Undefined method `debug' for nil:NilClass(NoMethodError

ruby-talk
1

I created very simple AR code to add new record to MySQL table. But I
get " undefined method `debug' for nil:NilClass(NoMethodError)".

Here is the code:

···

======================================
require 'rubygems'
require 'active_record'

ActiveRecord::Base.establish_connection(
:adapter => "mysql",
:host => "localhost",
:user => "root",
:password => "samplepass",
:database => "db_demo"
)

class City < ActiveRecord::Base
end

City.create(:id => 4, :name => 'Washington')

last_city = City.find(:last)

if last_city
  puts %{#{last_city.name} is the last city}
else
  puts "There is no any City."
end

The code is so simple just like explained in
(http://rubylearning.com/satishtalim/ruby_activerecord_and_mysql.html)
and in the Ruby AR documentation. But that undefined method error pops
up anyway. I actually, so many developers encounter the same problem.
Still cannot find the solution.

Any suggestion is appreciated.
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2

Esen Sagynov wrote:

I created very simple AR code to add new record to MySQL table. But I
get " undefined method `debug' for nil:NilClass(NoMethodError)".

I think you need to show the full backtrace. This will show not only
which line in your sample program triggered the error, but also in which
library it occurred.

Also describe your platform: which operating system and version? Which
version of ruby, and where did you install it from? Which version of
active_record? Which version of mysql client library?

···

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3

Esen Sagynov wrote in post #930294:

I created very simple AR code to add new record to MySQL table. But I
get " undefined method `debug' for nil:NilClass(NoMethodError)".

Here is the code:

require 'rubygems'
require 'active_record'

ActiveRecord::Base.establish_connection(
:adapter => "mysql",
:host => "localhost",
:user => "root",
:password => "samplepass",
:database => "db_demo"
)

class City < ActiveRecord::Base
end

City.create(:id => 4, :name => 'Washington')

Hi,
  Have you solved this problem. Me also having same error.
I don't get any error unless I manually input primary id

Working code
City.create(:name => 'Washington')

Error code
City.create(id=> 1 ,:name => 'Washington')

RubyVersion: 1.8.1
Rails Version: 2.2.2
Gem Version: 1.3.2

Thanks in Advance

···

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