plans_controller.rb

class PlansController < ApplicationController
  before_action :init_plan_service
  before_action :find_plan, only: %i(edit update)
  # after_action :check_plan, only: %i(find_plan)

  def index
    @plans = plan_service.filter_plan_list
                         .page(params[:page])
                         .per Settings.pagination.list
  end

  def new
    @plan = plan_service.new_plan
    plan.attachments.build
  end

  def create
    @plan = plan_service.create_resource

    plan.errors.blank? ? plan_create_success : plan_create_fail
  end

  def show
    @plan = Plan.without_deleted
                .plan_viewable(current_user)
                .find_by id: params[:id]
    check_plan
  end

  def edit
    plan.attachments.build unless get_attachments.any?
  end

  def update
    if plan_service.update_resource
      flash[:success] = t "successful_update"
      redirect_to plan
    else
      flash[:danger] = t "failed_update"
      plan.attachments.build unless get_attachments.any?
      render :edit
    end
  end

  private

  attr_reader :plan, :plan_service

  def init_plan_service
    @plan_service = PlanService.new params, current_user
  end

  def plan_params
    params.require(:plan).permit Plan::PARAMS
  end

  def find_plan
    @plan = if current_user.can_view_all_plan?
              Plan.find_by id: param_id
            else
              current_user.plans.find_by id: params[:id]
            end
    check_plan
  end

  def param_id
    params[:id]
  end

  def check_plan
    return if plan
    flash[:warning] = t "not_found"
    redirect_to plans_path
  end

  def plan_create_success
    flash[:success] = t "successful_create"
    redirect_to plan
  end

  def plan_create_fail
    plan.attachments.build unless params[:plan][:attachments_attributes]
    flash[:danger] = t "failed_create"
    render :new
  end

  def get_attachments
    plan.attachments
  end
end