I want to change the “type” field for a table but am getting an error:
read_creatures.rb:19: undefined local variable or method `green_dragon’
I’ve tried both “green_dragon” and the class name “GreenDragon” with
both
giving (different) errors 
thufir@arrakis ~/Desktop/dwemthys $
thufir@arrakis ~/Desktop/dwemthys $ ruby make_creatures.rb
– create_table(:creatures)
SQL (0.023529) CREATE TABLE creatures (“id” INTEGER PRIMARY KEY NOT
NULL, “type” varchar(255) DEFAULT NULL, “life” integer DEFAULT NULL,
“strength” integer DEFAULT NULL, “charisma” integer DEFAULT NULL,
“weapon” integer DEFAULT NULL)
-> 0.1483s
#<Dragon:0xb7747f54 @new_record=true, @attributes={“strength”=>0,
“type”=>“Dragon”, “charisma”=>0, “weapon”=>0, “life”=>0}>
SQL (0.000930) INSERT INTO creatures (“strength”, “type”,
“charisma”,
“life”, “weapon”) VALUES(0, ‘Dragon’, 0, 0, 0)
#<Dragon:0xb773e2ec @new_record=true, @attributes={“strength”=>0,
“type”=>“Dragon”, “charisma”=>0, “weapon”=>0, “life”=>0}>
SQL (0.000742) INSERT INTO creatures (“strength”, “type”,
“charisma”,
“life”, “weapon”) VALUES(0, ‘Dragon’, 0, 0, 0)
#<Dragon:0xb773bb8c @new_record=true, @attributes={“strength”=>0,
“type”=>“Dragon”, “charisma”=>0, “weapon”=>0, “life”=>0}>
SQL (0.000735) INSERT INTO creatures (“strength”, “type”,
“charisma”,
“life”, “weapon”) VALUES(0, ‘Dragon’, 0, 0, 0)
#<Dragon:0xb77394b8 @new_record=true, @attributes={“strength”=>0,
“type”=>“Dragon”, “charisma”=>0, “weapon”=>0, “life”=>0}>
SQL (0.001781) INSERT INTO creatures (“strength”, “type”,
“charisma”,
“life”, “weapon”) VALUES(0, ‘Dragon’, 0, 0, 0)
#<Dragon:0xb7734440 @new_record=true, @attributes={“strength”=>0,
“type”=>“Dragon”, “charisma”=>0, “weapon”=>0, “life”=>0}>
SQL (0.000739) INSERT INTO creatures (“strength”, “type”,
“charisma”,
“life”, “weapon”) VALUES(0, ‘Dragon’, 0, 0, 0)
thufir@arrakis ~/Desktop/dwemthys $
thufir@arrakis ~/Desktop/dwemthys $ ruby read_creatures.rb
Creature Load (0.006906) SELECT * FROM creatures
Dragon Update (0.001537) UPDATE creatures SET “charisma” = 0,
“strength” = 0, “weapon” = 0, “life” = 0, “type” = ‘Dragon’ WHERE “id” =
1
Dragon Update (0.000748) UPDATE creatures SET “charisma” = 0,
“strength” = 0, “weapon” = 0, “life” = 0, “type” = ‘Dragon’ WHERE “id” =
2
Dragon Update (0.000731) UPDATE creatures SET “charisma” = 0,
“strength” = 0, “weapon” = 0, “life” = 0, “type” = ‘Dragon’ WHERE “id” =
3
read_creatures.rb:19: undefined local variable or method green_dragon' for main:Object (NameError) from read_creatures.rb:17:ineach’
from read_creatures.rb:17
thufir@arrakis ~/Desktop/dwemthys $
thufir@arrakis ~/Desktop/dwemthys $ cat read_creatures.rb
require ‘fileutils’
require ‘active_record’
require ‘creature’
require ‘dragon’
require ‘green_dragon’
ActiveRecord::Base.logger = Logger.new(STDERR)
ActiveRecord::Base.colorize_logging = true
ActiveRecord::Base.establish_connection(
:adapter => “sqlite3”,
:dbfile => “dwemthys.db”
)
index = 0
Creature.find(:all).each { |creature|
if (index > 2) then
creature.type = green_dragon
creature.weapon = 1000
end
creature.save
index = index+1
}
Creature.find(:all).each { |creature|
puts creature.inspect
}
thufir@arrakis ~/Desktop/dwemthys $
thanks,
Thufir