add latitude & longitude

Server/Data/Model/FlowerItem.cs

@@ -8,7 +8,7 @@ namespace Blahblah.FlowerStory.Server.Data.Model;
 /// 花草对象
 /// </summary>
 [Table("flowers")]
-public class FlowerItem
+public class FlowerItem : ILocation
 {
     /// <summary>
     /// 自增 id，主键
@@ -83,4 +83,22 @@ public class FlowerItem
     /// 封面相关照片
     /// </summary>
     public ICollection<PhotoItem>? Photos { get; set; }
+
+    /// <summary>
+    /// 纬度
+    /// </summary>
+    [Column("latitude")]
+    public double? Latitude { get; set; }
+
+    /// <summary>
+    /// 经度
+    /// </summary>
+    [Column("longitude")]
+    public double? Longitude { get; set; }
+
+    /// <summary>
+    /// 距离（米）
+    /// </summary>
+    [NotMapped]
+    public int? Distance { get; set; }
 }