Monkeypatch to fix marshal_dump errors leading awesome_rails_console …

…not to work under conditions like model.errors (see: awesome-print/awesome_print#415)

lib/awesome_print/ext/active_record.rb

@@ -0,0 +1,94 @@
+# Copyright (c) 2010-2016 Michael Dvorkin and contributors
+#
+# Awesome Print is freely distributable under the terms of MIT license.
+# See LICENSE file or http://www.opensource.org/licenses/mit-license.php
+#------------------------------------------------------------------------------
+module AwesomePrint
+  module ActiveRecord
+
+    def self.included(base)
+      base.send :alias_method, :cast_without_active_record, :cast
+      base.send :alias_method, :cast, :cast_with_active_record
+    end
+
+    # Add ActiveRecord class names to the dispatcher pipeline.
+    #------------------------------------------------------------------------------
+    def cast_with_active_record(object, type)
+      cast = cast_without_active_record(object, type)
+      return cast if !defined?(::ActiveRecord::Base)
+
+      if object.is_a?(::ActiveRecord::Base)
+        cast = :active_record_instance
+      elsif object.is_a?(::ActiveModel::Errors)
+        cast = :active_model_error
+      elsif object.is_a?(Class) && object.ancestors.include?(::ActiveRecord::Base)
+        cast = :active_record_class
+      elsif type == :activerecord_relation || object.class.ancestors.include?(::ActiveRecord::Relation)
+        cast = :array
+      end
+      cast
+    end
+
+    private
+
+    # Format ActiveRecord instance object.
+    #
+    # NOTE: by default only instance attributes (i.e. columns) are shown. To format
+    # ActiveRecord instance as regular object showing its instance variables and
+    # accessors use :raw => true option:
+    #
+    # ap record, :raw => true
+    #
+    #------------------------------------------------------------------------------
+    def awesome_active_record_instance(object)
+      return object.inspect if !defined?(::ActiveSupport::OrderedHash)
+      return awesome_object(object) if @options[:raw]
+
+      data = if object.class.column_names != object.attributes.keys
+               object.attributes
+             else
+               object.class.column_names.inject(::ActiveSupport::OrderedHash.new) do |hash, name|
+                 if object.has_attribute?(name) || object.new_record?
+                   value = object.respond_to?(name) ? object.send(name) : object.read_attribute(name)
+                   hash[name.to_sym] = value
+                 end
+                 hash
+               end
+             end
+      "#{object} #{awesome_hash(data)}"
+    end
+
+    # Format ActiveRecord class object.
+    #------------------------------------------------------------------------------
+    def awesome_active_record_class(object)
+      return object.inspect if !defined?(::ActiveSupport::OrderedHash) || !object.respond_to?(:columns) || object.to_s == 'ActiveRecord::Base'
+      return awesome_class(object) if object.respond_to?(:abstract_class?) && object.abstract_class?
+
+      data = object.columns.inject(::ActiveSupport::OrderedHash.new) do |hash, c|
+        hash[c.name.to_sym] = c.type
+        hash
+      end
+
+      name = "class #{awesome_simple(object.to_s, :class)}"
+      base = "< #{awesome_simple(object.superclass.to_s, :class)}"
+
+      [name, base, awesome_hash(data)].join(' ')
+    end
+
+    # Format ActiveModel error object.
+    #------------------------------------------------------------------------------
+    def awesome_active_model_error(object)
+      return object.inspect if !defined?(::ActiveSupport::OrderedHash)
+      return awesome_object(object) if @options[:raw]
+
+      data = object.instance_variable_get('@base')
+                   .attributes
+                   .merge(details: object.details.to_h,
+                          messages: object.messages.to_h.transform_values(&:to_a))
+
+      [object.to_s, awesome_hash(data)].join(' ')
+    end
+  end
+end
+
+AwesomePrint::Formatter.send(:include, AwesomePrint::ActiveRecord)