{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "32f1b860",
   "metadata": {},
   "source": [
    "# 22-30 · flash() i session\n",
    "\n",
    "Praktyka do sekcji [„Cookie i sesje: stan między HTTP- żądaniami”"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0a14a1c6",
   "metadata": {},
   "source": [
    "## Cel\n",
    "\n",
    "Zobaczyć, że wiadomość flash()- pojawia się na następnej stronie dokładnie jeden raz, a potem znika."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9e088ca7",
   "metadata": {},
   "source": [
    "## Sprawa robocza"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "152276c5",
   "metadata": {},
   "outputs": [],
   "source": [
    "from flask import Flask, flash, get_flashed_messages, redirect, url_for\n",
    "\n",
    "app = Flask(__name__)\n",
    "app.config[\"SECRET_KEY\"] = \"dev-only-secret-do-not-use-in-production\"\n",
    "\n",
    "\n",
    "@app.route(\"/deystvie\")\n",
    "def deystvie():\n",
    "    flash(\"Что-то произошло!\")\n",
    "    return redirect(url_for(\"stranica\"))\n",
    "\n",
    "\n",
    "@app.route(\"/stranica\")\n",
    "def stranica():\n",
    "    soobshcheniya = get_flashed_messages()\n",
    "    return f\"Сообщений: {len(soobshcheniya)}; {soobshcheniya}\"\n",
    "\n",
    "\n",
    "client = app.test_client()\n",
    "client.get(\"/deystvie\")\n",
    "otvet1 = client.get(\"/stranica\")\n",
    "otvet2 = client.get(\"/stranica\")\n",
    "\n",
    "print(\"Первый визит:\", otvet1.get_data(as_text=True))\n",
    "print(\"Второй визит:\", otvet2.get_data(as_text=True))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b27e7730",
   "metadata": {},
   "source": [
    "## Sprawdzenie wyniku"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e7e00247",
   "metadata": {},
   "outputs": [],
   "source": [
    "assert \"Что-то произошло!\" in otvet1.get_data(as_text=True)\n",
    "assert \"Сообщений: 0\" in otvet2.get_data(as_text=True)\n",
    "print(\"Верно: flash-сообщение показано один раз и не появляется на следующем запросе снова.\")"
   ]
  }
 ],
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