update.js

/**
 * Update Behaviors
 */

var helpers = require('../lib/update-helpers');
var utils = require('../lib/utils');

/**
 * Increment column
 * Example:
 *  { $inc: { clicks: 1 } }
 * @param  {Object} Hash whose keys are the columns to inc and values are how much it will inc
 */
helpers.add('$inc', function(value, values, collection){
  var output = "";

  for (var key in value){
    output += utils.quoteObject(key) + ' = ' + utils.quoteObject(key, collection) + ' + $' + values.push(value[key]);
  }

  return output;
});

/**
 * Decrement column
 * Example:
 *  { $dec: { clicks: 1 } }
 * @param  {Object} Hash whose keys are the columns to dec and values are how much it will inc
 */
helpers.add('$dec', function(value, values, collection){
  var output = "";

  for (var key in value){
    output += utils.quoteObject(key) + ' = ' + utils.quoteObject(key, collection) + ' - $' + values.push(value[key]);
  }

  return output;
});