Just functions that look the same as the *path operation functions*.

But still, it is very powerful, and allows you to declare arbitrarily deeply nested dependency "graphs" (trees).

/// tip

All this might not seem as useful with these simple examples.

But you will see how useful it is in the chapters about **security**.

And you will also see the amounts of code it will save you.

<img src="/img/tutorial/path-operation-configuration/image01.png">

### Tags with Enums { #tags-with-enums }

If you have a big application, you might end up accumulating **several tags**, and you would want to make sure you always use the **same tag** for related *path operations*.

In these cases, it could make sense to store the tags in an `Enum`.

You can create production applications with **FastAPI** right now (and you have probably been doing it for some time), you just have to make sure that you use a version that works correctly with the rest of your code.

## Pin your `fastapi` version { #pin-your-fastapi-version }

}

// JoinNestedRelationNames nested relationships like `Manager__Company`
func JoinNestedRelationNames(relationNames []string) string {
	return strings.Join(relationNames, nestedRelationSplit)
}

// RTrimSlice Right trims the given slice by given length
func RTrimSlice[T any](v []T, trimLen int) []T {
	if trimLen >= len(v) { // trimLen greater than slice len means fully sliced
		return v[:0]
	}

      # - 24 for running Javadoc and javac (to help people who build Guava locally and might not use a recent JDK to run Maven)
      - name: 'Set up JDKs'
        uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
        with:
          java-version: |
            ${{ matrix.java }}

         *
         * @return The {@link Path} to the artifact.
         */
        Path getPath();

        /**
         * Indicates whether the requested artifact was resolved. Note that the artifact might have been successfully
         * resolved despite {@link #getExceptions()} indicating transfer errors while trying to fetch the artifact from some
         * of the specified remote repositories.
         *

      return key;
    }

    @Override
    @ParametricNullness
    public V getValue() {
      updateIndex();
      /*
       * If the entry has been removed from the map, we return null, even though that might not be a
       * valid value. That's the best we can do, short of holding a reference to the most recently
       * seen value. And while we *could* do that, we aren't required to: Map.Entry explicitly says

    private int testAccess;

    @BeforeEach
    void setUp() {
        mockPolicyHandle = mock(SamrPolicyHandle.class);
        testServer = "testServer";
        testAccess = 0x02000000; // SAM_SERVER_CONNECT access right
    }

    @Test
    @DisplayName("Should construct with correct parameters")
    void constructorShouldInitializeFieldsCorrectly() {
        // When

                            <la:message key="labels.dict_mapping_title"/>
                        </h1>
                    </div>
                    <div class="col-sm-6">
                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item"><la:link href="/admin/dict">
                                <la:message key="labels.dict_list_link"/>
                            </la:link></li>

                    <c:if test="${!displayCreateLink}">
                        <la:link href="/admin/fileconfig/" styleClass="btn btn-primary ${f:h(editableClass)}">
                            <em class="fa fa-arrow-circle-right">
                            <la:message key="labels.file_auth_create_file_config"/>
                        </la:link>
                    </c:if>
                    <c:if test="${displayCreateLink}">