Alias 'this' because we're in a closure

lib/dialect/postgres.js

@@ -41,9 +41,10 @@ Postgres.prototype._getParameterValue = function(value, quoteChar) {
   } else if ('object' === typeof value) {
     if (_.isArray(value)) {
       // convert each element of the array
+      var self = this;
       value = value.map(function (item) {
           // In a Postgres array, strings must be double-quoted
-          return this._getParameterValue(item, '"');
+          return self._getParameterValue(item, '"');
       });
       value = '\'{' + value.join(',') + '}\'';
     } else if (_.isFunction(value.toISOString)) {