How to Search MongoDB Nested Subdocuments Within Different Deeps

Question

I'm having some subdocument in MongoDB that occasionally include different types - string, another subdocument, another nested subdocument etc. I'm trying to build a query that will search within this subdocument content regardless of it's type.

Given the following documents:

{ name: "test1", content: "test contents"}
{ name: "test2", content: {family: "tests family content", last: "another test content"} }
{ name: "test3", content: {subdocument: {family: "super family contents", last: "last test content"} } }

I want to use a query that will search within all strings within all documents and subdocuments. Already tried the following query, but it returns only the most nested level of subdocument - content.subdocument.family:

{ $or: [
    {"content": {'$regex': '.*conten.*', '$options': 'i'}},
    {"content.family": {'$regex': '.*conten.*', '$options': 'i'}},
    {"content.last": {'$regex': '.*conten.*', '$options': 'i'}},
    {"content.subdocument.family": {'$regex': '.*conten.*', '$options': 'i'}},
    {"content.subdocument.last": {'$regex': '.*conten.*', '$options': 'i'}}
]}

Is it possible to create one query that will iterate over all nested strings\deeps at once?

Answer 1

Here you are missing syntax of $or in $regex. You should use $or like following:

db.collection.find({
    $or: [{
    "content": {
        '$regex': '.*conten.*',
        '$options': 'i'
    }
    }, {
    "content.family": {
        '$regex': '.*conten.*',
        '$options': 'i'
    }
    }, {
    "content.last": {
        '$regex': '.*conten.*',
        '$options': 'i'
    }
    }, {
    "content.subdocument.family": {
        '$regex': '.*conten.*',
        '$options': 'i'
    }
    }, {
    "content.subdocument.last": {
        '$regex': '.*conten.*',
        '$options': 'i'
    }
    }]
})

Edit:

Above query gives following result:

[{
    "_id": ObjectId("55f41b6aef4766c946112a2d"),
    "name": "test1",
    "content": "test contents"
}, {
    "_id": ObjectId("55f41b6aef4766c946112a2e"),
    "name": "test2",
    "content": {
    "family": "tests family content",
    "last": "another test content"
    }
}, {
    "_id": ObjectId("55f41b6aef4766c946112a2f"),
    "name": "test3",
    "content": {
    "subdocument": {
        "family": "super family contents",
        "last": "last test content"
    }
    }
}]