A super simple base controller that a swagger API can use to do queries of a mongoDB table

base.js

var mongodb = require('mongodb');
var MongoClient = mongodb.MongoClient;

var baseController = function (collectionName) {
  var _settings = {
    url: 'mongodb://localhost:27017/ghfive',
    collectionName: collectionName
  };
  this.default = {
    get: function (req, res) {
      MongoClient.connect(_settings.url, function (err, db) {
        var collection = db.collection(_settings.collectionName);
        var query = req.query;
        var fieldFilter = {'_id': 0};
        if (query.selectedFields) {
          var onlyFields = query.selectedFields.split(',');
          for (var idx in onlyFields) {
            fieldFilter[onlyFields[idx]] = 1
          }
          delete query.selectedFields;
        }
        if (query.excludeFields) {
          fieldFilter = {'_id': 0};
          var excludeFields = query.excludeFields.split(',');
          for (var idx in excludeFields) {
            fieldFilter[excludeFields[idx]] = 0
          }
          delete query.excludeFields;
        }
        var skip = query.skip || -1;
        var limit = query.limit || -1;
        if (skip) {
          delete query.skip;
        }
        if (limit) {
          delete query.limit;
        }
        for (var prop in query) {
          var propVal = query[prop];
          query[prop] = {'$regex': new RegExp("^" + propVal.toLowerCase(), "i")};
        }
        var cursor = collection.find(query, fieldFilter);
        if (skip > -1) {
          cursor.skip(parseInt(skip));
        }
        if (limit > -1) {
          cursor.limit(parseInt(limit));
        }
        cursor.toArray(function (err, doc) {
          res.status(200).json({data: doc});
        });
      });
    }
  };
};


module.exports = baseController;