Fix bug where records can't be added to an originally empty ActiveJSO…

…N datastore

Simple fix would be to replace `@records = nil` with `@records = []`,
but the suggested approach as a better impact on the code base, avoiding
repetitions such as `@records || []`.

lib/active_hash/base.rb

@@ -117,7 +117,7 @@ def data
 
       def data=(array_of_hashes)
         mark_dirty
-        @records = nil
+        records.clear
         reset_record_index
         self._data = array_of_hashes
         if array_of_hashes
@@ -135,13 +135,12 @@ def exists?(record)
       end
 
       def insert(record)
-        @records ||= []
         record[:id] ||= next_id
         validate_unique_id(record) if dirty
         mark_dirty
 
-        add_to_record_index({ record.id.to_s => @records.length })
-        @records << record
+        add_to_record_index({ record.id.to_s => records.length })
+        records << record
       end
 
       def next_id
@@ -153,6 +152,12 @@ def next_id
         end
       end
 
+      def records
+        @records ||= []
+      end
+
+      private :records
+
       def record_index
         @record_index ||= {}
       end
@@ -193,7 +198,7 @@ def create!(attributes = {})
       end
 
       def all(options = {})
-        ActiveHash::Relation.new(self, @records || [], options[:conditions] || {})
+        ActiveHash::Relation.new(self, records, options[:conditions] || {})
       end
 
       delegate :where, :find, :find_by, :find_by!, :find_by_id, :count, :pluck, :pick, :first, :last, :order, to: :all
@@ -211,7 +216,7 @@ def transaction
       def delete_all
         mark_dirty
         reset_record_index
-        @records = []
+        records.clear
       end
 
       def fields(*args)

lib/enum/enum.rb

@@ -21,7 +21,7 @@ def insert(record)
 
       def delete_all
         if @enum_accessors.present?
-          @records.each do |record|
+          records.each do |record|
             constant = constant_for(record, @enum_accessors)
             remove_const(constant) if const_defined?(constant, false)
           end