String Sort by Custom sort in MongoDB?

Working with Data
,
1

String Sort by Custom sort in MongoDB?

{	
	"_id" : "1",
	"name" : "Kathir",
	"age" : "28",
	"priority" : null
},
{	
	"_id" : "12",
	"name" : "Raja",
	"age" : "32",
	"priority" : "high"
},
{	
	"_id" : "34",
	"name" : "Sarath",
	"age" : "24",
	"priority" : "medium"
},
{	
	"_id" : "08",
	"name" : "Chandru",
	"age" : "24",
	"priority" : "low"
},

how to sort this data in mongo sorting by priority as [“high”, “medium”, “low”, null] - i need this order,
please help me friends !..

2

Hi @Kathiresan_S ,

You can use a switch case statement to have sortable values based on your logic:

db.collection.aggregate([{
 $addFields: {
  sortPriority: {
   $switch: {
    branches: [
     {
      'case': {
       $eq: [
        '$priority',
        'high'
       ]
      },
      then: 3
     },
     {
      'case': {
       $eq: [
        '$priority',
        'medium'
       ]
      },
      then: 2
     },
     {
      'case': {
       $eq: [
        '$priority',
        'low'
       ]
      },
      then: 1
     }
    ],
    'default': 0
   }
  }
 }
}, {
 $sort: {
  sortPriority: -1
 }
}])

This will sort as the result would be:

{ _id: '12',
  name: 'Raja',
  age: '32',
  priority: 'high',
  sortPriority: 3 }
{ _id: '34',
  name: 'Sarath',
  age: '24',
  priority: 'medium',
  sortPriority: 2 }
{ _id: '08',
  name: 'Chandru',
  age: '24',
  priority: 'low',
  sortPriority: 1 }
{ _id: '1',
  name: 'Kathir',
  age: '28',
  priority: null,
  sortPriority: 0 }

Thanks
Pavel

1 Like
3

thanks a lot @Pavel_Duchovny