EF 5 和事务表

问题描述

这是我第一次使用 EF5，我不太清楚如何执行此操作： 我有以下数据库架构： schema

我需要创建一个返回（实际上我需要一个 CRUD）设备（来自 Devices 表）及其属性（来自其他 3 个表）的端点 但是端点发送了错误：

Unable to determine the relationship represented by navigation 'Device.DeviceDevicePropertyValues' of type 'ICollection<DeviceDevicePropertyValue>'. Either manually configure the relationship,or ignore this property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.

问题是我不知道在哪里手动配置relationShip；我没有使用“OnModelCrating”方法或那些东西。

这是我的代码：

设备实体：

[Table("Devices")]
    public class Device
    {
        [Key]
        [required(ErrorMessage = "DevicesID is required")]
        public int deviceid { get; set; }

        [required(ErrorMessage = "Name is required")]
        [StringLength(30,ErrorMessage = "Name can't be longer than 30 characters")]
        public string Name { get; set; }

        [ForeignKey(nameof(Shop))]
        public int ShopID { get; set; }

        [ForeignKey(nameof(User))]
        public int GroupID { get; set; }

        public ICollection<DeviceDevicePropertyValue> DeviceDevicePropertyValues { get; set; }
    }

DeviceDevicePropertyValue 实体

[Keyless]
    [Table("Device_DevicePropertyValue")]
    public class DeviceDevicePropertyValue
    {
        public DeviceDevicePropertyValue()
        {
        }
        [ForeignKey(nameof(Device))]
        [required(ErrorMessage = "deviceid is required")]
        public int deviceid { get; set; }

        [ForeignKey(nameof(DevicePropertyValue))]
        [required(ErrorMessage = "DevicePropertyValueID is required")]
        public int DevicePropertyValueID { get; set; }

    }

DevicePropertyValue 实体

    [Table("DevicePropertyValues")]
    public class DevicePropertyValue
    {
        [Key]
        [required(ErrorMessage = "DevicePropertyValueID is required")]
        public int DevicePropertyValueID { get; set; }

        [required(ErrorMessage = "Name is required")]
        [StringLength(30,ErrorMessage = "Name can't be longer than 30 characters")]
        public string Name { get; set; }

        [ForeignKey(nameof(DevicePropertyField))]
        [required(ErrorMessage = "DevicePropertyFieldID is required")]
        public int DevicePropertyFieldID { get; set; }
    }

DevicePropertyField 实体

    [Table("DevicePropertyFields")]
    public class DevicePropertyField
    {
        [Key]
        [required(ErrorMessage = "DevicePropertyFieldID is required")]
        public int DevicePropertyFieldID { get; set; }

        [required(ErrorMessage = "Name is required")]
        [StringLength(30,ErrorMessage = "Name can't be longer than 30 characters")]
        public string Name { get; set; }
    }

在 DeviceRepository 上我有：

        public async Task<IEnumerable<Device>> GetAllDevicesinformation()
        {
            return await FindAll()
             .OrderBy(device => device.deviceid)
             .Include(deviceInfo => deviceInfo.DeviceDevicePropertyValues)
             .ToListAsync();
        }

在 RepostoryBase 我有：

        public IQueryable<T> FindAll()
        {
            return this.RepositoryContext.Set<T>().AsNoTracking();
        }

最后，在我的 DeviceController 中，我有这个：

        [HttpGet("all")]
        public async Task<IActionResult> GetAllDevicesinformation()
        {
            try
            {
                var devices = await _repository.Device.GetAllDevicesinformation();
                _logger.LogInfo($"Returned all devices information from database.");

                var devicessResult = _mapper.Map<IEnumerable<DeviceDto>>(devices);
                return Ok(devicessResult);
            }
            catch (Exception ex)
            {
                _logger.LogError($"Something went wrong inside GetAllDevicesinformation action: {ex.Message}");
                return StatusCode(500,"Internal server error");
            }
        }

我正在 StackOverflow 上的其他帖子中搜索答案，但我不明白它或不适合我

非常感谢您的回答！

解决方法

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