MongoDB 查询：过滤和排除字段答案

【问题标题】：MongoDB query: filter and exclude fieldsMongoDB 查询：过滤和排除字段
【发布时间】：2018-05-11 15:48:19
【问题描述】：

我有以下数据结构：

{
"groups" : [ 
    {
        "internalName" : "Group1",
        "fields" : [ 
            {
                "internalName" : "Field1",
                "uiProperties" : {
                    "isShow" : true
                }
            }, 
            {
                "internalName" : "Field2",
                "uiProperties" : {
                    "isHide" : false
                }
            }
        ]
    }, 
    {
        "internalName" : "Group2",
        "fields" : [ 
            {
                "internalName" : "Field1",
                "uiProperties" : {
                    "IsHide" : false
                }
            }
        ]
    }
],
"internalName" : "Layout1"
},
{
"groups" : [ 
    {
        "internalName" : "Group3",
        "fields" : [ 
            {
                "internalName" : "Field2",
                "uiProperties" : {
                    "isShow" : true
                }
            }, 
            {
                "internalName" : "Field4",
                "uiProperties" : {
                    "isHide" : false
                }
            }
        ]
    }, 
    {
        "internalName" : "Group4",
        "fields" : [ 
            {
                "internalName" : "Field3",
                "uiProperties" : {
                    "IsHide" : false
                }
            }
        ]
    }
],
"internalName" : "Layout2"
}

目标是按字段内部名称过滤此数据并仅返回所需数据 - 仅返回仅包含具有选定内部名称的字段的组。例如上面的数据：过滤的内部名称 - “Field2”、“Field4” 预期返回的数据：

{
"internalName" : "Layout1",
"groups" : [ 
    {
        "internalName" : "Group1",
        "fields" : [  
            {
                "internalName" : "Field2",
                "uiProperties" : {
                    "isHide" : false
                }
            }
        ]
    }
]
},
{
"internalName" : "Layout2",
"groups" : [ 
    {
        "internalName" : "Group3",
        "fields" : [ 
            {
                "internalName" : "Field4",
                "uiProperties" : {
                    "isHide" : false
                }
            }
        ]
    }
]
}

我正在尝试类似的东西

{
        $match: {  
            "groups.fields.internalName": {
                $in: ["Field2", "Field4"]
            }
        }
   },
   {
        $unwind: "$groups"
   },
   {  
        $unwind: "$groups.fields"
   },
   {  
        $group: {  
            _id:"$_id",
            internalName: {
                 $first: "$internalName",
            },    
            groups:{  
                 $push: {
                      internalName: "$groups.internalName",
                      fields: "$groups.fields"
                 }   
            }
        }
    }

但是效果不好.. 你能帮我吗？

【问题讨论】：

标签： mongodb mongodb-query aggregation-framework mongodb-java mongodb-java-3.3.0

【解决方案1】：

您的聚合管道中有错误。首先展开组元素，然后展开字段元素

{
  {$unwind: "$groups"},
  {$unwind: "$groups.fields"},
  {$match: {"groups.fields.internalName", {$eq: {$or: ["Field2", "Field4",...]}}}},

}

稍后按照您的方式对其进行分组。

【讨论】：