Warning instead of raising config errors

lib/doorkeeper.rb

@@ -118,9 +118,10 @@ class << self
     attr_reader :orm_adapter
 
     def configure(&block)
-      @config = Config::Builder.new(&block).build
+      builder = Config::Builder.new(&block)
+      @config = builder.config
       setup
-      @config
+      builder.build
     end
 
     # @return [Doorkeeper::Config] configuration instance

lib/doorkeeper/config/validations.rb

@@ -11,6 +11,7 @@ def validate!
         validate_reuse_access_token_value
         validate_token_reuse_limit
         validate_secret_strategies
+        validate_custom_access_token_attributes
       end
 
       private
@@ -48,6 +49,27 @@ def validate_token_reuse_limit
         )
         @token_reuse_limit = 100
       end
+
+      # Validate that the access_token and access_grant models
+      # both respond to all of the custom attributes
+      def validate_custom_access_token_attributes
+        return if custom_access_token_attributes.blank?
+
+        unrecognized_attributes = []
+        custom_access_token_attributes.each do |attrib|
+          [access_token_model, access_grant_model].each do |model|
+            next if model.has_attribute?(attrib)
+
+            unrecognized_attributes << attrib
+            ::Rails.logger.warn(
+              "[DOORKEEPER] #{access_token_model} does not respond to custom attribute '#{attrib}'. " \
+              "This custom attribute will be ignored.",
+            )
+          end
+        end
+
+        @custom_access_token_attributes -= unrecognized_attributes
+      end
     end
   end
 end