snipe-it/routes/web/fields.php

<?php
/*
* Custom Fields Routes
*/

Route::group(['prefix' => 'fields', 'middleware' => ['auth']], function () {
    Route::get('required/{fieldset_id}/{field_id}',
        ['uses' => 'CustomFieldsetsController@makeFieldRequired',
            'as' => 'fields.required', ]
    );

    Route::get('optional/{fieldset_id}/{field_id}',
        ['uses' => 'CustomFieldsetsController@makeFieldOptional',
            'as' => 'fields.optional', ]
    );

    Route::get('{field_id}/fieldset/{fieldset_id}/disassociate',
        ['uses' => 'CustomFieldsController@deleteFieldFromFieldset',
        'as' => 'fields.disassociate', ]
    );

    Route::post('fieldsets/{id}/associate',
        ['uses' => 'CustomFieldsetsController@associate',
        'as' => 'fieldsets.associate', ]
    );

    Route::resource('fieldsets', 'CustomFieldsetsController', [
    'parameters' => ['fieldset' => 'field_id', 'field' => 'field_id'],
    ]);
});

Route::resource('fields', 'CustomFieldsController', [
    'middleware' => ['auth'],
    'parameters' => ['field' => 'field_id', 'fieldset' => 'fieldset_id'],
]);