Allow storing static preferences using string class names

core/lib/spree/core/engine.rb

@@ -87,6 +87,7 @@ class Engine < ::Rails::Engine
 
       config.after_initialize do
         Spree::Config.check_load_defaults_called('Spree::Config')
+        Spree::Config.static_model_preferences.validate!
       end
 
       config.after_initialize do

core/lib/spree/preferences/static_model_preferences.rb

@@ -7,13 +7,8 @@ class Definition
         attr_reader :preferences
 
         def initialize(klass, hash)
-          hash = hash.symbolize_keys
-          hash.keys.each do |key|
-            if !klass.defined_preferences.include?(key)
-              raise "Preference #{key.inspect} is not defined on #{klass}"
-            end
-          end
-          @preferences = hash
+          @klass = klass
+          @preferences = hash.symbolize_keys
         end
 
         def fetch(key, &block)
@@ -27,6 +22,8 @@ def []=(key, value)
         def to_hash
           @preferences.deep_dup
         end
+
+        delegate :keys, to: :@preferences
       end
 
       def initialize
@@ -36,12 +33,32 @@ def initialize
       end
 
       def add(klass, name, preferences)
-        @store[klass.to_s][name] = Definition.new(klass, preferences)
+        @store[klass.to_s][name] = Definition.new(klass.to_s, preferences)
       end
 
       def for_class(klass)
         @store[klass.to_s]
       end
+
+      def validate!
+        @store.keys.map(&:constantize).each do |klass|
+          validate_for_class!(klass)
+        end
+      end
+
+      private
+
+      def validate_for_class!(klass)
+        for_class(klass).each do |name, preferences|
+          klass_keys = klass.defined_preferences.map(&:to_s)
+          extra_keys = preferences.keys.map(&:to_s) - klass_keys
+          next if extra_keys.empty?
+
+          raise \
+            "Unexpected keys found for #{klass} under #{name}: #{extra_keys.sort.join(', ')} " \
+            "(expected keys: #{klass_keys.sort.join(', ')})"
+        end
+      end
     end
   end
 end

core/spec/models/spree/preferences/static_model_preferences_spec.rb

@@ -31,12 +31,6 @@ module Spree
       expect(definitions['my_definition'].fetch(:color)).to eq("blue")
     end
 
-    it "errors assigning invalid preferences" do
-      expect {
-        subject.add(preference_class, 'my_definition', { ice_cream: 'chocolate' })
-      }.to raise_error(/\APreference :ice_cream is not defined/)
-    end
-
     context "with stored definitions" do
       before do
         subject.add(preference_class, 'light', { color: 'white' })
@@ -83,5 +77,18 @@ module Spree
         expect(subject.for_class(other_class)).to be_empty
       end
     end
+
+    describe '.validate!' do
+      it "errors assigning invalid preferences" do
+        stub_const("SomeClass", preference_class)
+        subject.add(preference_class, 'my_definition', { ice_cream: 'chocolate', spoon: true })
+
+        expect {
+          subject.validate!
+        }.to raise_error(
+          /\AUnexpected keys found for SomeClass under my_definition: ice_cream, spoon \(expected keys: color\)/
+        )
+      end
+    end
   end
 end