Delegate OpenStructWithHashAccess#key? to the underlying hash

lib/blacklight/utils.rb

@@ -26,7 +26,7 @@ def self.protected_attributes_enabled?
   ##
   # An OpenStruct that responds to common Hash methods
   class OpenStructWithHashAccess < OpenStruct
-    delegate :keys, :each, :map, :has_key?, :include?, :empty?, :length, :delete, :delete_if, :keep_if, :clear, :reject!, :select!, :replace, :fetch, :to_json, :as_json, to: :to_h
+    delegate :keys, :each, :map, :has_key?, :key?, :include?, :empty?, :length, :delete, :delete_if, :keep_if, :clear, :reject!, :select!, :replace, :fetch, :to_json, :as_json, to: :to_h
 
     if ::RUBY_VERSION < '2.0'
       def []=(key, value)

spec/lib/utils_spec.rb

@@ -48,6 +48,23 @@
 
     end
 
+    describe "#key?" do
+      subject do
+        h = Blacklight::OpenStructWithHashAccess.new
+        h[:a] = 1
+        h[:b] = 2
+        h
+      end
+
+      it "is true if the key exists" do
+        expect(subject.key? :a).to eq true
+      end
+
+      it "is false if the key does not exist" do
+        expect(subject.key? :c).to eq false
+      end
+    end
+
     describe "#replace" do
       subject { Blacklight::OpenStructWithHashAccess.new a: 1 }