1 files changed, 26 insertions, 0 deletions
diff --git a/rubocop/cop/migration/remove_index.rb b/rubocop/cop/migration/remove_index.rb
new file mode 100644
index 00000000000..613b35dd00d
--- /dev/null
+++ b/rubocop/cop/migration/remove_index.rb
@@ -0,0 +1,26 @@
+require_relative '../../migration_helpers'
+
+module RuboCop
+  module Cop
+    module Migration
+      # Cop that checks if indexes are removed in a concurrent manner.
+      class RemoveIndex < RuboCop::Cop::Cop
+        include MigrationHelpers
+
+        MSG = '`remove_index` requires downtime, use `remove_concurrent_index` instead'.freeze
+
+        def on_def(node)
+          return unless in_migration?(node)
+
+          node.each_descendant(:send) do |send_node|
+            add_offense(send_node, :selector) if method_name(send_node) == :remove_index
+          end
+        end
+
+        def method_name(node)
+          node.children[1]
+        end
+      end
+    end
+  end
+end