如何跳過會話創建？

Question

當nil用戶點擊「註冊」，他鼓勵被記錄在之前提交一個目標，習慣和價值

但他可以通過點擊跳過這些形式之一：

的問題是，如果他跳過一個形式，現在則一個錯誤信息彈出：

TypeError in UsersController#create 
no implicit conversion of nil into String 

在這個例子中，我跳過了習慣的形式，因此正在對上調

users_controller

def create 
    @user = User.new(user_params) 
    if @user.save 
     # Goals 
     name = session.delete(:goal_name) 
     deadline = session.delete(:goal_deadline) 
     # Values 
     vname = session.delete(:valuation_name) 
     vimage = session.delete(:valuation_image) 
     # Habits 
     date_started = session.delete(:habit_date_started) 
     committed = session.delete(:habit_committed) 
     trigger = session.delete(:habit_trigger) 
     action = session.delete(:habit_action) 
     target = session.delete(:habit_target) 
     reward = session.delete(:habit_reward) 
     missed_days = session.delete(:habit_missed_days) 
     # Create 
     @user.habits.create(date_started: Date.parse(date_started), committed: committed, trigger: trigger, action: action, target: target, reward: reward, missed_days: missed_days).create_with_current_level 
     @user.goals.create(name: name, deadline: deadline) 
     @user.valuations.create(name: vname, image: vimage) 
     @user.send_activation_email 
     redirect_to root_url 
    else 
     render 'new' 
    end 
    end 

我們如何才能讓用戶跳過？我一直試圖包括各種if/else陳述，但我很難設置正確的方法來觸發條件。

Answer 1

我打算假設他們提交表單時所有的值都被填充。這就是說：

users_controller

def create 
    @user = User.new(user_params) 
    make_habit = false 
    make_goal = false 
    make_valuation = false 

    if @user.save 
     # Goals 
     name = session.delete(:goal_name) 
     deadline = session.delete(:goal_deadline) 
     make_goal = true if !name.blank? && !deadline.blank? 

     # Values 
     vname = session.delete(:valuation_name) 
     vimage = session.delete(:valuation_image) 
     make_valuation = true if !vname.blank? && !vimage.blank? 

     # Habits 
     date_started = session.delete(:habit_date_started) 
     committed = session.delete(:habit_committed) 
     trigger = session.delete(:habit_trigger) 
     action = session.delete(:habit_action) 
     target = session.delete(:habit_target) 
     reward = session.delete(:habit_reward) 
     missed_days = session.delete(:habit_missed_days) 
     make_habit = true if !date_started.blank? && !committed.blank? #(... continue for whatever else you want to make sure is there) 

     # Create 
     @user.habits.create(date_started: Date.parse(date_started), committed: committed, trigger: trigger, action: action, target: target, reward: reward, missed_days: missed_days).create_with_current_level if make_habit 
     @user.goals.create(name: name, deadline: deadline) if make_goal 
     @user.valuations.create(name: vname, image: vimage) if make_valuation 
     @user.send_activation_email 
     redirect_to root_url 
    else 
     render 'new' 
    end 
    end