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copied!<p>Your going to have to monkey patch the notion of foreign_type into has_one relationship. This is what i did for has_many. In a new .rb file in your initializers folder i called mine add_foreign_type_support.rb It lets you specify what your attachable_type is to be. Example: has_many photo, :class_name => "Picture", :as => attachable, :foreign_type => 'Pic'</p> <pre><code>module ActiveRecord module Associations class HasManyAssociation < AssociationCollection #:nodoc: protected def construct_sql case when @reflection.options[:finder_sql] @finder_sql = interpolate_sql(@reflection.options[:finder_sql]) when @reflection.options[:as] resource_type = @reflection.options[:foreign_type].to_s.camelize || @owner.class.base_class.name.to_s @finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{owner_quoted_id} AND " @finder_sql += "#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(resource_type)}" else @finder_sql += ")" end @finder_sql << " AND (#{conditions})" if conditions else @finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}" @finder_sql << " AND (#{conditions})" if conditions end if @reflection.options[:counter_sql] @counter_sql = interpolate_sql(@reflection.options[:counter_sql]) elsif @reflection.options[:finder_sql] # replace the SELECT clause with COUNT(*), preserving any hints within /* ... */ @reflection.options[:counter_sql] = @reflection.options[:finder_sql].sub(/SELECT (\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" } @counter_sql = interpolate_sql(@reflection.options[:counter_sql]) else @counter_sql = @finder_sql end end end end end # Add foreign_type to options list module ActiveRecord module Associations # :nodoc: module ClassMethods private mattr_accessor :valid_keys_for_has_many_association @@valid_keys_for_has_many_association = [ :class_name, :table_name, :foreign_key, :primary_key, :dependent, :select, :conditions, :include, :order, :group, :having, :limit, :offset, :as, :foreign_type, :through, :source, :source_type, :uniq, :finder_sql, :counter_sql, :before_add, :after_add, :before_remove, :after_remove, :extend, :readonly, :validate, :inverse_of ] end end </code></pre>

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