ruby on rails - Listing user gender options in a view -

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i seeking populate select list in form options user gender. have learning rails book uses similar approach credit card options creating array in model , referencing in view. unfortunayely when use approach receive error referencing line in view stating: "uninitialized constant gender_options"

class user < activerecord::base   # include default devise modules. others available are:   # :confirmable, :lockable, :timeoutable , :omniauthable   devise :database_authenticatable, :registerable, :confirmable,          :recoverable, :rememberable, :trackable, :validatable    gender_options = { "male" => :true, "female" => :false, "unspecified" => :nil}    has_many :discussions   has_many :comments end   <div>   <%= f.label :gender %><br />   <%= f.select :gender, user::gender_options​ %> </div>

try using helper , locale.

# app/helpers/application_helper.rb  def gender_lists    i18n.t(:gender_lists).map { |key, value| [ value, key ] }  end   # config/locale/en.yml  en:   gender_lists:       "": unspecified       "true": male       "false": female

and on view, can this

<div>   <%= f.label :gender %><br />   <%= f.select :gender, gender_lists​ %> </div>

===

note :

just suggestion, user string type data instead of boolean


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