MongoDB query on objects in an array based on condition - mongodb

Question

I have a players inventory that looks like this.
let inventory = [ { name: 'Wood', amount: 6 }, { name: 'Stone', amount: 2 } ]
This is the players resources.
I also have a list of craftable items.
{"name":"CraftingTable","craftingReagents":[{"name":"Stone","amount":"2"}]}
{"name":"CraftingTable2","craftingReagents":[{"name":"Wood","amount":"4"}]}
{"name":"CraftingTable3","craftingReagents":[{"name":"Wood","amount":"5"},{"name":"Stone","amount":"2"}]}
The items schema is as such
let itemSchema = new mongoose.Schema(
{
name:String,
craftingReagents: [
{
name: String,
amount: Number
}
]
}
);
I want a query that will return all craftable objects where the players inventory has sufficient resources to do so.
For example with 6 Wood and 2 Stone the query should return all 3 crafting tables, as the player has sufficient resources to craft all three
This is what I have so far, and I am very lost. Please help!
itemModel.find({
craftingReagents: {
$all: [{
$elemMatch: {
name: {
$in: [
'Wood'
]
},
amount: { $lte: 6 }
}
},
{
$elemMatch: {
name: {
$in: [
'Stone'
]
},
amount: { $lte: 2 }
}
}
]
}
});
Heres the thing. The players inventory can change to an infinite number of different resources. AND the craftable objects can have an infinite number of different requirments. I meerly gave an example of what the inventory, and craftable objects could look like.
How do you list documents that the player has enough resources to craft?

Answer 1

Try this :
itemModel.find({
$or: [{ craftingReagents: { $elemMatch: { name: 'Wood', amount: { $lte: 6 } } } },
{ craftingReagents: { $elemMatch: { name: 'Stone', amount: { $lte: 2 } } } }]
})