ActiveRecord STI delete doesn't work correctly - ruby

Question

I want to store two models using active record, but delete doesn't work as expected.
Evaluation has id, name and description
and SqlEvaluation has additional two columns of query_string and database.
I want to use those two tables, and eval_typ_id is used to distinguish which subclass should be used: 1 for SqlEvaluation.
create table eval (
eval_id int,
eval_name varchar,
eval_desc varchar,
eval_typ_id int
);
create table sql_eval (
eval_id int
query_str varchar
database varchar
);
After some research, I used the following code, it works well except "delete", which didn't delete the row in sql_eval. I cannot figure out where is wrong?
require 'rubygems'
require 'active_record'
require 'logger'
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.establish_connection(:adapter => "ibm_db",
:username => "edwdq",
:password => "edw%2dqr",
:database => "EDWV2",
:schema => "EDWDQ" )
class Eval < ActiveRecord::Base
set_table_name "eval"
set_primary_key :eval_id
TYPE_MAP = { 1 => 'SqlEval' }
class << self
def find_sti_class(type)
puts "#{type}"
super(TYPE_MAP[type.to_i])
end
def sti_name
TYPE_MAP.invert[self.name]
end
end
set_inheritance_column :eval_typ_id
end
class SqlEval < Eval
has_one :details, :class_name=>'SqlEvalDetails', :primary_key=>:eval_id, :foreign_key=>:eval_id, :include=>true, :dependent=>:delete
default_scope :conditions => { :eval_typ_id => 1 }
end
class SqlEvalDetails < ActiveRecord::Base
belongs_to :sql_eval, :class_name=>'SqlEval',
:conditions => { :eval_type_id => 1 }
set_table_name "sql_eval"
set_primary_key :eval_id
end
se = SqlEval.find(:last)
require 'pp'
pp se
pp se.details
# Eval.delete(se.eval_id)
se.delete

Answer 1

Sorry for messing the code. It is first time to post for me. Here is the code.
require 'rubygems'
require 'active_record'
require 'logger'
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.establish_connection(:adapter => "ibm_db",
:username => "edwdq",
:password => "edw%2dqr",
:database => "EDWV2",
:schema => "EDWDQ" )
class Eval < ActiveRecord::Base
set_table_name "eval"
set_primary_key :eval_id
TYPE_MAP = { 1 => 'SqlEval' }
class << self
def find_sti_class(type)
puts "#{type}"
super(TYPE_MAP[type.to_i])
end
def sti_name
TYPE_MAP.invert[self.name]
end
end
set_inheritance_column :eval_typ_id
end
class SqlEval < Eval
has_one :details, :class_name=>'SqlEvalDetails', :primary_key=>:eval_id, :foreign_key=>:eval_id, :include=>true, :dependent=>:delete
default_scope :conditions => { :eval_typ_id => 1 }
end
class SqlEvalDetails < ActiveRecord::Base
belongs_to :sql_eval, :class_name=>'SqlEval',
:conditions => { :eval_type_id => 1 }
set_table_name "sql_eval"
set_primary_key :eval_id
end
se = SqlEval.find(:last)
e = Eval.where(:eval_id => 26)
require 'pp'
pp se
pp e
pp se.details
# Eval.delete(se.eval_id)
se.delete