Support x-nullable in respone_validator

rswag-specs/lib/rswag/specs/extended_schema.rb

@@ -0,0 +1,25 @@
+require 'json-schema'
+
+module Rswag
+  module Specs
+    class ExtendedSchema < JSON::Schema::Validator
+
+      def initialize
+        super
+        extend_schema_definition("http://json-schema.org/draft-04/schema#")
+        @attributes['type'] = ExtendedTypeAttribute
+        @uri = URI.parse('http://tempuri.org/rswag/specs/extended_schema')
+      end
+    end
+
+    class ExtendedTypeAttribute < JSON::Schema::TypeV4Attribute
+
+      def self.validate(current_schema, data, fragments, processor, validator, options={})
+        return if data.nil? && current_schema.schema['x-nullable'] == true
+        super
+      end
+    end
+
+    JSON::Validator.register_validator(ExtendedSchema.new)
+  end
+end

rswag-specs/lib/rswag/specs/response_validator.rb

@@ -1,4 +1,6 @@
+require 'active_support/core_ext/hash/slice'
 require 'json-schema'
+require 'rswag/specs/extended_schema'
 
 module Rswag
   module Specs
@@ -23,10 +25,14 @@ module Rswag
       end
 
       def validate_body!(body)
-        schema = @api_metadata[:response][:schema]
-        return if schema.nil?
+        response_schema = @api_metadata[:response][:schema]
+        return if response_schema.nil?
+
         begin
-          JSON::Validator.validate!(schema.merge(@global_metadata), body)
+          validation_schema = response_schema
+            .merge('$schema' => 'http://tempuri.org/rswag/specs/extended_schema')
+            .merge(@global_metadata.slice(:definitions))
+          JSON::Validator.validate!(validation_schema, body)
         rescue JSON::Schema::ValidationError => ex
           raise UnexpectedResponse, "Expected response body to match schema: #{ex.message}" 
         end