构建同时包含字符串和正则表达式模式的$ in数组

Question

I have a Mongo collection where every document in the collection has a sources array property. Searches on this property can be a combination of exact matches and regex. For example, when using Mongo shell, the query below searches for documents with source='gas valves' OR 'hose' is contained in source item. This works just as I expect

db.notice.find({sources:{$in:[/\bhose/i,'gas valves']}})

Things get a little trickier in mgo. Because some items in the $in array can be regex, and the others strings - the only way I have figured to make a query is by using $or:

var regEx []bson.RegEx
var matches []string
// do stuff to populate regEx and matches
filter["$or"] = []bson.M{
    {"sources":bson.M{"$in":regEx}},
    {"sources":bson.M{"$in":matches}},
}

Is there some way I could construct one slice with both regex and string to use with $in - eliminating the need for the $or

Answer 1

Use []interface{}:

matches := []interface{}{
    bson.RegEx{"jo.+", "i"},
    "David",
    "Jenna",
}

db.C("people").Find(bson.M{"name": bson.M{"$in": matches}})

[] means slice and interface{} means any type. Put together, []interface{} is a slice of any type.