Merge pull request #1320 from cerebris/default_processor_klass_deprec…

…ation

Set default processor cass by name, deprecate default_processor_klass

lib/jsonapi/configuration.rb

@@ -18,7 +18,7 @@ class Configuration
                 :default_paginator,
                 :default_page_size,
                 :maximum_page_size,
-                :default_processor_klass,
+                :default_processor_klass_name,
                 :use_text_errors,
                 :top_level_links_include_pagination,
                 :top_level_meta_include_record_count,
@@ -110,7 +110,7 @@ def initialize
 
       # The default Operation Processor to use if one is not defined specifically
       # for a Resource.
-      self.default_processor_klass = JSONAPI::Processor
+      self.default_processor_klass_name = 'JSONAPI::Processor'
 
       # Allows transactions for creating and updating records
       # Set this to false if your backend does not support transactions (e.g. Mongodb)
@@ -225,9 +225,19 @@ def exception_class_whitelisted?(e)
     end
 
     def default_processor_klass=(default_processor_klass)
+      ActiveSupport::Deprecation.warn('`default_processor_klass` has been replaced by `default_processor_klass_name`.')
       @default_processor_klass = default_processor_klass
     end
 
+    def default_processor_klass
+      @default_processor_klass ||= default_processor_klass_name.safe_constantize
+    end
+
+    def default_processor_klass_name=(default_processor_klass_name)
+      @default_processor_klass = nil
+      @default_processor_klass_name = default_processor_klass_name
+    end
+
     def allow_include=(allow_include)
       ActiveSupport::Deprecation.warn('`allow_include` has been replaced by `default_allow_include_to_one` and `default_allow_include_to_many` options.')
       @default_allow_include_to_one = allow_include