CODEWITHSUNDEEP
ruby-on-rails-4
Colin Wu
Colin Wu

Reputation: 699

Getting "undefined method `[]' for nil:NilClass" when creating record

I am porting an old Rails 3 application to Rails 4.0.15 and everything seems to be going fine except that whenever I try to create a record (even in Rails console) I am getting the above error (undefined method '[]' for nil:NilClass).

I am over-simplifying things a little here but what I did was to create a new app (rails new xxxx) then copy the app/ and db/ tree over from the old. I used the same db. routes.rb and Gemfile were adjusted manually.

One of the models is Contact:

class Contact < ActiveRecord::Base
  attr_accessible :name, :email, :phone, :address
end

In rails console I get the following when I type Contact.create:

Loading development environment (Rails 4.1.5)
irb(main):001:0> Contact.create
NoMethodError: undefined method `[]' for nil:NilClass
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/attribute_methods/read.rb:113:in `block in read_attribute'
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/attribute_methods/read.rb:111:in `fetch'
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/attribute_methods/read.rb:111:in `read_attribute'
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/attribute_methods/primary_key.rb:19:in `id'
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/transactions.rb:344:in `remember_transaction_record_state'
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/transactions.rb:282:in `rollback_active_record_state!'
    from /usr/share/gems/gems/activerecord-4.1.5/lib/active_record/transactions.rb:267:in `save'
    from /home/wucolin/.gem/ruby/gems/protected_attributes-1.0.3/lib/active_record/mass_assignment_security/persistence.rb:46:in `create'
    from (irb):1
    from /usr/share/gems/gems/railties-4.1.5/lib/rails/commands/console.rb:90:in `start'
    from /usr/share/gems/gems/railties-4.1.5/lib/rails/commands/console.rb:9:in `start'
    from /usr/share/gems/gems/railties-4.1.5/lib/rails/commands/commands_tasks.rb:69:in `console'
    from /usr/share/gems/gems/railties-4.1.5/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /usr/share/gems/gems/railties-4.1.5/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:8:in `require'
    from bin/rails:8:in `<main>'

Best case scenario: I'm hoping someone would see this and go "Yeah, that's easy to fix. All you do is..."

However, I would be quite happy if someone could point me in the right direction or where to start.

Thanks all for you time.

Upvotes: 1

Views: 690

Answers (1)

Simone Carletti
Simone Carletti

Reputation: 176562

The "attr_accessible" feature is gone in Rails 4. I suggest to not use the gem, there have been many reports of issues.

Rather than pushing "protected" into Rails 4, install the strong_parameters gem and backport the strong parameters feature in Rails 3.

It is definitely a more appropriate approach.

Upvotes: 1

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