How to use Ajax within Sonata Admin forms?

Question

I have a Merchant entity with the following fields and associations:-

/**
 * @ORM\\ManyToMany(targetEntity=\"Category\", inversedBy=\"merchants\")
 */
public         


        

Answer 1

Very detailed post, just to update the way of override and use the edit template in the Admin class.
Now, you should do it this way:

// src/AppBundle/Admin/EntityAdmin.php  

class EntityAdmin extends Admin
{  
    public function getTemplate($name)
    {
        if ( $name == "edit" ) 
        {
            // template 'base_edit.html.twig' placed in app/Resources/views/Entity
            return 'Entity/base_edit.html.twig' ;
        }
        return parent::getTemplate($name);
    }
}

Or inject it in the service definition used the provided method, to keep the Admin class as cleaner as possible:

// app/config/services.yml  

app.admin.entity:
    class: AppBundle\Admin\EntityAdmin
    arguments: [~, AppBundle\Entity\Entity, ~]
    tags:
        - {name: sonata.admin, manager_type: orm, group: "Group", label: "Label"}
    calls:
        - [ setTemplate, [edit, Entity/base_edit.html.twig]]