My documents in the orders collection has _client key, which is an ObjectId references to another entity in another collection. The collection could be organization and could be users - I mean - it's variable collection. I want to tell Mongo to l...

I have two collection  Collection_foo :  {     cid:'1234',     'foo':'bar',     some 10+ fields... }   Collection_bar :  {     cid:'1234',     'foobar':'barfoo',     some 10+ fields... }   I want to joi...

I have some problem with aggregate, I have one collection.I have collection like code below. so on I have one field call dueDate compare with current Date 2018-11-16. I need sum remaining value by compare that current date with dueDate totalfirstAmou...

I'm struggling to find out how to add a new status field in an aggregate based on a calculation of an array of items.  Currently, I do this in Angular front-end by asking both collections and iterating each element with the _.some() method of Lod...

I'm using node-mongodb-native to implement MongoDB query functions. I need to perform a query if tag matches a part or combined firstName and lastName like this:  filter50WithTagSkip(tag, skip) {         return new Promise((resolve, reject) =>...

In my project I would like to calculate monthly precipitation and temperature averages (min/max) for the whole year, similarly to this chart or average views in this app (which is using Forecast.io data).  I have stumbled quite early, however, as I a...

I have to create a tree structured table with some data given in the form of json array.  let us take an example array  array : [ { "continent": "Asia", "country":"India", "population": 100, "GDP":4}, {...

I want to display a collection with Angular2 with *ngFor.   I tried something like *ngFor ="let x in data" {{x._id.category}} but it didn't work.     How can I display this object or is there a way to do it with mongoose?  gquery= [{...

I want to extract the min and max values from all of the properties of the collection:  "data": [     {         "food": 41000,         "drinks": 60,         "toys": 18961,         "candy": 8740     },     {...

Seen below is a time series bar graph with a range selector in plotly.js.  In it, I am trying to figure out how to group the values by week, but cannot seem to accomplish this. Is there a setting in plotly.js to group these by week when changing the...