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Rails Admin with more than 100 records showing on drop down list

rails_admin.rb
1)RailsAdmin.config do |config|
  config.model 'User'  do
  field :user_id, :enum do
   enum_mehod do :all_users end
    end
  end
end
2)In user.rb model
def all_users
   User.all.map{[|x|x.id,x.name]}
end

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