And these models are all sharing a lot of the data and duplicating attribute names and types.

We could do better.

We can declare a `UserBase` model that serves as a base for our other models. And then we can make subclasses of that model that inherit its attributes (type declarations, validation, etc).

All the data conversion, validation, documentation, etc. will still work as normally.

     * key on an absent value should result in a single call to either {@code recordLoadSuccess} or
     * {@code recordLoadException} and multiple calls to this method, despite all being served by
     * the results of a single load operation.
     *
     * @param count the number of misses to record
     * @since 11.0
     */
    void recordMisses(int count);

    /**

  // is populated only for the CSIMigration feature. It contains
  // translated fields from a pod's inline VolumeSource to a
  // PersistentVolumeSpec. This field is alpha-level and is only
  // honored by servers that enabled the CSIMigration feature.
  // +optional
  optional k8s.io.api.core.v1.PersistentVolumeSpec inlineVolumeSpec = 2;
}

// VolumeAttachmentSpec is the specification of a VolumeAttachment request.

import org.codelibs.fess.util.ResourceUtil;
import org.lastaflute.web.servlet.request.RequestManager;
import org.lastaflute.web.servlet.session.SessionManager;

import jakarta.annotation.PostConstruct;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletInputStream;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletRequest;

**FastAPI** は既に多くのアプリケーションやシステムに本番環境で使われています。また、100%のテストカバレッジを維持しています。しかし、活発な開発が続いています。

高頻度で新機能が追加され、定期的にバグが修正され、実装は継続的に改善されています。

これが現在のバージョンがいまだに `0.x.x` な理由であり、それぞれのバージョンは破壊的な変更がなされる可能性があります。これは、<a href="https://semver.org/" class="external-link" target="_blank">セマンティック バージョニング</a>の規則に則っています。

**FastAPI** を使用すると本番用アプリケーションをすぐに作成できますが (すでに何度も経験しているかもしれませんが)、残りのコードが正しく動作するバージョンなのか確認しなければいけません。

## `fastapi` のバージョンを固定

     * key on an absent value should result in a single call to either {@code recordLoadSuccess} or
     * {@code recordLoadException} and multiple calls to this method, despite all being served by
     * the results of a single load operation.
     *
     * @param count the number of misses to record
     * @since 11.0
     */
    void recordMisses(int count);

    /**

// workers name). Operations created in this context can then be executed on
// any of these remote workers by setting an appropriate device.
//
// If the following is set, all servers identified by the
// ServerDef must be up when the context is created.
TF_CAPI_EXPORT extern void TFE_ContextSetServerDef(TFE_Context* ctx,
                                                   int keep_alive_secs,

/**
 * An object with an operational state, plus asynchronous {@link #startAsync()} and {@link
 * #stopAsync()} lifecycle methods to transition between states. Example services include
 * webservers, RPC servers and timers.
 *
 * <p>The normal lifecycle of a service is:
 *
 * <ul>
 *   <li>{@linkplain State#NEW NEW} -&gt;
 *   <li>{@linkplain State#STARTING STARTING} -&gt;
 *   <li>{@linkplain State#RUNNING RUNNING} -&gt;

                this.readSize = Math.min(th.getConfig().getReceiveBufferSize() - 70, th.areSignaturesActive() ? 0xFFFF - 70 : 0xFFFFFF - 70);
            }

            // there seems to be a bug with some servers that causes corruption if using signatures + CAP_LARGE_WRITE
            if ( th.hasCapability(SmbConstants.CAP_LARGE_WRITEX) && !th.areSignaturesActive() ) {

	requestsCount: make(map[string]struct {
		success int64
		failure int64
	}),
	histogram: prometheus.NewHistogramVec(prometheus.HistogramOpts{
		Name:    "tier_ttlb_seconds",
		Help:    "Time taken by requests served by warm tier",
		Buckets: []float64{0.01, 0.1, 1, 2, 5, 10, 60, 5 * 60, 15 * 60, 30 * 60},
	}, []string{"tier"}),
}

func (t *tierMetrics) Observe(tier string, dur time.Duration) {