Question

This is probably a noobish question, however I have spent quite some time on it now.

So this is my structure, highly minimized:

{
  name : 'Some dude', 
  deck : [{
    name : 'Awesome card',
    value : 30
  },
  {
    name : 'another awesome card',
    value: 50
  }]
}

I want to select from all cards in the deck, where name == ‘Awesome card’, returning this

{
  name : 'Some dude', 
  deck : [{
    name : 'Awesome card',
    value : 30
  }]
}

been trying loads of commands like

db.heroes.find({name : “Some dude”}, {‘deck’ : 1, ‘deck.name’ : ‘Awesome card})

How should I query this?

Answer 1

You can use the $ position operator which identifies the index of the matched deck array element in your field selection:

db.heroes.find(
    {name : "Some dude", 'deck.name' : 'Awesome card'}, 
    {_id: 0, name: 1, 'deck.$.name': 1}
);