Mongoose.js: Find user by username LIKE value

问题

I like to to go find a user in mongoDb by looking for a user called value. The problem with:

username: 'peter'

is that i dont find it if the username is "Peter", or "PeTER".. or something like that.

So i want to do like sql

SELECT * FROM users WHERE username LIKE 'peter'

Hope you guys get what im askin for?

Short: 'field LIKE value' in mongoose.js/mongodb

回答1:

Well. Just for people who are lookin for the answer i was i did like this

var name = 'Peter';
model.findOne({name: new RegExp('^'+name+'$', "i")}, function(err, doc) {
  //Do your action here..
});

回答2:

I had problems with this recently, i use this code and work fine for me.

var data = 'Peter';

db.User.find({'name' : new RegExp(data, 'i')}, function(err, docs){
    cb(docs);
});

Use directly /Peter/i work, but i use '/'+data+'/i' and not work for me.

回答3:

db.users.find( { 'username' : { '$regex' : req.body.keyWord, '$options' : 'i' } } )

回答4:

collection.findOne({
    username: /peter/i
}, function (err, user) {
    assert(/peter/i.test(user.username))
})

回答5:

You should use a regex for that.

db.users.find({name: /peter/i});

Be wary, though, that this query doesn't use index.

回答6:

router.route('/product/name/:name')
.get(function(req, res) {

    var regex = new RegExp(req.params.name, "i")
    ,   query = { description: regex };

    Product.find(query, function(err, products) {
        if (err) {
            res.json(err);
        }

        res.json(products);
    });

});

回答7:

mongoose doc for find. mongodb doc for regex.

var Person = mongoose.model('Person', yourSchema);
// find each person with a name contains 'Ghost'
Person.findOne({ "name" : { $regex: /Ghost/, $options: 'i' } },
    function (err, person) {
             if (err) return handleError(err);
             console.log('%s %s is a %s.', person.name.first, person.name.last, person.occupation);
});

Note the first argument we pass to mongoose.findOne function: { "name" : { $regex: /Ghost/, $options: 'i' } }, "name" is the field of the document you are searching, "Ghost" is the regular expression, "i" is for case insensitive match. Hope this will help you.

回答8:

The following query will find the documents with required string case insensitively and with global occurrence also

var name = 'Peter';
    db.User.find({name:{
                         $regex: new RegExp(name, "ig")
                     }
                },function(err, doc) {
                                     //Your code here...
              });

回答9:

This is what I'm using.

module.exports.getBookByName = function(name,callback){
    var query = {
            name: {$regex : name}
    }
    User.find(query,callback);
}

回答10:

Here my code with expressJS:

router.route('/wordslike/:word')
    .get(function(request, response) {
            var word = request.params.word;       
            Word.find({'sentence' : new RegExp(word, 'i')}, function(err, words){
               if (err) {response.send(err);}
               response.json(words);
            });
         });

回答11:

if I want to query all record at some condition，I can use this:

if (userId == 'admin')
  userId = {'$regex': '.*.*'};
User.where('status', 1).where('creator', userId);

回答12:

Just complementing @PeterBechP 's answer.

Don't forget to scape the special chars. https://stackoverflow.com/a/6969486

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}

var name = 'Peter+with+special+chars';

model.findOne({name: new RegExp('^'+escapeRegExp(name)+'$', "i")}, function(err, doc) {
  //Do your action here..
});

来源：https://stackoverflow.com/questions/9824010/mongoose-js-find-user-by-username-like-value

标签

javascript

node.js

mongodb

find

mongoose