CODEWITHSUNDEEP
pythonflask
Tychkin Nikitovich
Tychkin Nikitovich

Reputation: 55

How do I fix an endpoint error with flask blueprints

I am learning flask with blueprints and I have the following code example:

from flask import Flask, render_template, Blueprint, g

bp = Blueprint('language', __name__, url_prefix='/<int:language_id>', static_folder='static')
app = Flask(__name__)


@bp.url_defaults
def add_language_id(endpoint, values):
    if 'language_id' in g:
        values.setdefault('language_id', g.site_id)
    else:
        g.language_id = 1  # English


@bp.url_value_preprocessor
def pull_language_id(endpoint, values):
    g.language_id = values.pop('language_id')


@bp.route('/')
def index():
    return render_template('main.html')


@bp.route('/lang')
def language():
    return render_template('lang.html')

app.register_blueprint(bp)

if __name__ == '__main__':
    app.run()

But I'm getting this error:

werkzeug.routing.BuildError: Could not build url for endpoint 'language' with values ['language_id']. Did you mean 'language.index' instead?

Here is the HTML code:

<ul>
    <li>
        <a href="{{ url_for('language', language_id=1) }}">English</a>
    </li>
</ul>

How do I correct this error?

Upvotes: 1

Views: 1224

Answers (1)

CodeLikeBeaker
CodeLikeBeaker

Reputation: 21312

Looks like you are missing the Blueprint name (language) in your url link:

From here:

bp = Blueprint('language', __name__, url_prefix='/<int:language_id>', static_folder='static')

So your link will need to be appended:

<a href="{{ url_for('language.language', language_id=1) }}">English</a>

I would also suggest naming it something different so it doesn't conflict with any other naming convention you might have.

Upvotes: 3

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