When you create a **FastAPI** *path operation* you can normally return any data from it: a `dict`, a `list`, a Pydantic model, a database model, etc.

By default, **FastAPI** would automatically convert that return value to JSON using the `jsonable_encoder` explained in [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

	"net/http"
)

var (
	// ErrPermission is an error returned by the KMS when it has not
	// enough permissions to perform the operation.
	ErrPermission = Error{
		Code:    http.StatusForbidden,
		APICode: "kms:NotAuthorized",
		Err:     "insufficient permissions to perform KMS operation",
	}

	// ErrKeyExists is an error returned by the KMS when trying to
	// create a key that already exists.
	ErrKeyExists = Error{

And then, right after the `yield`, we unload the model. This code will be executed **after** the application **finishes handling requests**, right before the *shutdown*. This could, for example, release resources like memory or a GPU.

/// tip

The `shutdown` would happen when you are **stopping** the application.

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	}

	// When changing a field with a default value, the change must occur
	animal.Name = "amazing horse"
	DB.Save(&animal)
	DB.First(&animal, animal.Counter)
	if animal.Name != "amazing horse" {
		t.Errorf("Update a filed with a default value should occur. But got %v\n", animal.Name)
	}

	// When changing a field with a default value with blank value
	animal.Name = ""

    assertTrue(executor.isTerminated());

    otherTask.get();
  }

  /**
   * Test for a bug where threads weren't getting signaled when shutdown was called, only when tasks
   * completed.
   */
  public void testDirectExecutorService_awaitTermination_missedSignal() {
    ExecutorService service = newDirectExecutorService();
    Thread waiter =

  First it marked out a race-course, in a sort of circle, (`the
exact shape doesn't matter,' it said,) and then all the party
were placed along the course, here and there.  There was no `One,
two, three, and away,' but they began running when they liked,
and left off when they liked, so that it was not easy to know
when the race was over.  However, when they had been running half
an hour or so, and were quite dry again, the Dodo suddenly called

    @BeforeEach
    void setUp() {
        when(mockContext.getConfig()).thenReturn(mockConfig);
        when(mockConfig.isUseMultiChannel()).thenReturn(true);
        when(mockConfig.getMaxChannels()).thenReturn(4);
        when(mockConfig.getChannelBindingPolicy()).thenReturn(1); // preferred
        when(mockConfig.getLoadBalancingStrategy()).thenReturn("adaptive");
        when(mockConfig.getChannelHealthCheckInterval()).thenReturn(10);

        // Arrange
        NbtAddress nbtMock = mock(NbtAddress.class);
        when(nbtMock.nextCalledName()).thenReturn("NEXT");
        UniAddress ua = new UniAddress(nbtMock);
        // Act
        String next = ua.nextCalledName();
        // Assert
        assertEquals("NEXT", next, "nextCalledName should delegate to NbtAddress when called");
    }

    @Test

/// tip

You normally have to do this only **once**, when you create the virtual environment.

///

## Deactivate the Virtual Environment { #deactivate-the-virtual-environment }

Once you are done working on your project you can **deactivate** the virtual environment.

<div class="termy">

```console
$ deactivate
```

</div>