search in combination two field in Mongodb - mongodb

Question

I use from Mongodb and my database schema like this:
firstName: 'vahid',
lastName: 'kh',
age: 12
I want find all records that firstname + lastname likes 'vahid kh'. In SQL, this would be:
Select * from table where firstName + lastName like '%vahid kh%'

Answer 1

Seems this is available only in 2.4, which was released today.
> db.temp.save({ "firstName" : "Bob", "lastName" : "Smith", Age : 12 });
> db.temp.find();
{ "_id" : ObjectId("5148a2a00477cddcdece1b34"), "firstName" : "Bob", "lastName" : "Smith", "Age" : 12 }
> db.temp.aggregate({ $project : { "name" : { $concat : [ "$firstName", " ", "$lastName" ] } } });
{
"result" : [
{
"_id" : ObjectId("5148a2a00477cddcdece1b34"),
"name" : "Bob Smith"
}
],
"ok" : 1
}

Answer 2

You can use $regex, this way you can use partial matches.
Something like that:
db.collection.find( { field: /acme.*corp/i } )
Here is somewhat similar question with answer in php: MongoRegex and search multiple rows in collection
Docs about mongoregex are here: http://docs.mongodb.org/manual/reference/operator/regex/
Edit:
I just read your comment with query in sql. Simple solution could be to make field fullname and search it with $regex, it is kind of db denormalization, where you store somewhat redundant data.
Or even easier, this should do the job too:
db.collection.find( { firstName: /*vahid/i, lastName: /kh*/i } )

Answer 3

To search against a combination of two or more fields, you need to use the aggregation framework. It lets you sort by the combinations of fields, and you don't need to store (denormalize) any extra fields:
db.collection.aggregate([
{
$match: {
// Optional criteria to select only some documents to process, such as...
deleted: null
}
},
{
$addFields: {
// Need to prefix fields with '$'
fullName: { $concat: [ "$firstName", "$lastName" ] },
}
},
{
$search: { fullName: /.*vakid kh.*/ },
}
]);
Explanation:
the $addFields aggregation pipeline stage creates dynamic, on-the-fly fields
$concat creates the fullName field by concatenating the first and last name
$search does a regular expression search, which is the MongoDB equivalent to the SQL LIKE operator.

Answer 4

I have code in expressjs code aggregate is bit slow then find so I have use conditional based and use regular express to find true results, I am sharing with you nodejs code I hope it useful for you or my other code lover friends.
router.get('/publisher/:q',function(req,res){
var q = ucfirst( req.params['q'] );
var qSplit = q.split(" ");
var db = mongojs(CONNECTION_STRING, ['tags_helper','users']);
var query = { "status" : 1, isAdmin : { $exists : false } };
console.log(qSplit);
if( qSplit.length > 1 )
{
query["firstName"] = new RegExp(qSplit[0],"i");
query["lastName"] = new RegExp(qSplit[1],"i");
}
else
{
qSplit[0] = new RegExp(qSplit[0],"i");
qSplit[1] = new RegExp(qSplit[0],"i");
//query.push( { $or : [ {"firstName": new RegExp(q,"i")},{"lastName": new RegExp(q,"i")} ] } );
query["$or"] = [ {"firstName": new RegExp(q,"i")},{"lastName": new RegExp(q,"i")} ];
}
db.users.find( query,{_id : 1,firstName:1,lastName:1,image:1,profileName:1}).limit(10,function (err, users) {
//TODO your further code ..
});
});
Have a happy coding day.