huginn/app/controllers/admin/users_controller.rb

class Admin::UsersController < ApplicationController
  before_action :authenticate_admin!

  before_action :find_user, only: [:edit, :destroy, :update, :deactivate, :activate]

  helper_method :resource

  def index
    @users = User.reorder('created_at DESC').page(params[:page])

    respond_to do |format|
      format.html
      format.json { render json: @users }
    end
  end

  def new
    @user = User.new
  end

  def create
    admin = params[:user].delete(:admin)
    @user = User.new(params[:user])
    @user.requires_no_invitation_code!
    @user.admin = admin

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

  def edit
  end

  def update
    admin = params[:user].delete(:admin)
    params[:user].except!(:password, :password_confirmation) if params[:user][:password].blank?
    @user.assign_attributes(params[:user])
    @user.admin = admin

    respond_to do |format|
      if @user.save
        format.html { redirect_to admin_users_path, notice: "User '#{@user.username}' was successfully updated." }
        format.json { render json: @user, status: :ok, location: admin_users_path(@user) }
      else
        format.html { render action: 'edit' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @user.destroy

    respond_to do |format|
      format.html { redirect_to admin_users_path, notice: "User '#{@user.username}' was deleted." }
      format.json { head :no_content }
    end
  end

  def deactivate
    @user.deactivate!

    respond_to do |format|
      format.html { redirect_to admin_users_path, notice: "User '#{@user.username}' was deactivated." }
      format.json { render json: @user, status: :ok, location: admin_users_path(@user) }
    end
  end

  def activate
    @user.activate!

    respond_to do |format|
      format.html { redirect_to admin_users_path, notice: "User '#{@user.username}' was activated." }
      format.json { render json: @user, status: :ok, location: admin_users_path(@user) }
    end
  end

  private

  def find_user
    @user = User.find(params[:id])
  end

  def resource
    @user
  end
end