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Editorial Team
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Asked: 2026-05-26T10:59:01+00:00

undefined method `reject’ for 4:String is thrown when I try to perform @user.update_attributes(params). The

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 undefined method `reject' for "4":String

is thrown when I try to perform @user.update_attributes(params).

The params list is as follows

"user"=>{"login"=>"admin", "first_name"=>"Admin", "last_name"=>"Admin", "email"=>"nfsurveytest+admin@neurofocus.com", "location_id"=>"1", "last_login_at_text"=>"Never logged in", "password"=>"", "password_confirmation"=>"", "role_ids"=>"4", "active"=>"true", "is_staff"=>"true"},

The error stack is as below

/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14   /lib/active_record/associations.rb:1336:in block in collection_accessor_methods'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2918:inblock in assign_attributes'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2914:in each'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2914:inassign_attributes'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/li b/active_record/base.rb:2787:in attributes='
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2671:inupdate_attributes_inside_transaction'
 /home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/transactions.rb:229:in block in with_transaction_returning_status'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/database_statements.rb:136:intransaction'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/transactions.rb:182:in transaction'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/transactions.rb:228:inwith_transaction_returning_status'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2667:in update_attributes'
/home/narendra/workspace/nf_schedule/app/controllers/users_controller.rb:100:inupdate'

I assume this breaks as String in ruby 1.9.2 does not mixin ‘Enumerable’.
Can anyone confirm if this is an issue or I am missing something?

https://github.com/rails/rails/issues/3434

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1 Answer

  1. Editorial Team

    You’re supplying a String where ActiveRecord is expecting an Array. You could remap the offending parameter in the controller using something like this:

    if (params[:user])
  params[:user][:role_ids] = [ params[:user][:role_ids] ]
end

    You could also adjust your form so that the field is named role_ids[] instead of just role_ids so that it will be submitted as an array.

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