Mongo-Style Selectors
The simplest selectors are just a string or Mongo.ObjectID. These selectors match the document with that value in its _id field.
A slightly more complex form of selector is an object containing a set of keys that must match in a document:
// Matches all documents where deleted is false
{deleted: false}
// Matches all documents where the name and cognomen are as given
{name: "Rhialto", cognomen: "the Marvelous"}
// Matches every document
{}
But they can also contain more complicated tests:
// Matches documents where age is greater than 18
{age: {$gt: 18}}
// Also matches documents where tags is an array containing "popular"
{tags: "popular"}
// Matches documents where fruit is one of three possibilities
{fruit: {$in: ["peach", "plum", "pear"]}}
See the complete documentation.
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