active record with ruby (not rails) - ruby

Question

I am using active record with ruby (but not rails). I am using sqlite3 which has a test.db on file (not just in-memory). When I run the following code snippet using user.create, it complains about argument error (and when I use use.save, it throws an active record exception. Any idea what I might be doing wrong? Thanks
require 'rubygems'
gem 'activerecord'
require 'sqlite3'
require 'active_record'
ActiveRecord::Base.logger = Logger.new(STDERR)
#ActiveRecord::Base.colorize_logging = false
ActiveRecord::Base.establish_connection(
:adapter => 'sqlite3',
:host => "localhost",
:database => 'test.db'
)
class User < ActiveRecord::Base
#attr_accessible :email, :full_name
attr_accessor :email
attr_accessor :full_name
validates :email, presence: true, uniqueness: true
def initialize(email, full_name)
#email = email
#full_name = full_name
end
end
puts "full_name for user:"
full_name = gets.chomp
puts "email address:"
email = gets.chomp
user = User.new(email, full_name)
#user.save
user = User.create!(email: '', full_name: '')
Exception in first case (with User.create!):
main.rb:42:in `initialize': wrong number of arguments (1 for 2) (ArgumentError)
from /var/lib/gems/1.9.1/gems/activerecord-4.2.4/lib/active_record/inheritance.rb:61:in `new'
from /var/lib/gems/1.9.1/gems/activerecord-4.2.4/lib/active_record/inheritance.rb:61:in `new'
from /var/lib/gems/1.9.1/gems/activerecord-4.2.4/lib/active_record/persistence.rb:50:in `create!'
from main.rb:55:in `<main>'

Answer 1

It is complaining about the new method. According to the documentation: (http://api.rubyonrails.org/classes/ActiveRecord/Base.html), you don't need the initialize, because when you inherit from ActiveRecord::Base, you need to initialize your objects with a hash.
user = User.new({email: email, full_name: full_name})
# or
user = User.new(email: email, full_name: full_name)
# then
user.save
You need to drop the initialize and the attr_accessor from your code.

Answer 2

Try to comment User#initialize method and create new user like this:
User.create! email: 'halk#mail.com', full_name: 'Halk'
Explanation
When you declare AR model by heritage from ActiveRecord::Base class you don't need to define your own #initialize method. But you do. When you call User::create! method, you pass only one argument - Hash with two pairs (with email and full_name keys). But User#initialize define two parameters - email and full_name separately. So Ruby exception raise and talk about it:
wrong number of arguments (1 for 2) (ArgumentError)