Ruby on Rails

 should end with a { :include_blanks => false } not with a 'None' string value.

The other thing here is, if an annotation of your models look something like this:

# Table name: entities
#
#  id                       :integer         not null, primary key
#  type_id               :integer
.
.
.
#  created_at         :datetime
#  updated_at         :datetime

# Table name: entity_types
#
#  id                   :integer         not null, primary key
#  type               :string(255)
.
.
.
#  created_at         :datetime
#  updated_at         :datetime

Then in my understanding rails make the relationship between the two models if you have a field name containing the name of the table you want link to followed by an underscore and the name of the primary key of the referred table: i.e. enty model needs an entity_type_id field not type_id.

Well I guess that all I can see from what you have provided but like I said I am not an expert and I stand to be corrected. Hope this helps


Regards,
Tsega