#MongoDB - search, sort and pagination

##Summary Implement DAO layer responsible for retrieving data from MongoDB.

##Goal Your goal is to write search method using the /app/DAO/phoneDAO file as your solution. The search operation will be performed on the collection with the following structure:

{
    model: String,
    brand: String,
    state: String
}

Our DAO method accepts the parameter object with following properties: search, skip, limit, sortDir, sortBy where search is a string to search for, sortDircan be set to 'ASC or 'DESC' and sortBy is name of the field to sort by. Properties skip and limit should be a number.

You need to fill DAO method in accordance to the guidelines:

• it should return a promise,
• the result of the search (by default) should be sorted ascending by _id field and return two elements,
• returned data structure should be like: { results: [], total: int }, where results are found data and total is a number of all elements in the collection.

##Setup To install dependencies from package.json:

npm install

To run tests in development mode:

mocha --watch

To run verify jshint, tests and coverage:

npm test

To run verify jshint, tests and coverage with human readable output:

grunt --force

Good luck!