Update spatie/laravel permission tables from V1 to V2

migration_permission_update_v1_to_v2.php

<?php
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class PermissionUpdateV1ToV2 extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        $tableNames = config('permission.table_names');
        $columnNames = config('permission.column_names');
        $userModelNamespace = 'App\User'; // Change this value if you didn't use default User namespace in V1
        
        // Rename V1 tables
        Schema::rename('permissions', 'permissions_v1');
        Schema::rename('roles', 'roles_v1');
        Schema::rename('role_has_permissions', 'role_has_permissions_v1');
        
        // Drop V1 foreign key constraints
        Schema::table('role_has_permissions_v1', function ($table) {
            $table->dropForeign('role_has_permissions_permission_id_foreign');
            $table->dropForeign('role_has_permissions_role_id_foreign');
        });
        
        // Create V2.28 tables
        Schema::create($tableNames['permissions'], function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('guard_name');
            $table->timestamps();
        });
        
        Schema::create($tableNames['roles'], function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('guard_name');
            $table->timestamps();
        });
        
        Schema::create($tableNames['model_has_permissions'], function (Blueprint $table) use ($tableNames, $columnNames) {
            $table->unsignedInteger('permission_id');
            $table->string('model_type');
            $table->unsignedBigInteger($columnNames['model_morph_key']);
            $table->index([$columnNames['model_morph_key'], 'model_type', ], 'model_has_permissions_model_id_model_type_index');
            $table->foreign('permission_id')
                ->references('id')
                ->on($tableNames['permissions'])
                ->onDelete('cascade');
            $table->primary(['permission_id', $columnNames['model_morph_key'], 'model_type'],
                'model_has_permissions_permission_model_type_primary');
        });
        
        Schema::create($tableNames['model_has_roles'], function (Blueprint $table) use ($tableNames, $columnNames) {
            $table->unsignedInteger('role_id');
            $table->string('model_type');
            $table->unsignedBigInteger($columnNames['model_morph_key']);
            $table->index([$columnNames['model_morph_key'], 'model_type', ], 'model_has_roles_model_id_model_type_index');
            $table->foreign('role_id')
                ->references('id')
                ->on($tableNames['roles'])
                ->onDelete('cascade');
            $table->primary(['role_id', $columnNames['model_morph_key'], 'model_type'],
                'model_has_roles_role_model_type_primary');
        });
        
        Schema::create($tableNames['role_has_permissions'], function (Blueprint $table) use ($tableNames) {
            $table->unsignedInteger('permission_id');
            $table->unsignedInteger('role_id');
            $table->foreign('permission_id')
                ->references('id')
                ->on($tableNames['permissions'])
                ->onDelete('cascade');
            $table->foreign('role_id')
                ->references('id')
                ->on($tableNames['roles'])
                ->onDelete('cascade');
            $table->primary(['permission_id', 'role_id'], 'role_has_permissions_permission_id_role_id_primary');
            
			app('cache')
                ->store(config('permission.cache.store') != 'default' ? config('permission.cache.store') : null)
                ->forget(config('permission.cache.key'));
        });
        
        // Migrate V1 tables to V2 tables
        $roles = collect(DB::table('roles_v1')->select()->get())->map(function($x) { return (array) $x + ['guard_name' => config('auth.defaults.guard')]; })->toArray();
        DB::table($tableNames['roles'])->insert($roles);
        
        $permissions = collect(DB::table('permissions_v1')->select()->get())->map(function($x) { return (array) $x + ['guard_name' => config('auth.defaults.guard')]; })->toArray();
        DB::table($tableNames['permissions'])->insert($permissions);
        
        $model_has_permissions = collect(DB::table('user_has_permissions')->select(['user_id AS model_id', 'permission_id'])->get())->map(function($x) use ($userModelNamespace) { return (array) $x + ['model_type' => $userModelNamespace]; })->toArray();
        DB::table($tableNames['model_has_permissions'])->insert($model_has_permissions);
        
        $model_has_roles = collect(DB::table('user_has_roles')->select(['user_id AS model_id', 'role_id'])->get())->map(function($x) use ($userModelNamespace) { return (array) $x + ['model_type' => $userModelNamespace]; })->toArray();
        DB::table($tableNames['model_has_roles'])->insert($model_has_roles);
        
        $role_has_permissions = collect(DB::table('role_has_permissions_v1')->select()->get())->map(function($x) { return (array) $x; })->toArray();
        DB::table($tableNames['role_has_permissions'])->insert($role_has_permissions);
        
        // Drop V1 tables
        // Remove this lines if you want to keep the renamed V1 tables
        Schema::drop('role_has_permissions_v1');
        Schema::drop('user_has_permissions');
        Schema::drop('user_has_roles');
        Schema::drop('roles_v1');
        Schema::drop('permissions_v1');
    }
    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        // WARNING: You can't rollback to V1 tables with this script!
        
        $tableNames = config('permission.table_names');
        Schema::drop($tableNames['role_has_permissions']);
        Schema::drop($tableNames['model_has_roles']);
        Schema::drop($tableNames['model_has_permissions']);
        Schema::drop($tableNames['roles']);
        Schema::drop($tableNames['permissions']);
    }
}

@fabricecw perhaps it's worth updating this gist to reflect a couple later changes that happened in the v2 schema, mainly to set the index names so they're not autogenerated which could make them too long in some cases.
Changes since 2.28.0 are visible here:
spatie/laravel-permission@2.28.0...master#diff-e56bbd7fd96f29a3a3943a532ac2cc8c

Thanks for your info!
I just updated the gist, considering:

• #973 Use config in flushing cache in migration file
• #1146 define index name

I didn't test the changes yet.

@fabricecw Shouldn't all the insert statements also use the $tableNames array instead of hard-coded strings?
For example (line 91):

DB::table($tableNames['roles'])->insert($roles);

instead of:

DB::table('roles')->insert($roles);

@Yoeriwalstra correct. I just changed the static table names to the config values. If you're able to test it, let me know if it works. Thanks!

Worked perfectly for me, amazing work.