1 files changed, 1 insertions, 10 deletions
diff --git a/app/models/deployment.rb b/app/models/deployment.rb
index b69cda4f2f9..68586e7a1fd 100644
--- a/app/models/deployment.rb
+++ b/app/models/deployment.rb
@@ -128,17 +128,8 @@ class Deployment < ApplicationRecord
       merge_requests = merge_requests.where("merge_request_metrics.merged_at >= ?", previous_deployment.finished_at)
     end
 
-    # Need to use `map` instead of `select` because MySQL doesn't allow `SELECT`ing from the same table
-    # that we're updating.
-    merge_request_ids =
-      if Gitlab::Database.postgresql?
-        merge_requests.select(:id)
-      elsif Gitlab::Database.mysql?
-        merge_requests.map(&:id)
-      end
-
     MergeRequest::Metrics
-      .where(merge_request_id: merge_request_ids, first_deployed_to_production_at: nil)
+      .where(merge_request_id: merge_requests.select(:id), first_deployed_to_production_at: nil)
       .update_all(first_deployed_to_production_at: finished_at)
   end