Question

好的，我正在使用Couchbase 2.0和最新的.NET客户端。基本上我写的是一个跟踪目标的项目（一个美化的待办事项清单）......

我已经设法将目标对象存储为couchbase中的JSON文档，然后将其反序列化为POCO，但我的问题是如何自动查找链接的文档并填充子目标列表＆lt;目标＆gt;

不确定这种自动反序列化是否可行，如果没有一些逻辑可以在代码本身内处理它，但任何指针都很受欢迎，欢呼！

JSON

{
    id: "goal_1",
    name: "goal 1",
    description: "think of some better projects",
    subGoals: [goal_2, goal_3]
}

C＃

var goal = client.GetJson<Goal>(id);
return goal;

这是POCO

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Newtonsoft.Json;

namespace stuff.Models
{
    public class Goal
    {
        protected DateTime _targetDate;

        /// <summary>
        /// Name of the goal
        /// </summary>
        [JsonProperty("name")]
        public String Name { get; set; }

        /// <summary>
        /// Full description of the goal
        /// </summary>
        [JsonProperty("description")]
        public String Description { get; set; }

        /// <summary>
        /// Target date for completing this goal
        /// </summary>
        [JsonProperty("targetDate")]
        public DateTime? TargetDate
        {
            get
            {
                return _targetDate;
            }
            set
            {
                // target date must be later than any sub-goal target dates
            }
        }

        /// <summary>
        /// Any sub-goals
        /// </summary>
        [JsonProperty("subGoals")]
        public List<Goal> SubGoals { get; set; }

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="Name"></param>
        /// <param name="Description"></param>
        /// <param name="TargetDate"></param>
        /// <param name="SubGoals"></param>
        public Goal(String Name, String Description, DateTime? TargetDate = null, List<Goal> SubGoals = null)
        {
            this.Name = Name;
            this.Description = Description;
            this.TargetDate = TargetDate;
            this.SubGoals = SubGoals;
        }
    }
}

Answer 1

在一个“join”查询中没有自动获取相关文档的方法，但您可以使用整理视图。所以给出了一组如下目标（注意添加了一个类型属性）：

{"name":"goal 1","description":"This is a parent goal","subgoals":["goal2","goal3"],"type":"goal"}
{"name":"goal 2","description":"This is a child goal","type":"goal"}
{"name":"goal 3","description":"This is another child goal","type":"goal"}
{"name":"goal 4","description":"This is another parent goal","subgoals":["goal5","goal6","goal7"],"type":"goal"}
{"name":"goal 5","description":"This is a child goal","type":"goal"}
{"name":"goal 6","description":"This is a child goal","type":"goal"}
{"name":"goal 7","description":"This is a child goal","type":"goal"}

然后，您将编写一个视图，输出每个父目标，后跟其子项：

function (doc, meta) 
{
  if (doc.type == "goal" && doc.subgoals)
  {
    emit([meta.id, 0], null);
        for(var idx in doc.subgoals)
        {
          emit([doc.subgoals[idx], 1], null);
        }    
  }
}

此视图的输出是一组行，其中每行包含一个由父ID和0组成的键，后跟其子项和1（0和1确保行正确排序）：

{"id":"goal1","key":["goal1",0],"value":null},
{"id":"goal1","key":["goal2",1],"value":null},
{"id":"goal1","key":["goal3",1],"value":null},
{"id":"goal4","key":["goal4",0],"value":null},
{"id":"goal4","key":["goal5",1],"value":null},
{"id":"goal4","key":["goal6",1],"value":null}

在.NET SDK教程中，我将介绍如何查询整理视图（Brewery及其啤酒）。

http://www.couchbase.com/docs/couchbase-sdk-net-1.2/collatedviews.html

Couchbase：如何自动反序列化链接的文档

1 个答案: