gistfile1.rb

  def show
    @user = User.find_by(username: params[:id])

    respond_to do |format|
      format.html {     
        render action: 'show' 
      }
      format.json { 
        your_friend = false
        if user_signed_in?
          your_friend = @user.is_friend(current_user) != false
        end

        user = {
          username: @user.username,
          your_friend: your_friend,
          friend_count: @user.friend_count,
          avatar: @user.avatar.url,
          bio: @user.bio
        }
        ActiveSupport::Notifications.instrument('json.render') do
          render json: user
        end
      }
    end    
  end