资深全栈工程师招聘（远程工作-Golang/Angular技术栈）

这是一个非常典型的现代全栈职位，结合了高性能后端（Go）和复杂的前端应用（Angular）。对于符合要求的工程师来说，这是一个很好的机会。下面我将从技术角度，针对其技术栈和职责，提供一些具体的代码示例和说明。

关于Go后端技术栈（Revel/MySQL/REST API）

职位要求使用Go和Revel框架。Revel是一个全栈的、高生产力的Go Web框架。以下是一个简单的Revel控制器示例，展示了如何创建REST API端点、处理数据库操作：

// app/controllers/sleep_record.go
package controllers

import (
	"github.com/revel/revel"
	"your-app/app/models"
)

type SleepRecordController struct {
	*revel.Controller
}

// GET /api/sleep/:userId
// 获取用户睡眠记录API示例
func (c SleepRecordController) GetUserRecords(userId int) revel.Result {
	var records []models.SleepRecord
	// 使用GORM（一个流行的Go ORM，常与Revel配合使用）进行查询
	if err := models.DB.Where("user_id = ?", userId).Find(&records).Error; err != nil {
		c.Response.Status = 500
		return c.RenderJSON(map[string]string{"error": "Failed to fetch records"})
	}
	return c.RenderJSON(records)
}

// POST /api/sleep
// 创建睡眠记录API示例
func (c SleepRecordController) CreateRecord() revel.Result {
	var record models.SleepRecord
	// 解析JSON请求体
	if err := c.Params.BindJSON(&record); err != nil {
		c.Response.Status = 400
		return c.RenderJSON(map[string]string{"error": "Invalid request body"})
	}
	
	// 数据验证
	record.Validate(c.Validation)
	if c.Validation.HasErrors() {
		c.Response.Status = 400
		return c.RenderJSON(c.Validation.ErrorMap())
	}
	
	// 保存到数据库
	if err := models.DB.Create(&record).Error; err != nil {
		c.Response.Status = 500
		return c.RenderJSON(map[string]string{"error": "Failed to create record"})
	}
	
	c.Response.Status = 201
	return c.RenderJSON(record)
}

对应的模型和数据库迁移可能如下所示：

// app/models/sleep_record.go
package models

import (
	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/mysql"
	"time"
)

var DB *gorm.DB // 通常在init.go中初始化

type SleepRecord struct {
	ID              uint      `gorm:"primary_key" json:"id"`
	UserID          int       `gorm:"index;not null" json:"user_id"`
	StartTime       time.Time `json:"start_time"`
	EndTime         time.Time `json:"end_time"`
	DurationMinutes int       `json:"duration_minutes"`
	SleepQuality    int       `json:"sleep_quality"` // 1-5评分
	CreatedAt       time.Time `json:"created_at"`
	UpdatedAt       time.Time `json:"updated_at"`
}

// 验证逻辑
func (r *SleepRecord) Validate(v *revel.Validation) {
	v.Check(r.UserID, revel.Required{})
	v.Check(r.SleepQuality, revel.Min{1}, revel.Max{5})
	if r.EndTime.Before(r.StartTime) {
		v.Error("EndTime must be after StartTime")
	}
}

关于数据库模式升级

职责中提到“根据需求演变执行模式升级”。在Go中，这通常通过迁移工具（如golang-migrate）来管理。以下是迁移文件的示例：

-- migrations/20240321000001_add_heart_rate_table.up.sql
CREATE TABLE heart_rate_records (
    id INT AUTO_INCREMENT PRIMARY KEY,
    sleep_record_id INT NOT NULL,
    bpm INT NOT NULL,
    measured_at TIMESTAMP NOT NULL,
    FOREIGN KEY (sleep_record_id) REFERENCES sleep_records(id) ON DELETE CASCADE,
    INDEX idx_sleep_record_id (sleep_record_id)
);

-- migrations/20240321000001_add_heart_rate_table.down.sql
DROP TABLE heart_rate_records;

关于Angular前端（TypeScript）

对于管理仪表板，可能会使用Angular Material组件。以下是一个显示睡眠记录列表的Angular组件示例：

// src/app/sleep-records/sleep-record-list.component.ts
import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { MatTableDataSource } from '@angular/material/table';

interface SleepRecord {
  id: number;
  user_id: number;
  start_time: string;
  end_time: string;
  duration_minutes: number;
  sleep_quality: number;
}

@Component({
  selector: 'app-sleep-record-list',
  templateUrl: './sleep-record-list.component.html',
  styleUrls: ['./sleep-record-list.component.css']
})
export class SleepRecordListComponent implements OnInit {
  displayedColumns: string[] = ['id', 'user_id', 'start_time', 'duration', 'quality', 'actions'];
  dataSource = new MatTableDataSource<SleepRecord>();
  loading = false;

  constructor(private http: HttpClient) {}

  ngOnInit(): void {
    this.loadRecords();
  }

  loadRecords(): void {
    this.loading = true;
    this.http.get<SleepRecord[]>('/api/sleep/123') // 假设获取用户123的数据
      .subscribe({
        next: (data) => {
          this.dataSource.data = data;
          this.loading = false;
        },
        error: (error) => {
          console.error('Error fetching records', error);
          this.loading = false;
        }
      });
  }

  // 示例：质量评分转换为星级显示
  getQualityStars(quality: number): string {
    return '★'.repeat(quality) + '☆'.repeat(5 - quality);
  }
}

对应的模板：

<!-- src/app/sleep-records/sleep-record-list.component.html -->
<div class="container">
  <h2>Sleep Records Dashboard</h2>
  
  <div *ngIf="loading">Loading records...</div>

  <table mat-table [dataSource]="dataSource" class="mat-elevation-z8" *ngIf="!loading">
    <!-- ID Column -->
    <ng-container matColumnDef="id">
      <th mat-header-cell *matHeaderCellDef>ID</th>
      <td mat-cell *matCellDef="let record">{{record.id}}</td>
    </ng-container>

    <!-- User ID Column -->
    <ng-container matColumnDef="user_id">
      <th mat-header-cell *matHeaderCellDef>User ID</th>
      <td mat-cell *matCellDef="let record">{{record.user_id}}</td>
    </ng-container>

    <!-- Start Time Column -->
    <ng-container matColumnDef="start_time">
      <th mat-header-cell *matHeaderCellDef>Start Time</th>
      <td mat-cell *matCellDef="let record">{{record.start_time | date:'short'}}</td>
    </ng-container>

    <!-- Duration Column -->
    <ng-container matColumnDef="duration">
      <th mat-header-cell *matHeaderCellDef>Duration (min)</th>
      <td mat-cell *matCellDef="let record">{{record.duration_minutes}}</td>
    </ng-container>

    <!-- Quality Column -->
    <ng-container matColumnDef="quality">
      <th mat-header-cell *matHeaderCellDef>Quality</th>
      <td mat-cell *matCellDef="let record">
        <span class="stars">{{getQualityStars(record.sleep_quality)}}</span>
      </td>
    </ng-container>

    <!-- Actions Column -->
    <ng-container matColumnDef="actions">
      <th mat-header-cell *matHeaderCellDef>Actions</th>
      <td mat-cell *matCellDef="let record">
        <button mat-icon-button color="primary" (click)="viewDetails(record)">
          <mat-icon>visibility</mat-icon>
        </button>
      </td>
    </ng-container>

    <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
  </table>
</div>

这个职位要求工程师能够熟练地在整个技术栈中工作，从Go后端的数据库设计和API创建，到Angular前端的复杂仪表板实现。代码示例展示了如何实现一些核心职责，如创建高性能API、数据库操作和前端数据展示。