How to get all call in case ?

Just add the relationship between cases and calls in sugar studio.

Thank for your reply

I already added this.

Now I try with REST api.

Can you suggest me what method is easier than REST api or use less runtime ?

My solution use logic hook with BeanFactory in call module to check record that related with case.

$getCase = BeanFactory::getBean('Cases');

$getCase->retrieve($bean->parent_id);

if(condition){

     $getCase->status = '1';

     $getCase->save();

http://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_7.5/API/Classes/SugarBean/CRUD_Handling/…

See ref. for more information.