* @param <V> Value parameter type
 * @since 20.0
 */
public interface MutableValueGraph<N, V> extends ValueGraph<N, V> {

  /**
   * Adds {@code node} if it is not already present.
   *
   * <p><b>Nodes must be unique</b>, just as {@code Map} keys must be. They must also be non-null.
   *
   * @return {@code true} if the graph was modified as a result of this call
   */
  @CanIgnoreReturnValue
  boolean addNode(N node);

  /**

        assertEquals((byte) 10, FileInformation.FILE_RENAME_INFO);
    }

    /**
     * Test that constants are unique
     */
    @Test
    @DisplayName("Test FileInformation constants are unique")
    void testConstantsAreUnique() {
        byte[] constants = { FileInformation.FILE_ENDOFFILE_INFO, FileInformation.FILE_BASIC_INFO, FileInformation.FILE_STANDARD_INFO,

//go:generate msgp -file $GOFILE

// LockArgs is minimal required values for any dsync compatible lock operation.
type LockArgs struct {
	// Unique ID of lock/unlock request.
	UID string

	// Resources contains single or multiple entries to be locked/unlocked.
	Resources []string

	// Owner represents unique ID for this instance, an owner who originally requested
	// the locked resource, useful primarily in figuring out stale locks.
	Owner string

func TestSupportedDialectorWithErrForeignKeyViolated(t *testing.T) {
	tidbSkip(t, "not support the foreign key feature")

	type City struct {
		gorm.Model
		Name string `gorm:"unique"`
	}

	type Museum struct {
		gorm.Model
		Name   string `gorm:"unique"`
		CityID uint
		City   City `gorm:"Constraint:OnUpdate:CASCADE,OnDelete:CASCADE;FOREIGNKEY:CityID;References:ID"`
	}

  <artifactId>aid</artifactId>
  <groupId>gid</groupId>
  <version>0.1</version>
  <packaging>pom</packaging>

  <profiles>
    <profile>
      <id>non-unique-id</id>
    </profile>
    <profile>
      <id>non-unique-id</id>
    </profile>
  </profiles>

package tests_test

import (
	"testing"
	"time"

	"gorm.io/gorm"
)

func TestDefaultValue(t *testing.T) {
	type Harumph struct {
		gorm.Model
		Email   string    `gorm:"not null;index:,unique"`
		Name    string    `gorm:"notNull;default:foo"`
		Name2   string    `gorm:"size:233;not null;default:'foo'"`
		Name3   string    `gorm:"size:233;notNull;default:''"`
		Age     int       `gorm:"default:18"`

   * have the provided key, an empty collection is returned.
   *
   * <p>Changes to the returned collection will update the underlying multimap, and vice versa.
   *
   * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
   * returns a {@link SortedSet}, instead of the {@link java.util.Collection} specified in the
   * {@link Multimap} interface.
   */
  @Override

And Python has a special data type for sets of unique items, the `set`.

Then we can declare `tags` as a set of strings:

{* ../../docs_src/body_nested_models/tutorial003_py310.py hl[12] *}

With this, even if you receive a request with duplicate data, it will be converted to a set of unique items.

    @DisplayName("Constants Validation Tests")
    class ConstantsValidationTests {

        @Test
        @DisplayName("All fragment flags should have unique values")
        void testFragmentFlagsUniqueness() {
            // Verify that fragment flags are unique and follow bit pattern
            assertEquals(1, Integer.bitCount(DcerpcConstants.DCERPC_FIRST_FRAG), "DCERPC_FIRST_FRAG should be a single bit");

* Data validation.
* Automatic annotation and documentation.

## Other data types { #other-data-types }

Here are some of the additional data types you can use:

* `UUID`:
    * A standard "Universally Unique Identifier", common as an ID in many databases and systems.
    * In requests and responses will be represented as a `str`.
* `datetime.datetime`:
    * A Python `datetime.datetime`.