But if you have a bunch of dataclasses laying around, this is a nice trick to use them to power a web API using FastAPI. 🤓

///

## Dataclasses in `response_model`

You can also use `dataclasses` in the `response_model` parameter:

{* ../../docs_src/dataclasses/tutorial002.py hl[1,7:13,19] *}

The dataclass will be automatically converted to a Pydantic dataclass.

This way, its schema will show up in the API docs user interface:

        }
    },
    "info": {"title": "FastAPI", "version": "0.1.0"},
    "openapi": "3.1.0",
    "paths": {
        "/": {
            "get": {
                "operationId": "get_deps__get",
                "parameters": [
                    {
                        "in": "header",
                        "name": "someheader",
                        "required": True,

        "openapi": "3.1.0",
        "paths": {
            "/{repeated_alias}": {
                "get": {
                    "operationId": "get_parameters_with_repeated_aliases__repeated_alias__get",
                    "parameters": [
                        {
                            "in": "path",
                            "name": "repeated_alias",
                            "required": True,

paths:
  /documents:
    get:
      tags:
        - search
      summary: Finds documents by query
      description: Finds documents by search conditions
      operationId: searchDocuments
      parameters:
        - name: q
          in: query
          description: Search words
          required: false
          schema:
            type: string
            example: Fess
        - name: start

import java.util.Collection;
import java.util.Map;

import org.junit.Assume;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import jcifs.CIFSContext;
import jcifs.SmbConstants;
import jcifs.SmbSession;
import jcifs.internal.smb1.com.SmbComClose;
import jcifs.internal.smb1.com.SmbComNTCreateAndX;

      algorithmParameters,
      decompose = {
        listOf(
          it.algorithm,
          it.parameters,
        )
      },
      construct = {
        AlgorithmIdentifier(
          algorithm = it[0] as String,
          parameters = it[1],
        )
      },
    )

  /**
   * ```
   * BasicConstraints ::= SEQUENCE {

        val extraParameters = functionalTestExtraParameters(listOf("FlakyTestQuarantine"), os, arch, testCoverage.testJvmVersion.major.toString(), testCoverage.vendor.name)
        val parameters = (
            buildToolGradleParameters(true) +
                listOf(
                    "-PflakyTests=only",
                    "-x", ":docs:platformTest",
                    "-x", ":docs:configCacheTest",

                            },
                        },
                    },
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "required": False,
                            "schema": IsDict(
                                {

abstract class IncubatingApiReportAggregationWorkAction : WorkAction<IncubatingApiReportAggregationParameter> {
    override fun execute() {
        val byCategory = mutableMapOf<String, ReportNameToProblems>()
        parameters.reports.files.sorted().forEach { file ->
            file.forEachLine(Charsets.UTF_8) {
                val (version, _, problem) = it.split(';')
                byCategory.getOrPut(toCategory(version, file.nameWithoutExtension)) {

```

////

Betrachten wir die deklarierten Parameter:

* Obwohl diese Funktion selbst eine Abhängigkeit ist („Dependable“, etwas hängt von ihr ab), deklariert sie auch eine andere Abhängigkeit („Dependant“, sie hängt von etwas anderem ab).
    * Sie hängt von `query_extractor` ab und weist den von diesem zurückgegebenen Wert dem Parameter `q` zu.
* Sie deklariert außerdem ein optionales `last_query`-Cookie, ein `str`.