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abp vnext Find异常

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悬赏园豆:5 [已关闭问题] 关闭于 2020-11-10 13:30

abp vnext 中使用Find方法报下面错误,这个肯定是ef core自身解析lambda的问题,不知道啥问题。

我的查询:

 var order = await _paymentRecordRepository.FindAsync(o => o.OrderId == input.OrderNo && o.TotalAmount>0,false);

异常信息:

The LINQ expression 'DbSet<PaymentsRecord>
.Where(p => __ef_filter__p_0 || (Nullable<Guid>)EF.Property<Guid>(p, "TenantId") == __ef_filter__CurrentTenantId_1)
.Where(p => p.TotalAmount > 0)' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to either AsEnumerable(), AsAsyncEnumerable(), ToList(), or ToListAsync(). See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.

abp vnext实现:

public override async Task<TEntity> FindAsync(
            Expression<Func<TEntity, bool>> predicate,
            bool includeDetails = true,
            CancellationToken cancellationToken = default)
{
     return includeDetails
         ? await WithDetails()
                .Where(predicate)
                .SingleOrDefaultAsync(GetCancellationToken(cancellationToken))
            : await DbSet
                .Where(predicate)
                .SingleOrDefaultAsync(GetCancellationToken(cancellationToken));
}
问题补充:

abp vnext中默认使用的是System.Linq.Dynamic.Core中的Where.
不知道为啥就是>和<不能解析,==和!=就能解析。

代码如下:

public static IQueryable Where(this IQueryable source, LambdaExpression lambda)
    {
      Check.NotNull<IQueryable>(source, nameof (source));
      Check.NotNull<LambdaExpression>(lambda, nameof (lambda));
      Expression expression = DynamicQueryableExtensions.OptimizeExpression((Expression) Expression.Call(typeof (Queryable), nameof (Where), new Type[1]
      {
        source.ElementType
      }, source.Expression, (Expression) Expression.Quote((Expression) lambda)));
      return source.Provider.CreateQuery(expression);
    }
Jonny-Xhl的主页 Jonny-Xhl | 小虾三级 | 园豆:648
提问于:2020-11-10 12:48
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所有回答(1)
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这是因为单元测试使用的是Sqllte数据库,对于decimal类型需要进行转换。
参考:

if (IsDatabaseProvider(builder, options, EfCoreDatabaseProvider.MySql))
{
       b.Property(p => p.FinishTime).HasColumnType("date");
       b.Property(p => p.RealityAmount).HasColumnType("decimal(6,2)");
       b.Property(p => p.CurrentTotalAmount).HasColumnType("decimal(6,2)").IsRequired();
       b.Property(p => p.TotalAmount).HasColumnType("decimal(6,2)").IsRequired();
 }
 else if (IsDatabaseProvider(builder, options, EfCoreDatabaseProvider.SqlServer))
 {
       b.Property(p => p.FinishTime).HasColumnType("datetime");
       b.Property(p => p.RealityAmount).HasColumnType("decimal(6,2)");
       b.Property(p => p.CurrentTotalAmount).HasColumnType("decimal(6,2)").IsRequired();
       b.Property(p => p.TotalAmount).HasColumnType("decimal(6,2)").IsRequired();
  }
   else if (IsDatabaseProvider(builder, options, EfCoreDatabaseProvider.Sqlite))
  {
         b.Property(p => p.FinishTime).HasColumnType("datetime");
         b.Property(p => p.RealityAmount).HasConversion<double>();
         b.Property(p => p.CurrentTotalAmount).HasConversion<double>().IsRequired();
         b.Property(p => p.TotalAmount).HasConversion<double>().IsRequired();
   }                
Jonny-Xhl | 园豆:648 (小虾三级) | 2020-11-10 13:30
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