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-rw-r--r--rubocop/cop/migration/add_reference.rb49
1 files changed, 49 insertions, 0 deletions
diff --git a/rubocop/cop/migration/add_reference.rb b/rubocop/cop/migration/add_reference.rb
new file mode 100644
index 00000000000..4b67270c97a
--- /dev/null
+++ b/rubocop/cop/migration/add_reference.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+require_relative '../../migration_helpers'
+
+module RuboCop
+ module Cop
+ module Migration
+ # Cop that checks if a foreign key constraint is added and require a index for it
+ class AddReference < RuboCop::Cop::Cop
+ include MigrationHelpers
+
+ MSG = '`add_reference` requires `index: true`'
+
+ def on_send(node)
+ return unless in_migration?(node)
+
+ name = node.children[1]
+
+ return unless name == :add_reference
+
+ opts = node.children.last
+
+ add_offense(node, location: :selector) unless opts && opts.type == :hash
+
+ index_present = false
+
+ opts.each_node(:pair) do |pair|
+ index_present ||= index_enabled?(pair)
+ end
+
+ add_offense(node, location: :selector) unless index_present
+ end
+
+ private
+
+ def index_enabled?(pair)
+ hash_key_type(pair) == :sym && hash_key_name(pair) == :index && pair.children[1].true_type?
+ end
+
+ def hash_key_type(pair)
+ pair.children[0].type
+ end
+
+ def hash_key_name(pair)
+ pair.children[0].children[0]
+ end
+ end
+ end
+ end
+end