# Query Parameter Models { #query-parameter-models }

If you have a group of **query parameters** that are related, you can create a **Pydantic model** to declare them.

This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎

/// note

This is supported since FastAPI version `0.115.0`. 🤓

///

        } catch (NullPointerException e) {
            // Expected exception
            assertNotNull(e);
        }
    }

    public void test_shutdown_multipleCalls() {
        // Test multiple shutdown calls
        AtomicInteger shutdownCount = new AtomicInteger(0);
        jobExecutor.addShutdownListener(new ShutdownListener() {
            @Override
            public void onShutdown() {

    /* 4. State verification after operations                             */
    /* ------------------------------------------------------------------ */

    @Test
    @DisplayName("Multiple reads update offset correctly")
    void testMultipleReadsUpdateOffset() {
        byte[] buffer1 = new byte[] { 0x10, 0x00, 0x00, 0x00 }; // 16
        byte[] buffer2 = new byte[] { 0x20, 0x00, 0x00, 0x00 }; // 32

        value = "\"value,with,commas\"";
        result = KuromojiCSVUtil.parse(value);
        assertEquals(1, result.length);
        assertEquals("\"value,with,commas\"", result[0]);

        // Multiple quoted values - quotes are removed
        value = "\"first\",\"second\",\"third\"";
        result = KuromojiCSVUtil.parse(value);
        assertEquals(3, result.length);
        assertEquals("first", result[0]);

            transportPool.removeTransport(null);

            // Then
            verify(transportPool).removeTransport(null);
        }

        @Test
        @DisplayName("Should remove multiple transports")
        void testRemoveMultipleTransports() {
            // Given
            SmbTransport transport2 = mock(SmbTransport.class);
            doNothing().when(transportPool).removeTransport(any());

        assertEquals("  rule with spaces  ", testRule.getRuleId());
    }

    /**
     * Test multiple registrations of same rule
     */
    public void test_multipleRegistrations() {
        testRule.setRuleId("multiRegRule");

        // Register multiple times
        testRule.register(0);
        testRule.register(0);
        testRule.register(1);

  private static BigInteger oldSlowFactorial(int n) {
    if (n <= 20) {
      return BigInteger.valueOf(LongMath.factorial(n));
    } else {
      int k = 20;
      return BigInteger.valueOf(LongMath.factorial(k)).multiply(oldSlowFactorial(k, n));
    }
  }

  /** Returns the product of {@code n1} exclusive through {@code n2} inclusive. */
  @SuppressWarnings("UseCorrectAssertInTests") // TODO(b/345814817): Remove or convert assertion.

        entry.removeChild("nonexistent.txt");
        assertTrue(entry.hasChanges()); // Still has changes from previous removal
    }

    @Test
    public void testGetChildren() {
        // Add multiple children
        entry.updateChild("file1.txt", 1024L, 1000L, false, 0x20, 500L, 800L);
        entry.updateChild("file2.txt", 2048L, 2000L, false, 0x20, 600L, 900L);

    void testJoinTwoElements() {
        String result = StringUtil.join(",", "hello", "world");
        assertEquals("hello,world", result);
    }

    @Test
    @DisplayName("Should join multiple elements with delimiter")
    void testJoinMultipleElements() {
        String result = StringUtil.join(",", "one", "two", "three", "four");
        assertEquals("one,two,three,four", result);
    }

    @Test

        esUrlFilter.setFilterType(INCLUDE);
        esUrlFilter.setUrl(url);
        insert(esUrlFilter, OpType.INDEX);
        includeFilterCache.invalidate(sessionId);
    }

    /**
     * Adds multiple include URL filters for the specified session.
     *
     * @param sessionId The session ID.
     * @param urlList The list of URL patterns to include.
     */
    @Override