Do you have time to 
>> submit a PR for changing that?
>>
>> On Saturday, August 9, 2014 3:12:28 PM UTC+2, Thomas von Hassel wrote:
>>>
>>> ok, because i can see in TreeBehavior you do something like this
>>>
>>> ->where(function($exp) use ($parentId, $parent) {
>>>    return $parentId === null ? $exp->isNull($parent) : $exp->eq($parent, 
>>> $parentId);
>>> })
>>>
>>> Is there a downside to using IS ?
>>>
>>>
>>> On 09 Aug 2014, at 15:11, José Lorenzo <[email protected]> wrote:
>>>
>>> ->where(['parent_id IS' => $parent_id])
>>>
>>> It will convert to NULL if needed or just use the provided value
>>>
>>> On Saturday, August 9, 2014 3:04:51 PM UTC+2, Thomas von Hassel wrote:
>>>>
>>>> Hey 
>>>>
>>>> in 2.x you could do something like this: 
>>>>
>>>> ‘conditions’ => array(‘parent_id’ => $parent_id); 
>>>>
>>>> where $parent_id could be an int or null 
>>>>
>>>> and it would find parent_id that were null in the table 
>>>>
>>>> This approach does not work in 3.x. Is there a right way to do this in 
>>>> 3.x where a field in an INT but can be null ? 
>>>>
>>>> /thomas 
>>>>
>>>>
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