orchardcms - 当我尝试在 Orchard CMS 中预览查询时出现此错误

Question

我创建了一个新查询，当我尝试预览它时，我收到以下错误。

我点击此链接并创建了一个内容类型 Book 并将内容部分产品添加到其中。

http://skywalkersoftwaredevelopment.net/blog/writing-an-orchard-webshop-module-from-scratch-part-5

无法执行查询

[ 选择不同的 TOP (@p0) contentite0_.Id 作为 col_0_0_ 从 Orchard_Framework_ContentItemVersionRecord contentite0_ 内部连接 ​​Orchard_Framework_ContentItemRecord contentite1_ on contentite0_.ContentItemRecord_id=contentite1_.Id 内部连接 ​​Customer_ProductPartRecord productpar2_ on contentite1_.Id=productpar2_.Id 其中 contentite0_.Published=1 按 contentite0_ 排序。 ID ]

[SQL: select distinct TOP (@p0) contentite0_.Id as col_0_0_ from Orchard_Framework_ContentItemVersionRecord contentite0_ 内连接 Orchard_Framework_ContentItemRecord contentite1_ on contentite0_.ContentItemRecord_id=contentite1_.Id 内连接 Customer_ProductPartRecord productpar2_ on contentite1_.Id=productpar2_.Id where contentite0_.Published=1 order by contentite0_.Id]

**ProductPartFilter.cs**

using Orchard.Localization;
using Orchard.Projections;
using Orchard.Projections.Descriptors.Filter;
using Skywalker.Webshop.Models;
using IFilterProvider = Orchard.Projections.Services.IFilterProvider;

namespace Skywalker.Webshop.Filters
{
public class ProductPartFilter : IFilterProvider
{
    public Localizer T { get; set; }

    public ProductPartFilter()
    {
        T = NullLocalizer.Instance;
    }

    public void Describe(DescribeFilterContext describe)
    {
        describe.For(
            "Content",          // The category of this filter
            T("Content"),       // The name of the filter (not used in 1.4)
            T("Content"))       // The description of the filter (not used in 1.4)

            // Defines the actual filter (we could define multiple filters using the  fluent syntax)
            .Element(
                "ProductParts",     // Type of the element
                T("Product Parts"), // Name of the element
                T("Product parts"), // Description of the element
                ApplyFilter,        // Delegate to a method that performs the actual  filtering for this element
                DisplayFilter       // Delegate to a method that returns a descriptive  string for this element
            );
    }

    private void ApplyFilter(FilterContext context)
    {

        // Set the Query property of the context parameter to any IHqlQuery. In our    case, we use a default query
        // and narrow it down by joining with the ProductPartRecord.
        context.Query = context.Query.Join(x =>     x.ContentPartRecord(typeof(ProductPartRecord)));
    }

    private LocalizedString DisplayFilter(FilterContext context)
    {
        return T("Content with ProductPart");
    }
  }
 }