Is it possible to execute a function in Mongo that accepts any parameters?
- by joshua.clayton
I'm looking to write a function to do a custom query on a collection in Mongo. Problem is, I want to reuse that function. My thought was this (obviously contrived):
var awesome = function(count) {
return function() {
return this.size == parseInt(count);
};
}
So then I could do something along the lines of:
db.collection.find(awesome(5));
However, I get this error:
error: {
"$err" : "error on invocation of $where function:
JS Error: ReferenceError: count is not defined nofile_b:1"
}
So, it looks like Mongo isn't honoring scope, but I'm really not sure why. Any insight would be appreciated.
To go into more depth of what I'd like to do:
A collection of documents has lat/lng values, and I want to find all documents within a concave or convex polygon. I have the function written but would ideally be able to reuse the function, so I want to pass in an array of points composing my polygon to the function I execute on Mongo's end. I've looked at Mongo's geospatial querying and it currently on supports circle and box queries - I need something more complex.
