Syntax error or access violation: 1701 Cannot truncate a table referenced in a foreign key constraint (`libraryDB`.`lendings`, CONSTRAINT `lendings_parnetid_foreign`) (SQL: truncate table `parnets`) code example

Example: Syntax error or access violation: 1701 Cannot truncate a table referenced in a foreign key constraint

As the error says, you can not truncate tables referenced by foreign keys. 
Delete should work though...

DB::table('some_table')->delete();