View function mapping is overwriting an existing endpoint function: index

[rarevesselt]

please give a runnable sample of your code with the full error text or a clear description of the problem
This is the error am having:
Traceback (most recent call last):
File "manage.py", line 3, in <module>
from thermos import app, db
File "/Users/MAC/dev/thermos/thermos/__init__.py", line 16, in <module>
import views
File "/Users/MAC/dev/thermos/thermos/views.py", line 10, in <module>
@app.route('/index')
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1080, in decorator
self.add_url_rule(rule, endpoint, f, **options)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 64, in wrapper_func
return f(self, *args, **kwargs)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1051, in add_url_rule
'existing endpoint function: %s' % endpoint)
AssertionError: View function mapping is overwriting an existing endpoint function: index

This is my __init__.py:
import os

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

basedir = os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SECRET_KEY']= '\xd4\xdf\xac\xf1\x1f\xcbGt\xd0,\xbb\xd9\x02\xaf/+n\x08\x13t\x9fd\x12g'
app.config['SQLALCHEMY_DATABASE_URI'] ='sqlite:///'+ os.path.join(basedir,'thermos.db')
app.config['SQLALCHEMY_TRACK_MODIFICATION'] = False
app.config['DEBUG']= True
db = SQLAlchemy(app)

import models
import views
import os

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

basedir = os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SECRET_KEY']= 'its_a_secret'
app.config['SQLALCHEMY_DATABASE_URI'] ='sqlite:///'+ os.path.join(basedir,'thermos.db')
app.config['SQLALCHEMY_TRACK_MODIFICATION'] = False
app.config['DEBUG']= True
db = SQLAlchemy(app)

import models
import views

and my manaage.py is this:

#! /usr/bin/env python

from thermos import app, db
from thermos.models import User
from flask_script import Manager, prompt_bool

from thermos import db
from models import User

manager = Manager(app)

@manager.command
def initdb():
db.create_all()
db.session.add(User(username="olatunji",email="olatunji. [email protected]"))
db.session.add(User(username="Samuel",email="abiodun@Sam [email protected]"))
db.session.commit()
print 'Initialized the database'

@manager.command
def dropdb():
if prompt_bool(
"Are you sure you want to lose all your data"):
db.drop_all()
print 'Dropped the database'

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

and my model.py is this:
from datetime import datetime

from sqlalchemy import desc

from thermos import db

class Bookmark(db.Model):
id = db.Column(db.Integer,primary_key=True)
url = db.Column(db.Text,nullable=False)
date = db.Column(db.DateTime,default=datetime.utcnow)
description = db.Column(db.String(300))
user_id = db.Column(db.Integer,db.ForeignKey('user.id'),nullable=False)

@staticmethod
def newest(num):
return Bookmark.query.order_by(desc(Bookmark.date)).limit(num)

def __repr__(self):
return "<Bookmark '{}': '{}'>".format(self.description,self.url)

class User(db.Model):
id = db.Column(db.Integer,primary_key=True)
username = db.Column(db.String(80),unique=True)
email = db.Column(db.String(120),unique=True)
bookmarks = db.relationship('Bookmark',backref='user',lazy='dynamic')

def __repr__(self):
return "<User '{}'>".format(self.username)
how can I correct this error?

[nilamo]

Error:
 AssertionError: View function mapping is overwriting an existing endpoint function: index 

Do you have more than one function routed to "/" in your views?

[rarevesselt]

Error:
(most recent call last):
File "manage.py", line 3, in <module>
from thermos import app, db
File "/Users/MAC/dev/thermos/thermos/__init__.py", line 16, in <module>
import views
File "/Users/MAC/dev/thermos/thermos/views.py", line 10, in <module>
@app.route('/index')
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1080, in decorator
self.add_url_rule(rule, endpoint, f, **options)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 64, in wrapper_func
return f(self, *args, **kwargs)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1051, in add_url_rule
'existing endpoint function: %s' % endpoint)
AssertionError: View function mapping is overwriting an existing endpoint function: index

This is my __init__.py:

import os
 
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
 
basedir = os.path.abspath(os.path.dirname(__file__))
 
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] ='sqlite:///'+ os.path.join(basedir,'thermos.db')
app.config['SQLALCHEMY_TRACK_MODIFICATION'] = False
app.config['DEBUG']= True
db = SQLAlchemy(app)

This is my view.py:

from flask import render_template, flash, redirect, url_for
 
from thermos import app,db
from forms import BookmarkForm
from models import User, Bookmark
 
def logged_in_user():
    return user.query.filter_by(username='olatunji').first()
 
@app.route('/')
@app.route('/index')
def index():
    return render_template('index.html',new_bookmarks=models.Bookmark.newest(5))
 
@app.route('/add',methods=['GET','POST'])
def add():
    form = BookmarkForm()
    if form.validate_on_submit():
        url = form.url.data
        description = form.description.data
        bm = models.Bookmark(url=url, description=description)
        bm = Bookmark(user=logged_in_user(),url=url,description=description)
        db.session.add(bm)
        db.session.commit()
        flash("stored '{}'".format(description))
        return redirect(url_for('index'))
    return render_template('add.html',form=form)
 
if __name__ == "__main__":
    app.run(debug=True)

I need help on this.

[nilamo]

@app.route('/')
@app.route('/index')
def index():
    return render_template('index.html',new_bookmarks=models.Bookmark.newest(5))

Try getting rid of one of those routes.  / and /index are the same thing, which could be throwing the assertion.

[rarevesselt]

Try getting rid of one of those routes. / and /index are the same thing, which could be throwing the assertion.

I have removed one of the routes but the error is still been raised.

[buran]

the problem is that in thermos app you also have route index and the traceback is pretty clear about that

Error:
File "manage.py", line 3, in <module>
from thermos import app, db
File "/Users/MAC/dev/thermos/thermos/__init__.py", line 16, in <module>
import views
File "/Users/MAC/dev/thermos/thermos/views.py", line 10, in <module>
@app.route('/index')
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1080, in decorator
self.add_url_rule(rule, endpoint, f, **options)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 64, in wrapper_func
return f(self, *args, **kwargs)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1051, in add_url_rule
'existing endpoint function: %s' % endpoint)
[error]AssertionError: View function mapping is overwriting an existing endpoint function: index

note the chain of imports: from thermos import app ->__init__.py -> views.py and there on line 10 you have @app.route('/index')

[rarevesselt]

note the chain of imports: from thermos import app ->__init__.py -> views.py and there on line 10 you have @app.route('/index')

.
How do I resolve this to avoid this cyclic import because I noticed when I move manage.py into the thermos package it ran.Is there a way to make manage.py stand alone and avoid cyclic import problem as well.Thats what am trying to do.Any suggestion will be appreciated.

[buran]

Please repost your original post in code tags as well as provide info on your project structure
at the moment it look like you use from thermos import app,db everywhere

[rarevesselt]

This is the project structure

Users-MacBook-Pro:thermos MAC$ ls -R

README.rst manage.py thermos

./thermos:
__init__.py forms.py models.py static thermos.db views.py
__init__.pyc forms.pyc models.pyc templates thermos.pyc views.pyc

./thermos/static:
css img js

./thermos/static/css:
main.css normalize.css normalize.min.css

./thermos/static/img:

./thermos/static/js:
main.js vendor

./thermos/static/js/vendor:
jquery-1.11.2.min.js modernizr-2.8.3-respond-1.4.2.min.js

./thermos/templates:
404.html add.html base.html form_macros.html index.html

This is the __init__.py:

import os

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

basedir = os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir, 'thermos.db')
app.config['DEBUG'] = True
db = SQLAlchemy(app)

import models
import views

This is the views.py:

from flask import render_template, flash, redirect, url_for, abort

from thermos import app, db
from forms import BookmarkForm
from models import User, Bookmark

# Fake login
def logged_in_user():
    return User.query.filter_by(username='olatunji').first()

@app.route('/')
@app.route('/index')
def index():
    return render_template('index.html', new_bookmarks=Bookmark.newest(5))


@app.route('/add', methods=['GET', 'POST'])
def add():
    form = BookmarkForm()
    if form.validate_on_submit():
        url = form.url.data
        description = form.description.data
        bm = Bookmark(user=logged_in_user(), url=url, description=description)
        db.session.add(bm)
        db.session.commit()
        flash("Stored '{}'".format(description))
        return redirect(url_for('index'))
    return render_template('add.html', form=form)


@app.route('/user/<username>')
def user(username):

    user = User.query.filter_by(username=username).first_or_404()
    return render_template('user.html', user=user)


@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'), 404


@app.errorhandler(500)
def page_not_found(e):
    return render_template('500.html'), 500

This is the manage.py:

#! /usr/bin/env python

from thermos import app,db
from thermos.models import User
from flask_script import Manager, prompt_bool

manager = Manager(app)

@manager.command
def initdb():
    db.create_all()
    db.session.add(User(username="olatunji",email="olatunji.    [email protected]"))
    db.session.add(User(username="Samuel",email="abiodun@sam    [email protected]"))
    db.session.commit()
    print 'Initialized the database'

@manager.command
def dropdb():
    if prompt_bool(
        "Are you sure you want to lose all your data"):
        db.drop_all()
        print 'Dropped the database'
        
if __name__ == '__main__':
    manager.run()

This is form.py:

from flask_wtf import FlaskForm
from wtforms import StringField
from wtforms.fields.html5 import URLField
from wtforms.validators import DataRequired,url

class BookmarkForm(FlaskForm):
    url = URLField('The URL for your bookmark:',validators=[DataRequired(),url()])
    description = StringField('Add an optional description')

    def validate(self):
        if not self.url.data.startswith("http://") or\
            self.url.data.startswith("https://"):
            self.url.data = "http://" + self.url.data
        
        if not FlaskForm.validate(self):
            return False
        
        if not self.description.data:
            self.description.data = self.url.data
        return True

[rarevesselt]

Error:
File "manage.py", line 3, in <module>
from thermos import app, db
File "/Users/MAC/dev/thermos/thermos/__init__.py", line 16, in <module>
import views
File "/Users/MAC/dev/thermos/thermos/views.py", line 10, in <module>
@app.route('/index')
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1080, in decorator
self.add_url_rule(rule, endpoint, f, **options)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 64, in wrapper_func
return f(self, *args, **kwargs)
File "/Users/MAC/.envs/thermos/lib/python2.7/site-packages/flask/app.py", line 1051, in add_url_rule
'existing endpoint function: %s' % endpoint)
[error]AssertionError: View function mapping is overwriting an existing endpoint function: index

note the chain of imports: from thermos import app ->__init__.py -> views.py and there on line 10 you have @app.route('/index')
[/quote]

Please repost your original post in code tags as well as provide info on your project structure
at the moment it look like you use from thermos import app,db everywhere

How can I do away with this error?