Merge branch 'issuable-suggestions' into 'master'

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Closes #22071

See merge request gitlab-org/gitlab-ce!22866

1 files changed, 29 insertions, 0 deletions

diff --git a/lib/gitlab/graphql/loaders/batch_model_loader.rb b/lib/gitlab/graphql/loaders/batch_model_loader.rb
new file mode 100644
index 00000000000..5a0099dc6b1
--- /dev/null
+++ b/lib/gitlab/graphql/loaders/batch_model_loader.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module Loaders
+      class BatchModelLoader
+        attr_reader :model_class, :model_id
+
+        def initialize(model_class, model_id)
+          @model_class, @model_id = model_class, model_id
+        end
+
+        # rubocop: disable CodeReuse/ActiveRecord
+        def find
+          BatchLoader.for({ model: model_class, id: model_id }).batch do |loader_info, loader|
+            per_model = loader_info.group_by { |info| info[:model] }
+            per_model.each do |model, info|
+              ids = info.map { |i| i[:id] }
+              results = model.where(id: ids)
+
+              results.each { |record| loader.call({ model: model, id: record.id }, record) }
+            end
+          end
+        end
+        # rubocop: enable CodeReuse/ActiveRecord
+      end
+    end
+  end
+end