property unavailable_dates

routes.py

@@ -87,6 +87,13 @@ def create_listing():
 @app.route('/booking/<int:listing_id>', methods=['GET', 'POST'])
 def booking(listing_id):
     listing = Listing.query.get_or_404(listing_id)
+
+    booked_dates = Booking.query.filter_by(listing_id=listing_id).all()
+    unavailable_dates = [
+        (booking.check_in.strftime('%Y-%m-%d'), booking.check_out.strftime('%Y-%m-%d'))
+        for booking in booked_dates
+    ]
+
     if request.method == 'POST':
         guest_name = request.form['name']
         email = request.form['email']
@@ -98,4 +105,4 @@ def booking(listing_id):
         db.session.add(booking)
         db.session.commit()
         return redirect(url_for('home'))
-    return render_template('booking.html', listing=listing)
+    return render_template('booking.html', listing=listing, unavailable_dates=unavailable_dates)