mongoid/mongoid — Issue #1678: def initialize causes nil error with Mongoid::Document (simple class)
Author: jcollum
Created: 2012-02-05 21:06:34+00:00
State: open

I saw a strange bug today and created a simple class to test it:

```
class Alpha

def initialize
puts 'initialize Alpha'
end
end
```

This class inits fine (Alpha.new). But if I add "include Mongoid::Document" I get this error:

```
>> Alpha.new
initialize Alpha
NoMethodError: You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.[]
from /home/user/.rvm/gems/ruby-1.9.2-p290/gems/mongoid-2.4.3/lib/mongoid/inspection.rb:32:in `block in inspect_fields'
```

Mongoid 2.4.3. The full failing source is:

```
class Alpha
include Mongoid::Document

def initialize
puts 'initialize Alpha'
end
end

```

>> Rails::VERSION::STRING
=> "3.1.1"
>> RUBY_VERSION
=> "1.9.2"

I thought adding a simple field (field :name, type: String) might fix it but didn't change anything.