Check if hasMany has been defined

Question

Check if hasMany has been defined

tobispace Feb '16

Created Feb '16	Last Reply Feb '16	Replies 2	Views 425	Votes 0

tobispace 12.9k

Feb '16

Hi,

I have two Models:

ModelA has an hasMany relationship to ModelB with alias ModelBs
ModelB has, of course, a belongsTo relationship to ModelA with alias ModelA

So, in my DB, table model_b has a foreign key called model_a_id to table model_a.

Every ModelA MUST have at least one ModelB.

When I create a new ModelA, how can I check if at least one ModelB has been defined?

I implemented the method beforeValidationOnCreate on ModelA where I perform this check. I don't need to check inside beforeValidation because inside ModelB I return false on method delete().

So, inside beforeValidationOnCreate() in ModelA I tried to check the following:

If $this->ModelBs is set ( isset() ) not empty: it doesn't work. ModelBs is always a Resultset\Simple.
if $this->ModelBs->count() is greater than 0: it always is (on create), even when a ModelB instance is passed.

How can I do that?

Thank you.

jcheron · Answer 1 · 2016-02-01T10:45:40-07:00

Hi,

count or sizeof are the good way :

class ModelA extends \Phalcon\Mvc\Model{
    public function beforeValidationOnCreate(){
        return sizeof($this->ModelBs)>0;
    }

tobispace · Answer 2 · 2016-02-04T07:48:35-07:00

count and sizeof always return 0 because the resultset doesn't contain any proper instance of any already existing model.

jcheron · Answer 3 · 2016-02-04T09:08:42-07:00

if you add an instance of ModelB in modelBs, count returns well 1, and creation is possible

$arrayOfBs=array(new ModelB());
$modelA->modelBs=$arrayOfBs;
$modelA->create();