t.Fatalf("Blog should has three tags after Append")
	}

	if count := DB.Model(&blog).Association("Tags").Count(); count != 3 {
		t.Fatalf("Blog should has 3 tags after Append, got %v", count)
	}

	var tags []Tag
	DB.Model(&blog).Association("Tags").Find(&tags)
	if !compareTags(tags, []string{"tag1", "tag2", "tag3"}) {
		t.Fatalf("Should find 3 tags")
	}

	var blog1 Blog
	DB.Preload("Tags").Find(&blog1)

        String[] tags1 = { "tag1", "tag2" };
        String[] tags2 = { "tag2", "tag1" };
        String[] roles = { "role1" };
        String[] fields = { "field1" };
        String[] excludes = { "exclude1" };

        String result1 = popularWordHelper.getCacheKey(seed, tags1, roles, fields, excludes);
        String result2 = popularWordHelper.getCacheKey(seed, tags2, roles, fields, excludes);

        transformer.putResultDataBody(dataMap, "tags", "tag1");

        // Second addition with array
        String[] tags2 = new String[] { "tag2", "tag3" };
        transformer.putResultDataBody(dataMap, "tags", tags2);

        // Third addition with another array
        String[] tags3 = new String[] { "tag4", "tag5" };
        transformer.putResultDataBody(dataMap, "tags", tags3);

        Object result = dataMap.get("tags");

 */
internal sealed class Tags {
  /**
   * Returns a tags instance that maps [key] to [value]. If [value] is null, this returns a tags
   * instance that does not have any mapping for [key].
   */
  abstract fun <T : Any> plus(
    key: KClass<T>,
    value: T?,
  ): Tags

  abstract operator fun <T : Any> get(key: KClass<T>): T?
}

/** An empty tags. This is always the tail of a [LinkedTags] chain. */

    @Test
    public void test_parse() {
        PrunedTag[] tags = PrunedTag.parse("");
        assertEquals(0, tags.length);

        tags = PrunedTag.parse("a");
        assertEquals(1, tags.length);
        assertEquals("PrunedTag [tag=a, id=null, css=null, attrName=null, attrValue=null]", tags[0].toString());

        tags = PrunedTag.parse("a#test");
        assertEquals(1, tags.length);

        "price": 50.2,
        "tax": 10.5,
        "tags": [],
    }


def test_patch_all(client: TestClient):
    response = client.patch(
        "/items/foo",
        json={
            "name": "Fooz",
            "description": "Item description",
            "price": 3,
            "tax": 10.5,
            "tags": ["tag1", "tag2"],
        },
    )
    assert response.json() == {

        .plus(Boolean::class, null)
    assertThat(tags).isEqualTo(EmptyTags)
    assertThat(tags.toString()).isEqualTo("{}")
  }

  @Test
  fun removeAbsentFromEmpty() {
    val tags = EmptyTags.plus(String::class, null)
    assertThat(tags).isEqualTo(EmptyTags)
    assertThat(tags.toString()).isEqualTo("{}")
  }

  @Test
  fun removeAbsentFromNonEmpty() {
    val tags =
      EmptyTags

/// tip

You don't have to add metadata for all the tags that you use.

///

### Use your tags { #use-your-tags }

Use the `tags` parameter with your *path operations* (and `APIRouter`s) to assign them to different tags:

{* ../../docs_src/metadata/tutorial004_py310.py hl[21,26] *}

/// info

Read more about tags in [Path Operation Configuration](path-operation-configuration.md#tags).

///

from enum import Enum

from fastapi import FastAPI

app = FastAPI()


class Tags(Enum):
    items = "items"
    users = "users"


@app.get("/items/", tags=[Tags.items])
async def get_items():
    return ["Portal gun", "Plumbus"]


@app.get("/users/", tags=[Tags.users])
async def read_users():

/// tip | Astuce

Vous n’avez pas à ajouter des métadonnées pour tous les tags que vous utilisez.

///

### Utiliser vos tags { #use-your-tags }

Utilisez le paramètre `tags` avec vos *chemins d'accès* (et `APIRouter`s) pour les affecter à différents tags :

{* ../../docs_src/metadata/tutorial004_py310.py hl[21,26] *}

/// info

En savoir plus sur les tags dans [Configuration de chemins d'accès](path-operation-configuration.md#tags).