我不知道财产和所有者之间的关系是否有效，当我尝试查询时出现此错误：
Loading development environment (Rails 3.2.13)
irb(main):001:0> Owner.find(1).properties
Owner Load (18.1ms) SELECT "owners".* FROM "owners" WHERE "owners"."id" = ? LIMIT 1 [["id", 1]]
Property Load (0.1ms) SELECT "properties".* FROM "properties" WHERE "properties"."owner_id" = 1
ActiveRecord::SubclassNotFound: The single-table inheritance mechanism failed to locate the subclass: 'House'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite Property.inheritance_column to use another column for that information.
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/inheritance.rb:143:in `rescue in find_sti_class'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/inheritance.rb:136:in `find_sti_class'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/inheritance.rb:62:in `instantiate'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/querying.rb:38:in `block (2 levels) in find_by_sql'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/querying.rb:38:in `collect!'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/querying.rb:38:in `block in find_by_sql'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/explain.rb:41:in `logging_query_plan'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/querying.rb:37:in `find_by_sql'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/relation.rb:171:in `exec_queries'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/relation.rb:160:in `block in to_a'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/explain.rb:34:in `logging_query_plan'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/relation.rb:159:in `to_a'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/relation/finder_methods.rb:159:in `all'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/associations/collection_association.rb:382:in `find_target'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/associations/collection_association.rb:335:in `load_target'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/associations/collection_proxy.rb:44:in `load_target'
from /var/lib/gems/1.9.2/gems/activerecord-3.2.13/lib/active_record/associations/collection_proxy.rb:87:in `method_missing'
from /var/lib/gems/1.9.2/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
from /var/lib/gems/1.9.2/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
from /var/lib/gems/1.9.2/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
我的 property.rb 文件：
class Property < ActiveRecord::Base
attr_accessible :owner_id, :p_city, :p_street, :postcode, :rent, :rooms, :type
belongs_to :owner
has_one :ticket
end
我的 owner.rb 文件：
class Owner < ActiveRecord::Base
attr_accessible :address, :f_name, :l_name, :tel_no
has_many :properties
end