Question

我正在创建一个习惯跟踪应用。

当用户养成习惯时，他会将:date_started放入其中:committed以及:committed做习惯。

然后，在:levels天的X量后，习惯移动到下面的date_started，直到最终达到“掌握”（等级中的天数在模型中被分解下文）。

我已经发现了:levels。

现在我们怎样才能使用承诺的日子而不是任何一天来计算习惯的等级？

:levels是一种动态getter方法，目前对数据库没有任何影响。

我被告知在保存记录之前我需要一个适当的回调来设置<%= f.label "Committed to:" %>  <%= f.collection_check_boxes :committed, Date::DAYNAMES, :downcase, :to_s %>属性，但我不知道如何。

你会接受这个挑战吗？

形式

class Habit < ActiveRecord::Base
	belongs_to :user
	validates :action, presence: true
	serialize :committed, Array

	scope :missed, -> { where(missed: 1) }
	scope :nonmissed, -> { where(missed: 0) }

	def levels
	  committed_wdays = committed.map { |day| Date::DAYNAMES.index(day) }
		n_days = (date_started..Date.today).count { |date| committed_wdays.include? date.wday }

  case n_days	  
	  when 0..9
	    1
	  when 10..24
	    2
	  when 25..44
	    3
	  when 45..69
	    4
	  when 70..99
	    5
	  else
	    "Mastery"
		end
	end
end

class HabitsController < ApplicationController
  before_action :set_habit, only: [:show, :edit, :update, :destroy]
  before_action :correct_user, only: [:edit, :update, :destroy]
  before_action :authenticate_user!, except: [:index, :show]

  def index
   @habits = Habit.all.order("date_started DESC")
   @missed_habits = current_user.habits.missed
   @nonmissed_habits = current_user.habits.nonmissed
  end

  def show
  end

  def new
    @habit = current_user.habits.build
  end

  def edit
  end

  def create
    @habit = current_user.habits.build(habit_params)
    if @habit.save
      redirect_to @habit, notice: 'Habit was successfully created.'
    else
      render action: 'new'
    end
  end

  def update
    if @habit.update(habit_params)
      redirect_to @habit, notice: 'Habit was successfully updated.'
    else
      render action: 'edit'
    end
  end

  def destroy
    @habit.destroy
    redirect_to habits_url
  end

  private
    def set_habit
      @habit = Habit.find(params[:id])
    end

    def correct_user
      @habit = current_user.habits.find_by(id: params[:id])
      redirect_to habits_path, notice: "Not authorized to edit this habit" if @habit.nil?
    end

    def habit_params
      params.require(:habit).permit(:missed, :left, :level, :date_started, :trigger, :action, :target, :positive, :negative, :committed => [])
    end
end

控制器

{{1}}

Github ：https://github.com/RallyWithGalli/ruletoday

提前感谢您的专业知识=]

如何使用回调设置：级别值？

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