Correctly double quote strings within arrays for PG

lib/dialect/postgres.js

@@ -26,7 +26,7 @@ Postgres.prototype._getParameterText = function(index, value) {
   }
 };
 
-Postgres.prototype._getParameterValue = function(value) {
+Postgres.prototype._getParameterValue = function(value, quoteChar) {
   // handle primitives
   if (null === value) {
     value = 'NULL';
@@ -36,12 +36,15 @@ Postgres.prototype._getParameterValue = function(value) {
     // number is just number
     value = value;
   } else if ('string' === typeof value) {
-    // string uses single quote
+    // string uses single quote by default
-    value = this.quote(value, "'");
+    value = this.quote(value, quoteChar || "'");
   } else if ('object' === typeof value) {
     if (_.isArray(value)) {
       // convert each element of the array
-      value = _.map(value, this._getParameterValue, this);
+      value = value.map(function (item) {
+          // In a Postgres array, strings must be double-quoted
+          return this._getParameterValue(item, '"');
+      });
       value = '\'{' + value.join(',') + '}\'';
     } else if (_.isFunction(value.toISOString)) {
       // Date object's default toString format does not get parsed well