}
                                    }
                                },
                            },
                        },
                        "summary": "Update Item",
                        "operationId": "update_item_items__item_id__put",
                        "parameters": [
                            {
                                "required": True,

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Оновіть застосунок кількома моделями { #update-the-app-with-multiple-models }

Тепер трохи **відрефакторимо** застосунок, щоб підвищити **безпеку** та **гнучкість**.

  private enum HashMethod {
    MESSAGE_DIGEST_API() {
      @Override
      public byte[] hash(Algorithm algorithm, byte[] input) {
        MessageDigest md = algorithm.getMessageDigest();
        md.update(input);
        return md.digest();
      }
    },
    HASH_FUNCTION_DIRECT() {
      @Override
      public byte[] hash(Algorithm algorithm, byte[] input) {

    }

    /**
     * Inserts a new user across all authentication chains.
     * @param user The user to insert.
     */
    public void insert(final User user) {
        chains().of(stream -> stream.forEach(c -> c.update(user)));
    }

    /**
     * Changes the password for a user across all authentication chains.
     * @param username The username for which to change the password.
     * @param password The new password.

  }

  private static void assertChecksum(ImmutableSupplier<Checksum> supplier, String input) {
    byte[] bytes = HashTestUtils.ascii(input);

    Checksum checksum = supplier.get();
    checksum.update(bytes, 0, bytes.length);
    long value = checksum.getValue();

    String toString = "name";
    HashFunction func = new ChecksumHashFunction(supplier, 32, toString);
    assertThat(func.toString()).isEqualTo(toString);

urn f.innerHTML='&shy;<style media="'+a+'"> #mq-test-1 { width: 42px; }</style>',c.insertBefore(e,d),b=42===f.offsetWidth,c.removeChild(e),{matches:b,media:a}}}(a.document)}(this),function(a){"use strict";function b(){u(!0)}var c={};a.respond=c,c.update=function(){};var d=[],e=function(){var b=!1;try{b=new a.XMLHttpRequest}catch(c){b=new a.ActiveXObject("Microsoft.XMLHTTP")}return function(){return b}}(),f=function(a,b){var c=e();c&&(c.open("GET",a,!0),c.onreadystatechange=function(){4!==c.ready...

		//
		// GNU tar v1.27.1 applies global headers to subsequent records,
		// but does not do the following properly:
		//	* It does not treat an empty record as deletion.
		//	* It does not use subsequent global headers to update previous ones.
		//
		//	$ gnutar -tvf pax-global-records.tar
		//	---------- 0/0               0 2017-07-13 19:40 global1
		//	---------- 0/0               0 2017-07-13 19:40 file2

                                        }
                                    }
                                },
                            },
                        },
                        "summary": "Update Item",
                        "operationId": "update_item_items__item_id__put",
                        "parameters": [
                            {
                                "required": True,

                                        }
                                    }
                                },
                            },
                        },
                        "summary": "Update Item",
                        "operationId": "update_item_items__item_id__put",
                        "requestBody": {
                            "content": {
                                "application/json": {

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Birden Fazla Model ile Uygulamayı Güncelleme { #update-the-app-with-multiple-models }

Şimdi bu uygulamayı biraz **refactor** edelim ve **güvenliği** ile **esnekliği** artıralım.