Getting a list of unique embedded/nested objects in a MongoDB document

Question

Consider the following MongoDB \"recipes\" collection:

{
  \"title\" : \"Macaroni and Cheese\",
  \"ingredients\" : [
    { \"name\" : \"noodles\", \"qty\" :         


        

Answer 1

Use distinct to find an array of distinct values for ingredients.name

db.recipes.distinct('ingredients.name')

yields [ "butter", "cheese", "noodles", "flour", "sugar", "water" ]