don't assert primary key in response if no read adapter

lib/perry/middlewares/model_bridge.rb

@@ -37,7 +37,7 @@ def build_models_from_records(records, options)
   def update_model_after_save(response, model)
     model.saved = response.success
     if model.saved
-      if model.new_record?
+      if model.new_record? && !model.read_adapter.nil?
         key = response.model_attributes[model.primary_key]
         raise Perry::PerryError.new('primary key not included in response') if key.nil?
         model.send("#{model.primary_key}=", key)

test/unit/middlewares/model_bridge_test.rb

@@ -73,7 +73,7 @@ def call(options)
       end
 
       teardown do
-        @model.read_adapter.reset
+        @model.read_adapter.reset if @model.read_adapter
         @model.write_adapter.reset
       end
 
@@ -105,6 +105,15 @@ def call(options)
             @bridge.new(adapter).call(@options)
           end
         end
+
+        should "not raise if model does not have a read_adapter configured" do
+          @klass.send(:read_with, :none)
+          assert_nothing_raised do
+            adapter = SuccessAdapter.new
+            adapter.response.parsed = nil
+            @bridge.new(adapter).call(@options)
+          end
+        end
       end
 
       should "set the model's :saved attribute to true on success" do