# Extra Models { #extra-models }

Continuing with the previous example, it will be common to have more than one related model.

This is especially the case for user models, because:

* The **input model** needs to be able to have a password.
* The **output model** should not have a password.
* The **database model** would probably need to have a hashed password.

/// danger

                                    "application/json": {
                                        "schema": {
                                            "title": "Response Response Model List Of Model No Annotation Response Model List Of Model No Annotation Get",
                                            "type": "array",
                                            "items": {

# Query Parameter Models { #query-parameter-models }

If you have a group of **query parameters** that are related, you can create a **Pydantic model** to declare them.

This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎

/// note

This is supported since FastAPI version `0.115.0`. 🤓

///

    model: CIBuildModel,
    stage: Stage,
    os: Os? = null,
) = stageTriggerUuid(model, stage.stageName, os)

fun stageTriggerId(
    model: CIBuildModel,
    stageName: StageName,
    os: Os? = null,
) = "${model.projectId}_Stage_${stageName.id}_${osSuffix(os)}Trigger"

fun stageTriggerUuid(
    model: CIBuildModel,
    stageName: StageName,
    os: Os? = null,

    },
    BuildLogicTest {
        override fun create(
            model: CIBuildModel,
            stage: Stage,
            flakyTestStrategy: FlakyTestStrategy,
        ): OsAwareBaseGradleBuildType = BuildLogicTest(model, stage)
    },
    BuildDistributions {
        override fun create(
            model: CIBuildModel,
            stage: Stage,

     *
     * This method will be called on each raw model being loaded,
     * just before validation.
     *
     * @param model the input model
     * @return the transformed model, or the input model if no transformation is needed
     * @throws ModelTransformerException
     */
    @Nonnull
    default Model transformRawModel(@Nonnull Model model) throws ModelTransformerException {
        return model;
    }

    /**

 * under the License.
 */
package org.apache.maven.model.normalization;

import org.apache.maven.model.Model;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblemCollector;

/**
 * Handles normalization of a model. In this context, normalization is the process of producing a canonical
 * representation for models that physically look different but are semantically equivalent.
 *

import jetbrains.buildServer.configs.kotlin.RelativeId
import model.CIBuildModel
import model.FlameGraphGeneration
import model.FunctionalTestBucketProvider
import model.GRADLE_BUILD_SMOKE_TEST_NAME
import model.PerformanceTestBucketProvider
import model.PerformanceTestCoverage
import model.SpecificBuild
import model.Stage
import model.StageName
import model.TestCoverage
import model.TestType

class StageProject(
    model: CIBuildModel,

    directly to JSON bytes via Pydantic when a return type or response model is
    set, which is faster and doesn't need a custom response class.

    Read more in the
    [FastAPI docs for Custom Response](https://fastapi.tiangolo.com/advanced/custom-response/#orjson-or-response-model)
    and the
    [FastAPI docs for Response Model](https://fastapi.tiangolo.com/tutorial/response-model/).

    return {"p": p}


class HeaderModelOptionalStr(BaseModel):
    p: str | None = None


@app.get("/model-optional-str")
async def read_model_optional_str(p: Annotated[HeaderModelOptionalStr, Header()]):
    return {"p": p.p}


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_schema(path: str):