MongoDB: Querying
#################

Simple query example:
=====================

.. code:: json

     {
         "collection" : "my_collection",
         "query" : {
             "date" : {
                 "$gt" : "ISODate(\"2015-01-15 11:41\")",
             },
             "type" : 1
         },
         "fields" : {
             "_id" : 1,
             "name" : 2
         },
         "sort" : [
            {
                 "name" : "date",
                 "direction" : -1
            }
         ]
     }

Live example on the demo instance:
http://demo.redash.io/queries/394/source.

Aggregation
===========

Uses a syntax similar to the one used in PyMongo, however to support the
correct order of sorting, it uses a regular list for the "$sort"
operation that converts into a SON (sorted dictionary) object before
execution.

Aggregation query example:

.. code:: json

     {
         "collection" : "things",
         "aggregate" : [
             {
                 "$unwind" : "$tags"
             },
             {
                 "$group" : {
                     "_id" : "$tags",
                     "count" : { "$sum" : 1 }
                 }
             },
             {
                 "$sort" : [
                     {
                         "name" : "count",
                         "direction" : -1
                     },
                     {
                         "name" : "_id",
                         "direction" : -1
                     }
                 ]
             }
         ]
     }

Live examples on the demo instance:

1. http://demo.redash.io/queries/393/source
2. http://demo.redash.io/queries/387/source

MongoDB Extended JSON Support
=============================

We support `MongoDB Extended JSON <https://docs.mongodb.com/manual/reference/mongodb-extended-json/>`__ along with our own extension - ``$humanTime``:

.. code:: json

     {
         "collection": "date_test",
         "query": {
             "lastModified": {
                 "$gt": {
                     "$humanTime": "3 years ago"
                 }
             }
         },
         "limit": 100
     }

It accepts human readable string like the above ("3 years ago", "yesterday", etc) or timestamps.

Live example on the demo instance: http://demo.redash.io/queries/2112/source.