- tutorial/body.md
    - tutorial/query-params-str-validations.md
    - tutorial/path-params-numeric-validations.md
    - tutorial/query-param-models.md
    - tutorial/body-multiple-params.md
    - tutorial/body-fields.md
    - tutorial/body-nested-models.md
    - tutorial/schema-extra-example.md
    - tutorial/extra-data-types.md
    - tutorial/cookie-params.md
    - tutorial/header-params.md
    - tutorial/cookie-param-models.md

/// tip

যখন আপনি `Optional` বা `Union[Something, None]` ব্যবহার করেন এবং কোনো ডিফল্ট মান না থাকে, Pydantic-এর একটি বিশেষ আচরণ রয়েছে, আপনি Pydantic ডকুমেন্টেশনে [Required Optional fields](https://docs.pydantic.dev/latest/concepts/models/#required-optional-fields) সম্পর্কে আরও পড়তে পারেন।

///

## মেটাডাটা অ্যানোটেশন সহ টাইপ হিন্টস

    void testReadParameterWords(int expectedInt, byte[] bytes) {
        // The implementation reads via SMBUtil.readInt4 which returns an int
        // When assigned to a long field, it gets sign-extended
        int readLen = response.readParameterWordsWireFormat(bytes, 0);
        long expectedOffset = expectedInt; // Sign extension happens here for negative values

    static final GetCheckedTypeValidator BEST_VALIDATOR = getBestValidator();

    enum WeakSetValidator implements GetCheckedTypeValidator {
      INSTANCE;

      /*
       * Static final fields are presumed to be fastest, based on our experience with
       * UnsignedBytesBenchmark. TODO(cpovirk): benchmark this
       */
      /*

        "minVizHeight": 10,
        "minVizWidth": 0,
        "namePlacement": "auto",
        "orientation": "horizontal",
        "reduceOptions": {
          "calcs": [
            "mean"
          ],
          "fields": "",
          "values": false
        },
        "showUnfilled": false,
        "sizing": "auto",
        "text": {},
        "valueMode": "color"
      },
      "pluginVersion": "10.4.0",
      "targets": [

  public final boolean isSynchronized() {
    return Modifier.isSynchronized(getModifiers());
  }

  /** Returns true if the field is volatile. */
  final boolean isVolatile() {
    return Modifier.isVolatile(getModifiers());
  }

  /** Returns true if the field is transient. */
  final boolean isTransient() {
    return Modifier.isTransient(getModifiers());
  }

  @Override

 * filter. The approach is to hook into JSSE log events for the messages between client and server
 * during handshake, and then take the agreed masterSecret from private fields of the session.
 *
 * Copy WireSharkKeyLoggerListener to your test code to use in development.
 *
 * This logs TLSv1.2 on a JVM (OpenJDK 11+) without any additional code.  For TLSv1.3
 * an existing external tool is required.

* `Field(primary_key=True)` для SQLModel означает, что поле `id` является первичным ключом в таблице базы данных (вы можете подробнее узнать о первичных ключах баз данных в документации по SQLModel).

    Тип `int | None` сигнализирует для SQLModel, что столбец таблицы базы данных должен иметь тип `INTEGER`, или иметь пустое значение  `NULL`.

			if !ok {
				if preloadFields := strings.Split(association, "."); len(preloadFields) > 1 {
					relationships := &db.Statement.Schema.Relationships
					for _, field := range preloadFields {
						var ok bool
						relation, ok = relationships.Relations[field]
						if ok {
							relationships = &relation.FieldSchema.Relationships
						} else {
							db.AddError(fmt.Errorf("relation %s not found", association))

```

Notice how no connect events are fired for the second call. It reused the connection from the first request for dramatically better performance.

### EventListener.Factory