evodata/app/controllers/users_controller.rb

class UsersController < ApplicationController
  before_action :set_user, only: %i[show edit update destroy]

  # GET /users or /users.json
  def index
    authorize User
    # @users = policy_scope(User)
    @users = User.all
  end

  # GET /users/1 or /users/1.json
  def show
    authorize @user
  end

  # GET /users/new
  def new
    @user = User.new
  end

  # GET /users/1/edit
  def edit
    authorize @user
  end

  # POST /users or /users.json
  def create
    @user = User.new(user_params)

    authorize @user

    respond_to do |format|
      if @user.save
        format.html { redirect_to user_url(@user), notice: "User was successfully created." }
        format.json { render :show, status: :created, location: @user }
      else
        format.html { render :new, status: :unprocessable_entity }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /users/1 or /users/1.json
  def update
    authorize @user

    respond_to do |format|
      if @user.update(user_params)
        if @user.unconfirmed? && params.fetch(:user, {}).fetch(:confirm, "0") == "1"
          @user.confirm!
        end
        format.html { redirect_to user_url(@user), notice: "User was successfully updated." }
        format.json { render :show, status: :ok, location: @user }
      else
        format.html { render :edit, status: :unprocessable_entity }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /users/1 or /users/1.json
  def destroy
    @user.destroy

    authorize @user

    respond_to do |format|
      format.html { redirect_to users_url, notice: "User was successfully destroyed." }
      format.json { head :no_content }
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_user
    @user = User.find(params[:id])
  end

  # Only allow a list of trusted parameters through.
  def user_params
    params.require(:user).permit(:name, :email, :admin)
  end
end