mongodb - 将字符串日期转换为 MongoDB 中的日期

Question

我有一个集合，其中 resolve_at 字段以字符串格式存储，如下所示:

{"resolved_at": 2020-05-23 05:57:40}

现在我想使用以下查询将其转换为格式为 "%Y-%m-%d" 的日期类型:

db.tickets.aggregate([{"$match":{"botExecResult": "BotSuccess",
    "$and":[{"resolved_at":{"$type":"string","$ne":""}}],
    }},
   { 
   $project: {
      date: {
         $dateFromString: {
            dateString: '$resolved_at',
            format: "%Y-%m-%d"
         
            
         }}}},      
  ])

执行此操作时，我不断收到此错误:

 Error: command failed: {
    "ok" : 0,
    "errmsg" : "Error parsing date string '2020-03-17 23:03:29'; 10: Trailing data ' '",
    "code" : 241,
    "codeName" : "ConversionFailure"
} : aggregate failed 
Details:
_getErrorWithCode@src/mongo/shell/utils.js:25:13
doassert@src/mongo/shell/assert.js:18:14
_assertCommandWorked@src/mongo/shell/assert.js:534:17
assert.commandWorked@src/mongo/shell/assert.js:618:16
DB.prototype._runAggregate@src/mongo/shell/db.js:260:9
DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1062:12
DBCollection.prototype.aggregate@:1:355
@(shell):1:1

查询结构有问题吗？

Answer 1

以下查询对我有用:

db.tickets.aggregate([{"$match":{"botExecResult": "BotSuccess",
    "$and":[{"resolved_at":{"$type":"string","$ne":""}}],
    }},
   { 
   $project: {
      date: {
         $dateToString:{
             format: '%Y-%m-%d',
             date: {$dateFromString: {dateString: '$resolved_at'}}
      }
  }
   }
   },

   {
       "$match": {"date":{'$lt': "2020-08-05", '$gte': "2020-04-21"}}
   }
  
       
  ])