Können wir nur die Zeit in Mongodb vergleichen?

Question

Ich habe happyHours von Hotels in Datum Uhrzeit Format gespeichert. Jetzt möchte ich alle Hotels holen, deren Happy Hours größer sind als die aktuelle Zeit.

Nach meinem Wissen weiß ich, dass es einen Datumsvergleich mit Abrufergebnis gibt, aber dies wird das ganze Datum Zeitobjekt vergleichen.

Gibt es eine Möglichkeit, nur die Zeit zu vergleichen?

Happyhours Datum Objektprobe in db:

"happyHours" : { 
    "mon" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ], 
    "tue" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ], 
    "wed" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ], 
    "thu" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ], 
    "fri" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ], 
    "sat" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ], 
    "sun" : [ 
     { 
      "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
      "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
     } 
    ] 
} 

Answer 1

mit zu starten, das aktuelle Schema für die Abfrage nicht förderlich ist; die Arrays sind wirklich nicht notwendig, in diesem Fall, wenn Sie die Wochentage als Schlüssel zu halten waren dann der bessere Ansatz, die Arrays zu verlieren wäre und verweisen nur das Element:

"happyHours": { 
    "mon": { 
     "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
     "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
    }, 
    ... 
    "sun": { 
     "startTime" : ISODate("2016-04-11T06:30:59.000Z"), 
     "endTime" : ISODate("2016-04-11T14:30:59.000Z") 
    }  
} 

---

jedoch eine viel bessere Design, das das Abfragen viel einfacher macht, winkt. Sie könnten das happyHours Feld in ein Array umwandeln, die ein Dokument hält, die den Wochentag beschreibt, Stunde beginnen, starten Minuten, Ende Stunden und Minuten jeweils wie folgt:

"happyHours": [ 
    { 
     "weekDay": "mon", 
     "startHour": 6, 
     "startMinutes": 30, 
     "endHour": 14 
     "endMinutes": 30 
    } 
    ... 
] 

dann wäre die Abfrage wie folgt:

var now = new Date(), 
    days = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sun'], 
    weekDay = days[now.getDay()], 
    hour = now.getHours(), 
    minutes = now.getMinutes(); 

db.hotels.find({ 
    "happyHours.weekDay": weekDay, 
    "happyHours.startHour": { "$lte": hour }, 
    "happyHours.startMinutes": { "$lte": minutes }, 
    "happyHours.endHour": { "$gte": hour }, 
    "happyHours.endMinutes": { "$gte": minutes } 
}) 

Wenn Sie jetzt nicht über die Möglichkeit verfügen, Ihr Schema so zu ändern, dass es den obigen Empfehlungen entspricht, bietet das Aggregationsframework eine Umgehungslösung. Betrachten Sie die folgende Aggregation Pipeline, die Verwendung des date aggregation operators im $project Schritt und Abfrage in der nachfolgenden $match Pipeline macht:

var now = new Date(), 
    days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sun'], 
    weekDay = days[now.getDay()], 
    hour = now.getHours(), 
    minutes = now.getMinutes(); 
    project = { 
    "$project": { 
     "otherfields": 1, 
     "happyHours": 1, 
     "happyHoursMonStartHour": { "$hour": "$happyHours.mon.startTime" }, 
     "happyHoursMonStartMinutes": { "$minute": "$happyHours.mon.startTime" }, 
     "happyHoursMonEndHour": { "$hour": "$happyHours.mon.endTime" }, 
     "happyHoursMonEndMinutes": { "$minute": "$happyHours.mon.endTime" }, 
     "happyHoursTueStartHour": { "$hour": "$happyHours.tue.startTime" }, 
     "happyHoursTueStartMinutes": { "$minute": "$happyHours.tue.startTime" }, 
     "happyHoursTueEndHour": { "$hour": "$happyHours.tue.endTime" }, 
     "happyHoursTueEndMinutes": { "$minute": "$happyHours.tue.endTime" }, 
     "happyHoursWedStartHour": { "$hour": "$happyHours.wed.startTime" }, 
     "happyHoursWedStartMinutes": { "$minute": "$happyHours.wed.startTime" }, 
     "happyHoursWedEndHour": { "$hour": "$happyHours.wed.endTime" }, 
     "happyHoursWedEndMinutes": { "$minute": "$happyHours.wed.endTime" }, 
     "happyHoursThuStartHour": { "$hour": "$happyHours.thu.startTime" }, 
     "happyHoursThuStartMinutes": { "$minute": "$happyHours.thur.startTime" }, 
     "happyHoursThuEndHour": { "$hour": "$happyHours.thu.endTime" }, 
     "happyHoursThuEndMinutes": { "$minute": "$happyHours.thu.endTime" }, 
     "happyHoursFriStartHour": { "$hour": "$happyHours.fri.startTime" }, 
     "happyHoursFriStartMinutes": { "$minute": "$happyHours.fri.startTime" }, 
     "happyHoursFriEndHour": { "$hour": "$happyHours.fri.endTime" }, 
     "happyHoursFriEndMinutes": { "$minute": "$happyHours.fri.endTime" }, 
     "happyHoursSatStartHour": { "$hour": "$happyHours.sat.startTime" }, 
     "happyHoursSatStartMinutes": { "$minute": "$happyHours.sat.startTime" }, 
     "happyHoursSatEndHour": { "$hour": "$happyHours.sat.endTime" }, 
     "happyHoursSatEndMinutes": { "$minute": "$happyHours.sat.endTime" }, 
     "happyHoursSunStartHour": { "$hour": "$happyHours.sun.startTime" }, 
     "happyHoursSunStartMinutes": { "$minute": "$happyHours.sun.startTime" }, 
     "happyHoursSunEndHour": { "$hour": "$happyHours.sun.endTime" }, 
     "happyHoursSunEndMinutes": { "$minute": "$happyHours.sun.endTime" }, 
    } 
    }, 
    match = { "$match": {} },  
    pipeline = [ 
    { "$unwind": "$happyHours.mon" }, 
    { "$unwind": "$happyHours.tue" }, 
    { "$unwind": "$happyHours.wed" }, 
    { "$unwind": "$happyHours.thur" }, 
    { "$unwind": "$happyHours.fri" }, 
    { "$unwind": "$happyHours.sat" }, 
    { "$unwind": "$happyHours.sun" }  
    ]; 

match["$match"]["happyHours"+ weekDay +"StartHour"] = { "$lte": hour }; 
match["$match"]["happyHours"+ weekDay +"StartMinutes"] = { "$lte": minutes }; 
match["$match"]["happyHours"+ weekDay +"EndHour"] = { "$gte": minutes }; 
match["$match"]["happyHours"+ weekDay +"EndMinutes"] = { "$gte": minutes }; 
pipeline.push(project); 
pipeline.push(match); 

db.hotels.aggregate(pipeline); 

---

die Pipeline Drucken, bevor es mit printjson(pipeline) laufen würden Sie dies zeigen:

[ 
    { 
     "$unwind" : "$happyHours.mon" 
    }, 
    { 
     "$unwind" : "$happyHours.tue" 
    }, 
    { 
     "$unwind" : "$happyHours.wed" 
    }, 
    { 
     "$unwind" : "$happyHours.thur" 
    }, 
    { 
     "$unwind" : "$happyHours.fri" 
    }, 
    { 
     "$unwind" : "$happyHours.sat" 
    }, 
    { 
     "$unwind" : "$happyHours.sun" 
    }, 
    { 
     "$project" : { 
      "otherfields" : 1, 
      "happyHours" : 1, 
      "happyHoursMonStartHour" : { 
       "$hour" : "$happyHours.mon.startTime" 
      }, 
      "happyHoursMonStartMinutes" : { 
       "$minute" : "$happyHours.mon.startTime" 
      }, 
      "happyHoursMonEndHour" : { 
       "$hour" : "$happyHours.mon.endTime" 
      }, 
      "happyHoursMonEndMinutes" : { 
       "$minute" : "$happyHours.mon.endTime" 
      }, 
      "happyHoursTueStartHour" : { 
       "$hour" : "$happyHours.tue.startTime" 
      }, 
      "happyHoursTueStartMinutes" : { 
       "$minute" : "$happyHours.tue.startTime" 
      }, 
      "happyHoursTueEndHour" : { 
       "$hour" : "$happyHours.tue.endTime" 
      }, 
      "happyHoursTueEndMinutes" : { 
       "$minute" : "$happyHours.tue.endTime" 
      }, 
      "happyHoursWedStartHour" : { 
       "$hour" : "$happyHours.wed.startTime" 
      }, 
      "happyHoursWedStartMinutes" : { 
       "$minute" : "$happyHours.wed.startTime" 
      }, 
      "happyHoursWedEndHour" : { 
       "$hour" : "$happyHours.wed.endTime" 
      }, 
      "happyHoursWedEndMinutes" : { 
       "$minute" : "$happyHours.wed.endTime" 
      }, 
      "happyHoursThuStartHour" : { 
       "$hour" : "$happyHours.thu.startTime" 
      }, 
      "happyHoursThuStartMinutes" : { 
       "$minute" : "$happyHours.thur.startTime" 
      }, 
      "happyHoursThuEndHour" : { 
       "$hour" : "$happyHours.thu.endTime" 
      }, 
      "happyHoursThuEndMinutes" : { 
       "$minute" : "$happyHours.thu.endTime" 
      }, 
      "happyHoursFriStartHour" : { 
       "$hour" : "$happyHours.fri.startTime" 
      }, 
      "happyHoursFriStartMinutes" : { 
       "$minute" : "$happyHours.fri.startTime" 
      }, 
      "happyHoursFriEndHour" : { 
       "$hour" : "$happyHours.fri.endTime" 
      }, 
      "happyHoursFriEndMinutes" : { 
       "$minute" : "$happyHours.fri.endTime" 
      }, 
      "happyHoursSatStartHour" : { 
       "$hour" : "$happyHours.sat.startTime" 
      }, 
      "happyHoursSatStartMinutes" : { 
       "$minute" : "$happyHours.sat.startTime" 
      }, 
      "happyHoursSatEndHour" : { 
       "$hour" : "$happyHours.sat.endTime" 
      }, 
      "happyHoursSatEndMinutes" : { 
       "$minute" : "$happyHours.sat.endTime" 
      }, 
      "happyHoursSunStartHour" : { 
       "$hour" : "$happyHours.sun.startTime" 
      }, 
      "happyHoursSunStartMinutes" : { 
       "$minute" : "$happyHours.sun.startTime" 
      }, 
      "happyHoursSunEndHour" : { 
       "$hour" : "$happyHours.sun.endTime" 
      }, 
      "happyHoursSunEndMinutes" : { 
       "$minute" : "$happyHours.sun.endTime" 
      } 
     } 
    }, 
    { 
     "$match" : { 
      "happyHoursThuStartHour" : { 
       "$lte" : 9 
      }, 
      "happyHoursThuStartMinutes" : { 
       "$lte" : 34 
      }, 
      "happyHoursThuEndHour" : { 
       "$gte" : 34 
      }, 
      "happyHoursThuEndMinutes" : { 
       "$gte" : 34 
      } 
     } 
    } 
]