単一のヒーローを取得します:

{* ../../docs_src/sql_databases/tutorial002_an_py310.py ln[75:80] hl[77] *}

### `HeroUpdate` で Hero を更新 { #update-a-hero-with-heroupdate }

ヒーローを更新できます。ここでは HTTP の `PATCH` を使います。

コードでは、クライアントが送ったデータのみ（デフォルト値として入ってくる値は除外）を持つ `dict` を取得します。これには `exclude_unset=True` を使います。これが主なコツです。🪄

その後、`hero_db.sqlmodel_update(hero_data)` を使って、`hero_db` を `hero_data` の内容で更新します。

    /** The key of the message: {item} must be a past value. */
    public static final String CONSTRAINTS_Past_MESSAGE = "{constraints.Past.message}";

    /** The key of the message: {item} does not match "{regexp}". */
    public static final String CONSTRAINTS_Pattern_MESSAGE = "{constraints.Pattern.message}";

    /** The key of the message: The size of {item} must be between {min} and {max}. */

我们可以**读取**单个 hero：

{* ../../docs_src/sql_databases/tutorial002_an_py310.py ln[75:80] hl[77] *}

### 使用 `HeroUpdate` 更新单个 Hero { #update-a-hero-with-heroupdate }

我们可以**更新**单个 hero。为此，我们会使用 HTTP 的 `PATCH` 操作。

在代码中，我们会得到一个 `dict`，其中包含客户端发送的所有数据，**只有客户端发送的数据**，并排除了任何一个仅仅作为默认值存在的值。为此，我们使用 `exclude_unset=True`。这是最主要的技巧。🪄

然后我们会使用 `hero_db.sqlmodel_update(hero_data)`，来利用 `hero_data` 的数据更新 `hero_db`。

	n, err := tw.curr.Write(b)
	if err != nil && err != ErrWriteTooLong {
		tw.err = err
	}
	return n, err
}

// readFrom populates the content of the current file by reading from r.
// The bytes read must match the number of remaining bytes in the current file.
//
// If the current file is sparse and r is an io.ReadSeeker,
// then readFrom uses Seek to skip past holes defined in Header.SparseHoles,

	"strings"
	"testing"
	"time"
)

type testError struct{ error }

type fileOps []any // []T where T is (string | int64)

// testFile is an io.ReadWriteSeeker where the IO operations performed
// on it must match the list of operations in ops.
type testFile struct {
	ops fileOps
	pos int64
}

func (f *testFile) Read(b []byte) (int, error) {
	if len(b) == 0 {
		return 0, nil
	}
	if len(f.ops) == 0 {

func init() {
	testBytes = make([]byte, N)
	for i := 0; i < N; i++ {
		testBytes[i] = 'a' + byte(i%26)
	}
	testString = string(testBytes)
}

// Verify that contents of buf match the string s.
func check(t *testing.T, testname string, buf *Buffer, s string) {
	bytes := buf.Bytes()
	str := buf.String()
	if buf.Len() != len(bytes) {

    // Compare that the graphs match.
    GraphDef expected_gdef;
    GraphDef gdef;
    EXPECT_TRUE(GetGraphDef(expected_graph_, &expected_gdef));
    EXPECT_TRUE(GetGraphDef(graph_, &gdef));
    TF_EXPECT_GRAPH_EQ(expected_gdef, gdef);

    // Compare that the output of the gradients of both graphs match.
    RunGraphsAndCompareOutputs(grad_outputs, expected_grad_outputs);
  }

	// execute the request.
	response, err = s.client.Do(req)
	c.Assert(err, nil)
	if s.signer == signerV4 {
		verifyError(c, response, "XAmzContentSHA256Mismatch", "The provided 'x-amz-content-sha256' header does not match what was computed.", http.StatusBadRequest)
	}
}

// Test deletes multiple objects and verifies server response.
func (s *TestSuiteCommon) TestDeleteMultipleObjects(c *check) {
	// generate a random bucket name.

	var buf bytes.Buffer
	tw := NewWriter(&buf)
	if err := tw.AddFS(fsys); err != nil {
		t.Fatal(err)
	}
	if err := tw.Close(); err != nil {
		t.Fatal(err)
	}

	// Add subfolder into fsys to match what we'll read from the tar.
	fsys["subfolder"] = &fstest.MapFile{Mode: 0o555 | os.ModeDir}

	// Test that we can get the files back from the archive
	tr := NewReader(&buf)

			return err
		}
		err = werr
	}
}

// stringsHasPrefixFold tests whether the string s begins with prefix ignoring case.
func stringsHasPrefixFold(s, prefix string) bool {
	// Test match with case first.
	return len(s) >= len(prefix) && (s[0:len(prefix)] == prefix || strings.EqualFold(s[0:len(prefix)], prefix))
}

func ptr[T any](a T) *T {
	return &a
}