# 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`. 🤓

///

		n = copy(buf, cr.buffer[cr.offset:])
		if n == len(buf) {
			cr.offset += n
			return n, nil
		}
		cr.offset = 0
		buf = buf[n:]
	}
	// mustRead reads from input and compares against provided slice.
	mustRead := func(b ...byte) error {
		for _, want := range b {
			got, err := cr.reader.ReadByte()
			if err == io.EOF {
				return io.ErrUnexpectedEOF
			}
			if got != want {
				if cr.debug {

	{
		"argumented macro invoked without arguments",
		lines(
			"#define X() foo ",
			"X()",
			"X",
		),
		"foo.\n.X.\n",
	},
	{
		"multiline macro without arguments",
		lines(
			"#define A 1\\",
			"\t2\\",
			"\t3",
			"before",
			"A",
			"after",
		),
		"before.\n.1.\n.2.\n.3.\n.after.\n",
	},
	{
		"multiline macro with arguments",
		lines(
			"#define A(a, b, c) a\\",
			"\tb\\",

            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        Union[int, None],
        Doc(
            """
            Maximum number of decimal places allowed for numbers.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        Optional[list[Any]],
        Doc(
            """
            Example values for this field.

            // Example from ACE interface documentation: user WNET\\alice with 0x00000003 (FILE_READ_DATA | FILE_WRITE_DATA)
            int aliceDesiredAccess = ACE.FILE_READ_DATA | ACE.FILE_WRITE_DATA;
            assertEquals(0x00000003, aliceDesiredAccess, "Alice's desired access should be 0x00000003");

            // Direct ACE: Allow WNET\\alice 0x001200A9
            int aliceDirectACE = 0x001200A9;

	//   error: An error if the statement preparation fails.
	New(ctx context.Context, key string, isTransaction bool, connPool ConnPool, locker sync.Locker) (*Stmt, error)

	// Keys returns a slice of all cache keys in the store.
	Keys() []string

	// Get retrieves a Stmt object from the store based on the given key.
	// Parameters:
	//   key: The key used to look up the Stmt object.
	// Returns:

			if _, ok := remove[id]; ok {
				continue
			}
			remainCaches = append(remainCaches, cache)
		}
		if len(remainCaches) > metacacheMaxEntries {
			// Sort oldest last...
			sort.Slice(remainCaches, func(i, j int) bool {
				return remainCaches[i].lastHandout.Before(remainCaches[j].lastHandout)
			})
			// Keep first metacacheMaxEntries...
			for _, cache := range remainCaches[metacacheMaxEntries:] {

meine
meinem
meinen
meiner
meines
mit
muss
musste
nach
nicht
nichts
noch
nun
nur
ob
oder
ohne
sehr
sein
seine
seinem
seinen
seiner
seines
selbst
sich
sie
ihnen
sind
so
solche
solchem
solchen
solcher
solches
soll
sollte
sondern
sonst
über
um
und
uns
unse
unsem
unsen

import com.google.common.annotations.J2ktIncompatible;
import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.Writer;
import org.jspecify.annotations.Nullable;

/**
 * Writer that places all output on an {@link Appendable} target. If the target is {@link Flushable}
 * or {@link Closeable}, flush()es and close()s will also be delegated to the target.
 *
 * @author Alan Green
 * @author Sebastian Kanthak

				enableSha256:    opts.enableSha256,
				enableMultipart: opts.enableMultipart,
				creds:           opts.creds,
			}

			results := globalNotificationSys.SpeedTest(ctx, sopts)
			sort.Slice(results, func(i, j int) bool {
				return results[i].Endpoint < results[j].Endpoint
			})

			totalPut := uint64(0)
			totalGet := uint64(0)
			for _, result := range results {
				totalPut += result.Uploads