Hi,
I've set up a model as follows
class EquipmentPrice < ActiveRecord::Base
acts_as_tree :order => "id"
...
end
which has the following db migration
class CreateEquipmentPrices < ActiveRecord::Migration
def self.up
create_table :equipment_prices do |t|
t.integer :id
t.string :manufacturer
t.string :model
t.string :equipment_type
t.integer :capacity
t.integer :string_size
t.string :cost_structure
t.string :currency
t.decimal :price_each
t.decimal :price_bulk
t.integer :bulk_quantity
t.integer :parent_id
t.timestamps
end
end
def self.down
drop_table :equipment_prices
end
end
But when I try and run the default test, I get an error message
stating
ActiveRecord::StatementInvalid: Mysql::Error: Duplicate entry '1' for
key 1: INSERT INTO `equipment_prices` (`id`, `manufacturer`, `model`,
`equipment_type`, `capacity`, `string_size`, `cost_structure`,
`currency`, `price_each`, `price_bulk`, `bulk_quantity`, `parent_id`,
`created_at`, `updated_at`) VALUES (1, NULL, NULL, 'PV_subsystem',
NULL, NULL, NULL, 'USD', 0.0, 0.0, 1, 0, '2010-03-11 12:14:05',
'2010-03-11 12:14:05')
I have read in an earlier post that this is because I have parent_id
set as the primary key for the table. But when I look at the mysql
table definition I see
