Merge pull request #2395 from vpontis/error-parsing

add different error format for 23505 error on postgres

lib/dialects/postgres/query.js

@@ -256,15 +256,24 @@ module.exports = (function() {
           parent: err
         });
       case '23505':
-        match = err.detail.match(/Key \((.*?)\)=\((.*?)\) already exists/);
-
-        return new sequelizeErrors.UniqueConstraintError({
-          fields: match[1].split(', '),
-          value: match[2].split(', '),
-          index: null,
-          parent: err
-        });
-
+        // there are multiple different formats of error messages for this error code
+        // this regex should check at least two
+        match = err.detail.match(/Key \((.*?)\)=\((.*?)\)/);
+
+        if (match) {
+          return new sequelizeErrors.UniqueConstraintError({
+            fields: match[1].split(', '),
+            value: match[2].split(', '),
+            index: null,
+            parent: err
+          });
+        } else {
+          return new sequelizeErrors.UniqueConstraintError({
+            error: err,
+            message: err.message
+          });
+        }
+        break;
       default:
         return new sequelizeErrors.DatabaseError(err);
     }