FIX #103, changed constantize for safe_constantize

.gitignore

@@ -8,3 +8,5 @@
 /test_app/test
 /test_app/vendor
 Gemfile.lock
+*.swo
+*.swp

lib/impressionist/counter_cache.rb

@@ -1,10 +1,3 @@
-# Note
-# It is only updatable if
-# impressionist_id && impressionist_type(class) are present &&
-# impressionable_class(which is imp_type.constantize) is counter_caching
-# Defined like so
-# is_impressionable :counter_cache => true
-
 module Impressionist
   module CounterCache
 
@@ -12,21 +5,39 @@ module Impressionist
 
     private
 
-      # if updatable returns true, it must be qualified to update_counters
-      # impressionable_class instance var is set when updatable? is called
+      # A valid impression must
+      # have a valid impressionable class
+      # be counter_caching
+      # have a record saved in the db
+      # then it should give it a try
       def impressionable_counter_cache_updatable?
         updatable? && impressionable_try
       end
 
-      # asks imp_id && imp_class whether it's present or not
-      # so that it is updatable
       def updatable?
-        @impressionable_class = impressionable_class_set
-        impressionable_valid?
+        valid_impressionable_class? && impressionable_find
       end
 
-      def impressionable_valid?
-        (self.impressionable_id.present? && impressionable_class)
+      def valid_impressionable_class?
+        set_impressionable_class && counter_caching?
+      end
+
+      def set_impressionable_class
+        klass = self.impressionable_type  || false
+        @impressionable_class = klass.
+          to_s.safe_constantize           || false
+      end
+
+      # default mode is ERROR
+      def impressionist_log(str, mode=:error)
+        Rails.logger.send(mode.to_s, str)
+      end
+
+      # receives an entity(instance of a Model) and then tries to update
+      # counter_cache column
+      # entity is a impressionable instance model
+      def impressionable_try
+        entity.try(:update_impressionist_counter_cache)
       end
 
       def impressionable_find
@@ -37,29 +48,11 @@ module Impressionist
 
       end
 
-      # imps_type == nil, constantize returns Object
-      # It attemps to return false so it won't be updatable
-      # calls to_s otherwise it would try to constantize nil
-      # and it would raise an exeception
-      # Must be !~ Object and be counter_caching to be qualified as updatable
-      def impressionable_class_set
-        klass = self.impressionable_type.to_s.constantize
-        (klass.to_s !~ /Object/) && klass.impressionist_counter_caching? ? klass : false
+      def counter_caching?
+        impressionable_class.
+          impressionist_counter_caching?
       end
 
-      # default mode is ERROR
-      # ruby 1.8.7 support
-      def impressionist_log(str, mode=:error)
-        Rails.logger.send(mode.to_s, str)
-      end
-
-      # receives an entity(instance of a Model) and then tries to update
-      # counter_cache column
-      # entity is a impressionable instance model
-      def impressionable_try
-        impressionable_find
-        entity.try(:update_impressionist_counter_cache)
-      end
 
       # Returns false, as it is only handling one exeception
       # It would make updatable to fail thereafter it would not try

tests/test_app/db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130709003307) do
+ActiveRecord::Schema.define(:version => 20130719024021) do
 
   create_table "articles", :force => true do |t|
     t.string   "name"