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UGQDataAccess/Repository/Query/ReserveAccountGradeQuery.cs

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+using MongoDB.Bson;
+using MongoDB.Driver;
+using System.Linq.Expressions;
+using UGQDataAccess.Repository.Models;
+using UGQDatabase.Models;
+
+
+public static class ReserveAccountGradeQuery
+{
+
+    public class AllReserveAccountGradeQueryJoin : ReserveAccountGradeEntity
+    {
+        public IEnumerable<AccountEntity> Accounts { get; set; } = null!;
+    }
+
+
+    public static Expression<Func<AllReserveAccountGradeQueryJoin, ReserveAccountGradeItemResult>> ReserveAccountGradeItemResultProjection =
+        x => new ReserveAccountGradeItemResult
+        {
+            ReserveId = x.Id.ToString(),
+            UserGuid = x.UserGuid,
+            CurrentGradeType = x.BeforeGradeType,
+            AccountId = x.Accounts.First().AccountId ?? string.Empty,
+            ReserveGradeType = x.ReserveGradeType,
+            ReserveTime = x.ReserveTime,
+            UpdatedAt = x.UpdatedAt,
+            IsCompleted = x.IsCompleted,
+        };
+
+    public static PipelineDefinition<ReserveAccountGradeEntity, T> allReserveAccountGradePipeline<T>(
+        FilterDefinition<ReserveAccountGradeEntity> filter,
+        Expression<Func<AllReserveAccountGradeQueryJoin, T>> projection)
+    {
+        var lookupStage1 = new BsonDocument("$lookup",
+            new BsonDocument
+            {
+                { "from", "Account" },
+                { "localField", "UserGuid" },
+                { "foreignField", "UserGuid" },
+                { "as", "Accounts" }
+            });
+
+        var pipeline = new EmptyPipelineDefinition<ReserveAccountGradeEntity>()
+            .Match(filter)
+            .AppendStage<ReserveAccountGradeEntity, ReserveAccountGradeEntity, AllReserveAccountGradeQueryJoin>(lookupStage1)
+            .Project(projection);
+
+        return pipeline;
+    }
+
+}