Searching for documents in MongoDB

Once the documents have been inserted into the collection, they can be searched for using the find() class method.

Note

The find() method is a class method, which means that it is used by prefixing it with the class name associated with the model, for example, Client.find().

The find(conditions, callback) method is used to perform a search in the collection associated with the model, then to retrieve the results of the search in the callback function indicated as a parameter.

Let’s take an in-depth look at the parameters:

• The conditions parameter is a JavaScript object used to specify search conditions. If no condition is specified, do not indicate anything (or indicate an empty object {}).
• The callback function is of the form callback(err, results) where err is an error message (null otherwise) and results is an array containing the search results (empty [] if none).

There is also the findOne(conditions, callback...