Mongo查询显示工作日字段

Question

我试图弄清楚如何将工作日的名称添加到显示的字段中？到目前为止，它仍然有效，但是仅显示“ Count”和“ Completed At”字段。

它应该显示以下内容：

| Weekday | Count |
–––––––––––––––––––
| Monday  |   1   |
| Tuesday |   10  |
| Wedne.. |  ...  |

这是我的查询：

 [
      {
        "$project": {
          "completedAt": "$completedAt",
          "status": "$status"
        }
      },
      {
        "$match": {
          "$and": [
            {
              "status": {
                "$eq": "successful"
              }
            },
            {
              "completedAt": {
                "$gt": ISODate("2019-01-01")
              }
            }
          ]
        }
      },
      {
        "$project": {
          "_id": "$_id",
          "___group": {
            "completedAt": {
              "$dayOfWeek": "$completedAt"
            }
          }
        }
      },
      {
        "$group": {
          "_id": "$___group",
          "count": {
            "$sum": 1
          }
        }
      },
      {
        "$sort": {
          "_id": 1
        }
      },
      {
        "$project": {
          "_id": false,
          "completedAt": "$_id.completedAt",
          "count": true
        }
      },
      {
        "$sort": {
          "completedAt": 1
        }
      }
    ]

Answer 1

在查询中添加包括$ switch的标签为我解决了该问题。

[
  {
    "$project": {
      "completedAt": "$completedAt",
      "status": "$status"
    }
  },
  {
    "$match": {
      "$and": [
        {
          "status": {
            "$eq": "successful"
          }
        },
        {
          "completedAt": {
            "$gt": ISODate("2019-01-01")
          }
        }
      ]
    }
  },
  {
    "$project": {
      "_id": "$_id",
      "___group": {
        "completedAt": {
          "$dayOfWeek": "$completedAt"
        }
      }
    }
  },
  {
    "$group": {
      "_id": "$___group",
      "count": {
        "$sum": 1
      }
    }
  },
  {
    "$sort": {
      "_id": 1
    }
  },
  {
    "$project": {
      "_id": false,
      "count": true,
      "label": {
        "$switch": {
          "branches": [
            {
              "case": { "$eq": ["$_id.completedAt", 1] },
              "then": "Sunday"
            },
            {
              "case": { "$eq": ["$_id.completedAt", 2] },
              "then": "Monday"
            },
            {
              "case": { "$eq": ["$_id.completedAt", 3] },
              "then": "Tuesday"
            },
            {
              "case": { "$eq": ["$_id.completedAt", 4] },
              "then": "Wednesday"
            },
            {
              "case": { "$eq": ["$_id.completedAt", 5] },
              "then": "Thursday"
            },
            {
              "case": { "$eq": ["$_id.completedAt", 6] },
              "then": "Friday"
            },
            {
              "case": { "$eq": ["$_id.completedAt", 7] },
              "then": "Saturday"
            }
          ],
          "default": "Unknown"
        }
      }
    }
  },
  {
    "$sort": {
      "completedAt": 1
    }
  }
]