{
    "_id" : ObjectId("586ca8c71a72cb07a681566d"),
    "employee_name" : "John",
    "employee_description" : "test description",
    "employee_email" : "john@email.com",
    "updated_at" : "2017-01-04 11:45:20",
    "created_at" : "2017-01-04 11:45:20"
},
{
    "_id" : ObjectId("586ca8d31a72cb07a6815671"),
    "employee_name" : "Carlos",
    "employee_description" : "test description",
    "employee_email" : "carlos@email.com",
    "updated_at" : "2017-01-04 11:45:20",
    "created_at" : "2017-01-04 11:45:20"
}

{
    "_id" : ObjectId("586ccbcf1a72cb07a6815b04"),
    "task_name" : "New Task",
    "task_description" : "test description",
    "task_status" : 1,
    "task_start" : "2017-04-01 12:00:00",
    "task_end" : "2017-04-01 02:00:00",
    "task_created_at" : "2017-04-01 02:17:00",
    "task_updated_at" : "2017-04-01 02:17:00",
    "employee_id" : [
        ObjectId("586ca8c71a72cb07a681566d"),
        ObjectId("586ca8d31a72cb07a6815671")
    ]
},
{
    "_id" : ObjectId("586cd3261a72cb07a6815c69"),
    "task_name" : "2nd Task",
    "task_description" : "test description",
    "task_status" : 1,
    "task_start" : "2017-04-01 12:00:00",
    "task_end" : "2017-04-01 02:00:00",
    "task_created_at" : "2017-04-01 02:17:00",
    "task_updated_at" : "2017-04-01 02:17:00",
    "employee_id" : ObjectId("586ca8c71a72cb07a681566d")
}

<?php
namespace AppModels;

use JenssegersMongodbEloquentModel as Eloquent;

class Employee extends Eloquent {

    protected $collection = 'employee';
    protected $primaryKey = '_id';

    public function tasks()
    {
        return $this->hasMany('AppModelsTask');
    }
}

<?php
namespace AppModels;

use JenssegersMongodbEloquentModel as Eloquent;

class Task extends Eloquent {

    protected $collection = 'task';
    protected $primaryKey = '_id';

    public function employees()
    {
        return $this->belongsTo('AppModelsEmployee');
    }
}

public function EmployeeData($data)
{
    $employees = Employee::with('tasks')->where('_id', new MongoDBBSONObjectID('586ca8d31a72cb07a6815671'))->get();
        echo "<pre>";
        print_r($employees);exit;
}

IlluminateDatabaseEloquentCollection Object
(
    [items:protected] => Array
        (
            [0] => AppModelsEmployee Object
                (
                    [connection:protected] => mongodb
                    [collection:protected] => lt_employees
                    [primaryKey:protected] => _id
                    [employee_id:AppModelsEmployee:private] =>
                    [employee_name:AppModelsEmployee:private] =>
                    [employee_description:AppModelsEmployee:private] =>
                    [employee_email:AppModelsEmployee:private] =>
                    [employee_created_at:AppModelsEmployee:private] =>
                    [employee_updated_at:AppModelsEmployee:private] =>
                    [parentRelation:protected] =>
                    [table:protected] =>
                    [keyType:protected] => int
                    [perPage:protected] => 15
                    [incrementing] => 1
                    [timestamps] => 1
                    [attributes:protected] => Array
                        (
                            [_id] => MongoDBBSONObjectID Object
                                (
                                    [oid] => 586ca8d31a72cb07a6815671
                                )

                            [employee_name] => Carlos
                            [employee_description] => test description
                            [employee_email] => carlos@email.com
                            [updated_at] => 2017-01-04 11:45:20
                            [created_at] => 2017-01-04 11:45:20
                        )

                    [original:protected] => Array
                        (
                            [_id] => MongoDBBSONObjectID Object
                                (
                                    [oid] => 586ca8d31a72cb07a6815671
                                )

                            [employee_name] => Carlos
                            [employee_description] => test description
                            [employee_email] => carlos@email.com
                            [updated_at] => 2017-01-04 11:45:20
                            [created_at] => 2017-01-04 11:45:20
                        )

                    [relations:protected] => Array
                        (
                            [tasks] => IlluminateDatabaseEloquentCollection Object
                                (
                                    [items:protected] => Array
                                        (
                                        )

                                )

                        )

                    [hidden:protected] => Array
                        (
                        )

                    [visible:protected] => Array
                        (
                        )

                    [appends:protected] => Array
                        (
                        )

                    [fillable:protected] => Array
                        (
                        )

                    [guarded:protected] => Array
                        (
                            [0] => *
                        )

                    [dates:protected] => Array
                        (
                        )

                    [dateFormat:protected] =>
                    [casts:protected] => Array
                        (
                        )

                    [touches:protected] => Array
                        (
                        )

                    [observables:protected] => Array
                        (
                        )

                    [with:protected] => Array
                        (
                        )

                    [exists] => 1
                    [wasRecentlyCreated] =>
                )

        )

)