# routes

resources :projects do
    member do
      patch :complete
      patch :cancel
    end
    resources :tasks do
      member do
        patch :complete
        patch :cancel
      end
      resources :comments
    end
end



# User model

has_many :projects
has_many :tasks
has_many :comments


# Project model

belongs_to :user

# Task model

belongs_to :user


# Comments model

belongs_to :user



# projects_controller

@project = current_user.projects.new(project_params)
@project.save



# tasks_controller

@project = Project.find(params[:project_id])
@task = @project.tasks.new(task_params)
@task.user = current_user
@task.save



# comments_controller

@project = Project.find(params[:project_id])
@task = Task.find(params[:task_id])
@comment = @task.comments.new(comment_params)
@comment.user = current_user
@comment.save