Ukazka Journeyapp.net

task.rb

class Task < ActiveRecord::Base
  attr_accessible :title, :description, :tag_ids

  validates_presence_of :title, :description

  has_many :solutions, dependent: :destroy
  has_many :users, through: :solutions

  has_many :taggings
  has_many :tags, through: :taggings

  belongs_to :next_step, class_name: "Task"
  has_one :previous_step, class_name: "Task", foreign_key: "next_step_id"

  # nasledujici dve metody se pouzivaji pouze pro zjisteni, zda u instance ukolu na kteoru je metoda solved_by volana
  # ma uzivatel splnene solution - jinymi slovy, jestli ukol uz vyresil. 
  def solution_for(user)
    solutions.where(user_id: user.id).first
  end

  def solved_by?(user)
    !!solution_for(user)
  end

  # vraci pouze mozne ukoly pro uzivatele (ne ty, ktere jiz ma vyresene)
  # nebo ty u kterych jeste nema vyreseny predchazejici krok - task.previous_step
  def self.available_for(user)
    Task.all.reject do |task|
      task.solved_by?(user) || (task.previous_step && !task.previous_step.solved_by?(user))
    end
  end

end

tasks_controller.rb

class TasksController < AdminController
  def index
    @tasks = Task.all
  end

  def show
    @task = Task.find(params[:id])
  end

  def new
    @task = Task.new
  end

  def create
    @task = Task.new(params[:task])

    if @task.save
      redirect_to tasks_path, notice: "Task was added."
    else
      render :new
    end
  end

  def edit
    @task = Task.find(params[:id])
  end

  def update
    @task = Task.find(params[:id])
    @task.update_attributes(params[:task])
    @task.save!
    redirect_to tasks_path
  end
end