fix method_missing

lib/ransack/nodes/grouping.rb

@@ -107,6 +107,14 @@ def groupings=(groupings)
       end
       alias :g= :groupings=
 
+      def respond_to_missing?(method_id, include_private = false)
+        method_name = method_id.to_s.dup
+        writer = method_name.sub!(/\=$/, ''.freeze)
+        return true if attribute_method?(method_name)
+
+        super
+      end
+
       def method_missing(method_id, *args)
         method_name = method_id.to_s.dup
         writer = method_name.sub!(/\=$/, ''.freeze)

lib/ransack/search.rb

@@ -99,6 +99,15 @@ def new_sort(opts = {})
       Nodes::Sort.new(@context).build(opts)
     end
 
+    def respond_to_missing?(method_id, include_private = false)
+      method_name = method_id.to_s
+      getter_name = method_name.sub(/=$/, ''.freeze)
+      return true if base.attribute_method?(getter_name)
+      return true if @context.ransackable_scope?(getter_name, @context.object)
+
+      super
+    end
+
     def method_missing(method_id, *args)
       method_name = method_id.to_s
       getter_name = method_name.sub(/=$/, ''.freeze)

spec/ransack/search_spec.rb

@@ -689,6 +689,14 @@ def remove_quotes_and_backticks(str)
         ]
         expect(@s.groupings.first.children_name_eq).to eq 'Ernie'
       end
+
+      it 'respond_to? method_missing' do
+        @s.groupings = [
+          { m: 'or', name_eq: 'Ernie', children_name_eq: 'Ernie' }
+        ]
+        expect(@s.groupings.first.respond_to?(:children_name_eq)).to eq true
+        expect(@s.groupings.first.method(:children_name_eq)).to be_truthy
+      end
     end
   end
 end