From 37de2f045629f0219c4d2d479850caa33307d04b Mon Sep 17 00:00:00 2001
From: Anton Vynogradenko <restuta8@gmail.com>
Date: Sun, 17 Feb 2019 17:12:57 -0800
Subject: [PATCH] add "removeIndex" before "addIndex"

This makes index creation operations idempotent. Migrations that create indexes now can be run multiple times without errors.
---
 lib/migrate.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/migrate.js b/lib/migrate.js
index 4ed5adc..836a24b 100644
--- a/lib/migrate.js
+++ b/lib/migrate.js
@@ -306,6 +306,12 @@ const parseDifference = function(previousState, currentState)
                     if (df.rhs.indexes)
                         for(let _i in df.rhs.indexes)
                         {
+                            actions.push(_.extend({
+                                actionType: 'removeIndex',
+                                tableName: tableName,
+                                depends: [ tableName ]
+                            }, _.clone(df.rhs.indexes[_i])));
+                            
                             actions.push(_.extend({
                                 actionType: 'addIndex', 
                                 tableName: tableName,