Remove usage of marshal_dump since this was removed from Rails

lib/awesome_print/ext/active_record.rb

@@ -81,21 +81,12 @@ def awesome_active_model_error(object)
       return object.inspect if !defined?(::ActiveSupport::OrderedHash)
       return awesome_object(object) if @options[:raw]
 
-      object_dump = object.marshal_dump.first
-      data = if object_dump.class.column_names != object_dump.attributes.keys
-               object_dump.attributes
-             else
-               object_dump.class.column_names.inject(::ActiveSupport::OrderedHash.new) do |hash, name|
-                 if object_dump.has_attribute?(name) || object_dump.new_record?
-                   value = object_dump.respond_to?(name) ? object_dump.send(name) : object_dump.read_attribute(name)
-                   hash[name.to_sym] = value
-                 end
-                 hash
-               end
-             end
+      data = object.instance_variable_get('@base')
+                   .attributes
+                   .merge(details: object.details.to_h,
+                          messages: object.messages.to_h.transform_values(&:to_a))
 
-      data.merge!({details: object.details, messages: object.messages})
-      "#{object} #{awesome_hash(data)}"
+      [object.to_s, awesome_hash(data)].join(' ')
     end
   end
 end

spec/active_record_helper.rb

@@ -24,7 +24,7 @@ def self.env
   end
 
   # Create models
-  class User < ActiveRecord::Base; has_many :emails; end
+  class User < ActiveRecord::Base; validates :name, presence: true; has_many :emails; end
   class SubUser < User; end
   class Email < ActiveRecord::Base; belongs_to :user; end
 end

spec/ext/active_record_spec.rb

@@ -116,6 +116,19 @@
       @ap = AwesomePrint::Inspector.new(plain: true, sort_keys: true, raw: true)
     end
 
+    context 'when validations errors' do
+      before do
+        @ap = AwesomePrint::Inspector.new(plain: true, sort_keys: true, raw: false)
+      end
+
+      it 'with validation errors' do
+        @diana.name = nil
+        @diana.valid?
+        out = @ap.awesome(@diana.errors)
+        expect(out).to match("can't be blank")
+      end
+    end
+
     it 'display single record' do
       out = @ap.awesome(@diana)
 
@@ -257,4 +270,3 @@ class SubUser < User {
     end
   end
 end
-