Fix guarding rules with nested values specified as a hash

lib/dry/validation/contract.rb

@@ -119,6 +119,10 @@ def inspect
       def error?(result, spec)
         path = Schema::Path[spec]
 
+        if path.multi_value?
+          return path.expand.any? { |nested_path| error?(result, nested_path) }
+        end
+
         return true if result.error?(path)
 
         path

lib/dry/validation/schema_ext.rb

@@ -5,6 +5,18 @@
 
 module Dry
   module Schema
+    class Path
+      # @api private
+      def multi_value?
+        last.is_a?(Array)
+      end
+
+      # @api private
+      def expand
+        to_a[0..-2].product(last).map { |spec| self.class[spec] }
+      end
+    end
+
     # @api private
     #
     # TODO: this should be moved to dry-schema at some point

spec/integration/contract/class_interface/rule/nested_data_spec.rb

@@ -41,6 +41,29 @@
     end
   end
 
+  context 'with a rule that depends on two nested values' do
+    let(:contract_class) do
+      Class.new(Dry::Validation::Contract) do
+        params do
+          required(:event).schema do
+            required(:active_from).value(:date)
+            required(:active_until).value(:date)
+          end
+        end
+
+        rule(event: %i[active_from active_until]) do
+          key.failure('invalid dates') if value[0] < value[1]
+        end
+      end
+    end
+
+    it 'does not execute rule when the schema checks failed' do
+      result = contract.(event: { active_from: Date.today, active_until: nil })
+
+      expect(result.errors.to_h).to eql(event: { active_until: ['must be a date'] })
+    end
+  end
+
   context 'with a nested array' do
     let(:contract_class) do
       Class.new(Dry::Validation::Contract) do