From 87eaa5ef67900a7d457560e7df821e95debd58ec Mon Sep 17 00:00:00 2001
From: Alexandcoats <alexandcoats@gmail.com>
Date: Fri, 17 Mar 2023 14:14:07 -0400
Subject: [PATCH] fix(db): remove parents index and fix the query (#1195)

* Remove parents index, use hint instead

* Fix children query

* Imports
---
 src/bin/inx-chronicle/migrations/migrate_1.rs |  1 +
 src/db/mongodb/collections/block.rs           | 17 +++++------------
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/src/bin/inx-chronicle/migrations/migrate_1.rs b/src/bin/inx-chronicle/migrations/migrate_1.rs
index e3940fe0a..6119c5c67 100644
--- a/src/bin/inx-chronicle/migrations/migrate_1.rs
+++ b/src/bin/inx-chronicle/migrations/migrate_1.rs
@@ -32,6 +32,7 @@ impl Migration for Migrate {
         collection
             .drop_index("output_immutable_alias_address_unlock_index", None)
             .await?;
+        collection.drop_index("block_parents_index", None).await?;
 
         Ok(())
     }
diff --git a/src/db/mongodb/collections/block.rs b/src/db/mongodb/collections/block.rs
index 67a255ea3..3a67f7c10 100644
--- a/src/db/mongodb/collections/block.rs
+++ b/src/db/mongodb/collections/block.rs
@@ -121,15 +121,6 @@ impl MongoDbCollection for BlockCollection {
         )
         .await?;
 
-        self.create_index(
-            IndexModel::builder()
-                .keys(doc! { "block.parents": 1 })
-                .options(IndexOptions::builder().name("block_parents_index".to_string()).build())
-                .build(),
-            None,
-        )
-        .await?;
-
         Ok(())
     }
 }
@@ -215,12 +206,14 @@ impl BlockCollection {
             .aggregate(
                 [
                     doc! { "$match": {
-                        "metadata.referenced_by_milestone_index": { "$gte": block_referenced_index },
-                        "metadata.referenced_by_milestone_index": { "$lte": max_referenced_index },
+                        "metadata.referenced_by_milestone_index": {
+                            "$gte": block_referenced_index,
+                            "$lte": max_referenced_index
+                        },
                         "block.parents": block_id,
                     } },
-                    doc! { "$skip": (page_size * page) as i64 },
                     doc! { "$sort": {"metadata.referenced_by_milestone_index": -1} },
+                    doc! { "$skip": (page_size * page) as i64 },
                     doc! { "$limit": page_size as i64 },
                     doc! { "$project": { "_id": 1 } },
                 ],