All queries must follow following syntax { "_operation" : operation, "_operation_args" : operation_args }

Following Operations are supported :

find

{
	"_operation" : "find" ,
	"_operation_args" : {
							"query" : { 'patientId' : 'x' } ,
							"fields" :{ '_id' : 0 },
							"skip" : 3,
							"limit" : 1000,
							"sort" : { 'age' : -1 }
						}
}

count

{
	"_operation" : "count" ,
	"_operation_args" : {
							"query" : { 'patientId' : 'x' }
						}
}

distinct

{
	"_operation" : "distinct" ,
	"_operation_args" : {
							"field" : "location",
							"query" : {'age': {$gt: 50}}
						}
}

group

{
	"_operation" : "group" ,
	"_operation_args" : {
							"key" : {  }  ,
							"condition" : { }  ,
							"initial" : { }  ,
							"reduce" :  'function(){}' ,
							"finalize" :  'function(){}'  
						}
}

mapreduce

{
	"_operation" : "mapreduce" ,
	"_operation_args" : {
							"query" : {  } ,
							"map" : "function(){}" , 
							"reduce" : "function(){}" , 
							"outputCollection" : "outputcollection"    
						}
}

aggregate

{
	"_operation" : "aggregate" ,
	"_operation_args" : {
							"match" : { patientId: 'x' }  ,
							"group" : { _id: "$age", total: { $sum: "$bill" } } ,
							"sort" :  { total: -1 }
						}
}