Question

I have some problems with mongoDB, i looked for an answer but i couldn’t find anything
that solves my problem….

db.coders.save( {
'name': 'John', 
'languages' : { 'php':'bad','java':'good','brainfuck':'very bad'} 
});

db.coders.save( {
'name': 'Sarah', 
'languages' : { 'php':'good','java':'bad','brainfuck':'very bad'} 
});

db.coders.save( {
'name': 'Tom', 
'languages' : { 'php':'very good','java':'good','brainfuck':'bad'} 
});

now i want to find any coder that knows any language ‘very good’…how?

Answer 1

You could not find it because it is impossible. None of the search operators works on the schema you provided.

The easiest workaround is to change schema a little bit:

db.coders.save( {
'name': 'John', 
'languages' : [ { n: 'php', v: 'bad'},{n:'java', v: 'good'},{n : 'brainfuck', v: 'very bad'}] 
});

In such a case you can query the data using the following query:

db.coders.find({'languages.v' : 'good'})