[#659 state:resolved] table_exists? repeatedly queries the DB

hobofields/lib/hobo_fields/model_extensions.rb

@@ -208,7 +208,7 @@ def self.attr_type(name)
 
     # Return the entry from #columns for the named column
     def self.column(name)
-      return unless table_exists?
+      return unless (@table_exists ||= table_exists?)
       name = name.to_s
       columns.find {|c| c.name == name }
     end