I don't get "add button" with inline create on Backpack Laravel - php

Question

Following this documentation : https://backpackforlaravel.com/docs/4.1/crud-operation-inline-create
I try to create a link between invoices (primary) and invoices lines (secondary).
The link seems good, but I don't succeed to have the "+add" button needed to have the secondary form.
My code.
Primary class (invoiceCrudController)
<?php
namespace App\Http\Controllers\Admin;
use App\Models\Invoice;
use Backpack\CRUD\app\Http\Controllers\CrudController;
/**
* Class InvoiceCrudController
* #package App\Http\Controllers\Admin
* #property-read \Backpack\CRUD\app\Library\CrudPanel\CrudPanel $crud
*/
class InvoiceCrudController extends CrudController
{
use \Backpack\CRUD\app\Http\Controllers\Operations\ListOperation;
use \Backpack\CRUD\app\Http\Controllers\Operations\CreateOperation;
use \Backpack\CRUD\app\Http\Controllers\Operations\UpdateOperation;
use \Backpack\CRUD\app\Http\Controllers\Operations\ShowOperation;
use SetAccesses;
protected function setupCreateOperation()
{
$this->crud->setValidation(InvoiceRequest::class);
$this->crud->addFields([
/*other cases*/
[
'name' => 'invoiceLines',
'type' => 'relationship',
'tags'=> 'invoice lines',
'ajax'=>true,
[ // specify the entity in singular
'entity' => 'invoiceLine', // the entity in singular
]
],
]);
}
protected function setupUpdateOperation()
{
$this->setupCreateOperation();
}
}
secondary class (invoiceLinesController)
<?php
namespace App\Http\Controllers\Admin;
use App\Models\InvoiceLine;
use Backpack\CRUD\app\Http\Controllers\CrudController;
/**
* Class InvoiceCrudController
* #package App\Http\Controllers\Admin
* #property-read \Backpack\CRUD\app\Library\CrudPanel\CrudPanel $crud
*/
class InvoiceLinesCrudController extends CrudController
{
use \Backpack\CRUD\app\Http\Controllers\Operations\CreateOperation;
use \Backpack\CRUD\app\Http\Controllers\Operations\InlineCreateOperation;
public function setup()
{
$this->setAccesses('invoiceLine');
$this->crud->setModel('App\Models\InvoiceLine');
$this->crud->setRoute(config('backpack.base.route_prefix') . '/invoiceLine');
$this->crud->setEntityNameStrings('invoiceLine', 'invoiceLines');
$this->crud->addColumns([
[
'name' => 'slug',
'type' => 'text',
],
[
'name' => 'quantity',
'type' => 'number',
'default' => 1,
'wrapper' => [
'class' => 'form-group col-sm-6 col-md-6 col-lg-3 col-xl-3'
]
],
[
'name' =>'unit_vat_excluded',
'type' => 'text',
'wrapper' => [
'class' => 'form-group col-sm-6 col-md-6 col-lg-3 col-xl-3'
]
]
]);
}
protected function setupListOperation()
{
$this->crud->enableExportButtons();
CustomerCrudController::addFilterCustomer();
}
protected function setupCreateOperation()
{
$this->crud->addFields([
[
'name' => 'slug',
'type' => 'text',
'allows_null' => false,
],
[
'name' => 'quantity',
'type' => 'number',
'default' => 1,
'wrapper' => [
'class' => 'form-group col-sm-6 col-md-6 col-lg-3 col-xl-3'
]
],
[
'name' =>'unit_vat_excluded',
'type' => 'text',
'wrapper' => [
'class' => 'form-group col-sm-6 col-md-6 col-lg-3 col-xl-3'
]
]
]);
}
protected function setupUpdateOperation()
{
$this->setupCreateOperation();
}
protected function setupShowOperation()
{
}
public static function getColumn()
{
return [
'name' => 'invoice_line_id',
'label' => 'InvoiceLines',
'type' => 'select',
'entity' => 'invoiceLine',
'attribute' => 'pretty_print',
'model' => InvoiceLine::class,
];
}
}

Answer 1

I think the wrong is in your Filed definistion:
$this->crud->addFields([
/other cases/
[
'name' => 'invoiceLines',
'type' => 'relationship',
'tags'=> 'invoice lines',
'ajax'=>true,
[ // specify the entity in singular
'entity' => 'invoiceLine', // the entity in singular
]
],
since the relation is on to many (I guess) then the filed should be:
[
'type' => "relationship",
'name' => 'invoiceLines',
'ajax' => true,
'inline_create' => true,
]