Backpack CRUD Controller: show fields depending on model is editing

Question

Can I setup CRUD Controller in the way to show fields depending on model is editing?

Example: I have model with fields: id, type, field1, field2.

For models with type=type1 I want to show only field1:

$this->crud->addFields([
    ['name' => 'field1', 'label' => 'field1 label']
]);

for models with type=type2 only field2:

$this->crud->addFields([
    ['name' => 'field2', 'label' => 'field2 label']
]);

for models with type=type3 both field1 and field2:

$this->crud->addFields([
    ['name' => 'field1', 'label' => 'field1 label'],
    ['name' => 'field2', 'label' => 'field2 label']
]);

Answer 1

At the very bottom of this page in the docs it lists:

Inside your custom field type, you can use these variables:

...

$entry - in the Update operation, the current entry being modified (the actual values);

One way to achieve this would be to use custom fields and leverage that $entry variable. For example, you could make 2 custom fields like this:

field1.blade.php

@if(in_array($entry->type, ['type1','type3']))
    {{--  your field content here, see resources/views/vendor/backpack/crud/fields/text.blade.php as an example --}}
@endif

field2.blade.php

@if(in_array($entry->type, ['type2','type3']))
    {{--  you can even pull in the content of an existing field like this  --}}
    @include('crud::fields.text')
@endif

Then, in your controller, you'd always add both fields and let the fields themselves do the work of hiding the proper ones.

 $this->crud->addFields([
        [
            'name' => 'field1', 
            'label' => 'field1 label',
            'type'  => 'field1',
        ],
        [
            'name' => 'field2', 
            'label' => 'field2 label',
            'type'  => 'field2',
        ]
    ]);