ruby on rails - Invalid date with Date.parse -

before user signs require him create challenge.

this challenges_controller:

def create   @challenge = challenge.new(challenge_params)   if current_user == nil     session[:challenge_action] = challenge_params[:action]     session[:challenge_deadline] = [params["challenge"]["deadline(3i)"], params["challenge"]["deadline(2i)"], params["challenge"]["deadline(1i)"]].join('/')     redirect_to signup_path   end end 

the parameters passed through:

  parameters: {"challenge"=>{"action"=>"run", "deadline"=>"2016-02-29"}, "button"=>""} 

the action , deadline parameters passed can see above. once new user created new challenge not created:

argumenterror (invalid date):   app/controllers/users_controller.rb:33:in `parse'   app/controllers/users_controller.rb:33:in `create' 

this users_controller:

  def create     @user = user.new(user_params)     if @user.save       action = session.delete(:challenge_action)       deadline = session.delete(:challenge_deadline)       # create       if deadline.present?         @user.challenges.create(           action: action,             deadline: date.parse(deadline), #focus of question         )       end       log_in @user       redirect_to root_url   end 

now if change deadline: date.parse(deadline) deadline: deadline challenge created upon creating new user, deadline isn't saved reason:

pry(main)> challenge.last  id: 1,  action: "code",  deadline: nil,> 

the challenge object won't save invalid deadline value. use text_field date, use value option.

<%= f.text_field :deadline, value: @challenge.deadline.strftime("%d-%m-%y") %> 

there date_field returns text field of type date. default value generated trying call strftime("%y-%m-%d") on objects value. able override strftime("%y-%m-%d") explicitly passing value option (like above).