mongodb find element in array or less but no other - mongodb

Question

I have this collection:
{
"title": "First Item",
"attributes": [
{
"id": "1",
"text": "Alpha"
},
{
"id": "2",
"text": "Bravo"
},
{
"id": "3",
"text": "Charlie"
}
]
},
{
"title": "Second Item",
"attributes": [
{
"id": "1",
"text": "Alpha"
},
{
"id": "2",
"text": "Bravo"
},
{
"id": "3",
"text": "Tango"
}
]
}
Trying search with these values for "attributes.text" field:
{ "Alpha", "Bravo", "Charlie", "Delta" }
I want to find only "First Item" document that contains at least these keys but no others.
But trying these values:
{ "Alpha", "Bravo", "Delta" }
or
{ "Alpha", "Bravo" }
I do not want to find any result (beacuse "Charlie" is missing).
Thank you

Answer 1

Use the $in operator to match values in the attributes object array. The following query will select all documents in the collection where the text field value of the attribute object array is either "Alpha", "Bravo" or "Delta":
dbo.collection.find({
"attributes.text": {
"$in": ["Alpha", "Bravo", "Delta"]
}
});
This will return the two documents:
/* 0 */
{
"_id" : ObjectId("551187bae3757367bf8bd915"),
"title" : "First Item",
"attributes" : [
{
"id" : "1",
"text" : "Alpha"
},
{
"id" : "2",
"text" : "Bravo"
},
{
"id" : "3",
"text" : "Charlie"
}
]
}
/* 1 */
{
"_id" : ObjectId("551187bae3757367bf8bd916"),
"title" : "Second Item",
"attributes" : [
{
"id" : "1",
"text" : "Alpha"
},
{
"id" : "2",
"text" : "Bravo"
},
{
"id" : "3",
"text" : "Tango"
}
]
}