RavenDb静态索引:查询子集合对象

Question

我有一个类似如下的文档结构:

Employer => Positions => RequiredSkills

雇主有一个职位
定位集合有一个RequiredSkill集合.
所需技能包括技能(字符串)和熟练程度(枚举).

如果我使用动态索引,它似乎返回公司,但我想使用索引来填充MVC视图模型以返回到UI.

我是Raven的新手,所以我为做任何愚蠢/不必要的事而道歉!

我有以下映射:

public class PositionSearch : AbstractIndexCreationTask<Employer>
    {
        public PositionSearch()
        {
            Map = employers =>
                  from employer in employers
                  from position in employer.Positions
                  select new
                      {
                          EmployerId = employer.Id,
                          EmployerName = employer.Name,
                          PositionId = position.Id,
                          PositionTitle = position.Title,
                          position.Location,
                          position.Description,
                          RequiredSkills = position.RequiredSkills
                      };

            StoreAllFields(FieldStorage.Yes);

            Index("RequiredSkills_Skill", FieldIndexing.Analyzed);
        }
    }

但是当我尝试执行以下查询时:

var results = session.Query<PositionSearchResultModel, PositionSearch>()
    .Customize(x => x.WaitForNonStaleResults())
    .Where(x=>x.RequiredSkills.Any(y=>y.Skill == "SkillName"))
    .ProjectFromIndexFieldsInto<PositionSearchResultModel>()
    .ToList();

我收到以下错误:

System.ArgumentException:
    The field 'RequiredSkills_Skill' is not indexed,
    cannot query on fields that are not indexed

任何人都可以看到我做错了或为我建议另一种方法吗？

谢谢,

詹姆士

更新我的视图模型 - 谢谢:

public class PositionSearchResultModel
{
    public PositionSearchResultModel()
    {
        RequiredSkills = new HashSet<SkillProficiency>();
    }

    public string EmployerId { get; set; }
    public string EmployerName { get; set; }
    public string PositionId { get; set; }
    public string PositionTitle { get; set; }
    public string Location { get; set; }
    public string Description { get; set; }
    public ICollection<SkillProficiency> RequiredSkills { get; set; }
 }

Answer 1

因为您希望根据技能名称进行分析搜索,所以需要将其隔离为单独的索引条目.

public class PositionSearch
    : AbstractIndexCreationTask<Employer, PositionSearchResultModel>
{
    public PositionSearch()
    {
        Map = employers =>
                from employer in employers
                from position in employer.Positions
                select new
                {
                    EmployerId = employer.Id,
                    EmployerName = employer.Name,
                    PositionId = position.Id,
                    PositionTitle = position.Title,
                    position.Location,
                    position.Description,
                    position.RequiredSkills,

                    // Isolate the search property into it's own value
                    SkillsSearch = position.RequiredSkills.Select(x => x.Skill)
                };

        // you could store all fields if you wanted, but the search field
        // doesn't need to be stored so that would be wasteful.
        Store(x => x.PositionId, FieldStorage.Yes);
        Store(x => x.PositionTitle, FieldStorage.Yes);
        Store(x => x.Location, FieldStorage.Yes);
        Store(x => x.Description, FieldStorage.Yes);
        Store(x => x.RequiredSkills, FieldStorage.Yes);

        // Any field you are going to use .Search() on should be analyzed.
        Index(x => x.SkillsSearch, FieldIndexing.Analyzed);
    }
}

请注意,我将投影指定为索引的结果.这是语法糖.将其关闭并没有错,但是你必须使用字符串指定搜索字段.

您还需要将搜索字段添加到结果类中

public string[] SkillsSearch { get; set; }

它究竟是什么类型并不重要.字符串数组或集合就可以了.您也可以只使用字符串或对象,因为它只是相关的名称.

查询此索引时,请使用此.Search()方法,如下所示:

var results = session.Query<PositionSearchResultModel, PositionSearch>()
    .Customize(x => x.WaitForNonStaleResults())  // only use this in testing
    .Search(x=> x.SkillsSearch, "SkillName")
    .ProjectFromIndexFieldsInto<PositionSearchResultModel>()  // AsProjection would also work
    .ToList();

请注意,您必须存储这么多字段的唯一原因是因为您想要投影它们.如果将位置分隔为自己的文档,则会有更小的索引,而且项目的编制要少得多.请记住,在投影时,原始文档中的所有字段都已存在,并且直接来自文档存储,而不必复制到索引中.因此,如果您的原始文档更符合您期望的结果,那么可以做的工作就更少了.