From c3385ab43076ef55aea0ce29ef81f658f625f7a0 Mon Sep 17 00:00:00 2001
From: tmeissner <programming@goodcleanfun.de>
Date: Mon, 15 Oct 2018 22:35:29 +0200
Subject: [PATCH] Chapter 4: Message flashing (4c)

---
 hello.py            | 5 ++++-
 templates/base.html | 6 ++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/hello.py b/hello.py
index d54828d..49a7dc2 100644
--- a/hello.py
+++ b/hello.py
@@ -1,4 +1,4 @@
-from flask import Flask, render_template, session, redirect, url_for
+from flask import Flask, render_template, session, redirect, url_for, flash
 from flask_bootstrap import Bootstrap
 from flask_moment import Moment
 from flask_wtf import FlaskForm
@@ -32,6 +32,9 @@ def internal_server_error(e):
 def index():
     form = NameForm()
     if form.validate_on_submit():
+        old_name = session.get('name')
+        if old_name is not None and old_name != form.name.data:
+            flash('Loks like you have changed your name!')
         session['name'] = form.name.data
         return redirect(url_for('index'))
     return render_template('index.html', form=form, name=session.get('name'))
diff --git a/templates/base.html b/templates/base.html
index 34ad57a..3a8525d 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -32,6 +32,12 @@
 
 {% block content %}
 <div class="container">
+    {% for message in get_flashed_messages() %}
+    <div class="alert alert-warning">
+        <button type="button" class="close" data-dismiss="alert">&times;</button>
+        {{ message }}
+    </div>
+    {% endfor %}
     {% block page_content %}{% endblock %}
 </div>
 {% endblock %}