Evaluate ransackable_scopes before attributes when building the query

lib/ransack/search.rb

@@ -43,10 +43,10 @@ def build(params)
       collapse_multiparameter_attributes!(params).each do |key, value|
         if ['s'.freeze, 'sorts'.freeze].freeze.include?(key)
           send("#{key}=", value)
-        elsif base.attribute_method?(key)
-          base.send("#{key}=", value)
         elsif @context.ransackable_scope?(key, @context.object)
           add_scope(key, value)
+        elsif base.attribute_method?(key)
+          base.send("#{key}=", value)
         elsif !Ransack.options[:ignore_unknown_conditions] || !@ignore_unknown_conditions
           raise ArgumentError, "Invalid search term #{key}"
         end

spec/ransack/search_spec.rb

@@ -312,6 +312,29 @@ module Ransack
         expect { Search.new(Person, params) }.not_to change { params }
       end
 
+      context "ransackable_scope" do
+        around(:each) do |example|
+          Person.define_singleton_method(:name_eq) do |name|
+            self.where(name: name)
+          end
+
+          begin
+            example.run
+          ensure
+            Person.singleton_class.undef_method :name_eq
+          end
+        end
+
+        it "is prioritized over base predicates" do
+          allow(Person).to receive(:ransackable_scopes)
+            .and_return(Person.ransackable_scopes + [:name_eq])
+
+          s = Search.new(Person, name_eq: "Johny")
+          expect(s.instance_variable_get(:@scope_args)["name_eq"]).to eq("Johny")
+          expect(s.base[:name_eq]).to be_nil
+        end
+      end
+
     end
 
     describe '#result' do