So I'm trying to make a favourites page in my android mobile application. The products are in their own top-level collection and structured as:
{
"Trainers": {
"trainer1": {
"brand": "Nike",
"name": "Air Force 1",
"colour": "Black"
"url": ".................." //FOR IMAGES
},
"trainer2": {
"brand": "Adidas",
"name": "Yeezy Boost 700",
"colour": "Black"
"url": ".................."
},
"trainer3": {
"brand": "Nike",
"name": "Air Spiridons",
"colour": "Cream"
"url": ".................."
}
}
}
I was then going to have another top-level collection that contains documents named as a users id, followed by an array of their favourite trainers 'name'. However, in order to populate the favourites page, I would then need to search the 'Trainer' collection for each shoe in a users favourites document.
So going back to my question, if User1 has liked 'Air Force 1 & Yeezy Boost 700' (or maybe more products than this) is it possible to query a collection where the documents 'name' field equals multiple values or is there a better way to structure a favourites activity?
is it possible to query a collection where the documents 'name' field equals multiple values or is there a better way to structure a favourites activity?
Sure it is, using an array that can contain max 10 values. According to the docs:
Similarly, use the array-contains-any operator to combine up to 10 array-contains clauses on the same field with a logical
OR.
So in your case, you should use the following query:
usersRef.whereArrayContainsAny("name", Arrays.asList("Air Force 1", "Yeezy Boost 700"));