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I wannt to create code like this:

var result = Attributes.find({
    attribute_name : {
    $exist : true,
    $in : [1]
 }
});

but programmatically, so i ceate code like this:

var genQuery = '{ "' + by + '" : { "$exists" : true, "$in" : [' + data + ']} }';
var result = Attributes.find(genQuery);

but I get error maximum call stack

because result of JSON.parse(genQuery)

{ _id: { '$exists': true, '$in': [ 1 ] } }

How to query in mongodb programmatically?

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1 Answer 1

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Your genQuery variable you declare is a String, but you cannot pass strings as selectors or modifiers in find() functions. You should create an Object to make it works: 

var genQuery = {};
//use this notation to declare a new object key depending on a variable
genQuery[by] = {
  $exists: true, 
  $in: [1]
};

var result = Attributes.find(genQuery);
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6 Comments

I tested it in an existing collecting, it should work, do you get any error?
still same "maximum call stack"
when i console log it, same like this : { _id: { '$exists': true, '$in': [ 1 ] } } there '' surround $exist
remove the ' ' for $exists and $in, they are object keys not string.
As I show in my answer you don't need JSON.parse, just create an Object directly, instead of writing some kind of "object like string" and then parse it.
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