I’m trying to make a flask site and so far it’s working to print a hello world. When I try and turn from outputting text to outputting a simple html template the site breaks and I get the error below.
This is my code:
from flask import render_template, Blueprint
recipes_blueprint = Blueprint('recipes', __name__, template_folder='templates')
@recipes_blueprint.route('/')
def index():
return
render_template('list.html')
And my list.html is simply the below inside the templates folder:
<h1>Test</h1>
The full error is here:
2021-10-16 07:50:53,399: from app import app as application # noqa
2021-10-16 07:50:53,399:
2021-10-16 07:50:53,399: File "/home/jameshiven/mysite/app.py", line 3, in <module>
2021-10-16 07:50:53,399: from products.views import products_bp
2021-10-16 07:50:53,399:
2021-10-16 07:50:53,399: File "/home/jameshiven/mysite/products/views.py", line 12, in <module>
2021-10-16 07:50:53,399: render_template('list.html')
2021-10-16 07:50:53,399:
2021-10-16 07:50:53,399: File "/usr/local/lib/python3.9/site-packages/flask/templating.py", line 146, in render_template
2021-10-16 07:50:53,399: ctx.app.update_template_context(context)
2021-10-16 07:50:53,400:
Blueprints are supossed to be registered with flask app to be appeared in the app.
Modify your code to
from flask import render_template, Blueprint, Flask
recipes_blueprint = Blueprint('recipes', __name__, template_folder='templates')
app = Flask(__name__)
app.register_blueprint(recipes_blueprint)
@app.route('/')
def index():
return render_template('list.html')
if __name__ == '__main__':
app.run()
You didn't provide the actual exception message, but I'm going to guess it was:
AttributeError: 'NoneType' object has no attribute 'app'
This is because your view function is messed up. Change it to say:
@recipes_blueprint.route('/')
def index():
return render_template('list.html')
Then register your blueprint with the app object like John suggested.