So Ive managed to screw something up between my production database settings for heroku.
Running the production settings locally I receive the error,
ImproperlyConfigured at /
settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.
And I get the following error when deployed to Heroku seen here: http://tulsa-staging.herokuapp.com
Exception Value:
cannot concatenate 'str' and 'NoneType' objects
It appears that it has to do with my Database settings but I'm just not sure how to resolve this.
prod.py database settings for Heroku
urlparse.uses_netloc.append('postgres')
urlparse.uses_netloc.append('mysql')
try:
if 'DATABASE_URL' in os.environ:
url = urlparse.urlparse(os.environ['DATABASE_URL'])
DATABASES = {
'default':{
'ENGINE':'django.db.backends.postgresql_psycopg2',
'NAME': url.path[1:],
'USER': url.username,
'PASSWORD': url.password,
'HOST': url.hostname,
'PORT': url.port
}
}
except Exception:
print 'Unexpected error:', sys.exc_info()
Any thoughts on how to resolve this?
Why aren't you using dj-database-url?
It makes this so much easier:
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://localhost')}
It automatically looks for and parses the value in env['DATABASE_URL'], falling back to what you pass into default.
It's what Heroku actually recommends you use.
Related
From the docs, it looks like the database needs to be present in the settings.py. Is there a way to pass the database details while running python manage.py runserver given the migrations have been completed?
Edit -
Use case - The database is not known beforehand so I can't have it hardcoded in settings.py. Also, there will be one database for the entire app.
Using a settings file other than settings.py in Django - This questions answers how to use a settings file different than settings.py. However, I am looking for ways in which I don't use settings file to specify the database credentials.
split your settings.py into two files
base_settings.py (add all the common settings here)
development.py
(add your database settings here)
like :
from .base_settings import *
DATABASES = {
'default': {
'ENGINE': 'XX.db.backends.postgresql',
'NAME': 'XX',
'USER': 'postgres',
'ATOMIC_REQUESTS':True,
'PASSWORD': '*****',
'HOST': '0.0.0.0',
'PORT': '5432',
}
}
and run your project using
python manage.py runserver 0.0.0.0:8002 --settings=django_project_name.development
I have been struggling for this issue for the whole days while no solutions at all. so I post it here.
I am trying to set up a blog website in Heroku via Django 1.8 which uses Python 3.4.3. I follows the instructions from Heroku website here.
I use "foreman start" to run Django project in my Mac and I already installed all dependence.
Part of my setting.py file involving the database initially looks like:
import dj_database_url
DATABASES = {}
DATABASES['default'] = dj_database_url.config()
Then I got error: ImproperlyConfigured at /settings.DATABASES is improperly configured. Please supply the ENGINE value.
Then I modify the files by adding one line supplying the ENGINE value:
import dj_database_url
DATABASES = {}
DATABASES['default'] = dj_database_url.config()
DATABASES['default']['ENGINE'] = 'django.db.backends.postgresql_psycopg2'
Based on this post answered by Or Arbel, it should work. But I got another error: ImproperlyConfigured at /settings.DATABASES is improperly configured. Please supply the NAME value.
What should I do next? Actually my Django project is very simple and does not involve any database operations(may need in the future). I just want to make it works on Heroku. Thanks!
Do I need to create a database to continue? I just want to make the webpage works.
Thanks for your guys help, specially souldeux.
Update:
I have fixed the issue by using souldeux's method by providing more informations about the database. Here I want to emphasis that it seems the code from the original Heroku tutorial does not work for Django 1.8:
import dj_database_url ####not working for my case
DATABASES = {}
DATABASES['default'] = dj_database_url.config()
Initially I did not create a database because I think it is not necessary for simple projects, based on my understanding obtained from Heroku tutorial. Actually it does need to create a database in Heroku to make it works. The tutorial is here. You need run "heroku config -s | grep HEROKU_POSTGRESQL" to get the database information. The format is like:
scheme://username:password#host:port/database
So you can get 'database', 'username', 'password', etc.
Afterwards, modify the 'settings.py' according to souldeux, then run following codes:
git add .
git commit -m "Ready to go to Heroku"
git push heroku master
heroku run python manage.py syncdb
Now it works. But other issues arise like my webpages do not show images... Anyway it solved. Please confirm my solutions, thanks.
I think you need to add more information to your database definition. For instance, here's what my own database entry looks like in my settings.py:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'django',
'USER': 'redacted',
'PASSWORD': 'redacted',
'HOST': '127.0.0.1',
'PORT': '5432',
}
}
If you don't have a database user and password to enter in the fields marked redacted then you need to make sure you have the actual database created and psycopg2 installed.
I am following the django instruction to learn django in eclipse.
I came to the part of running cmd
python manage.py migrate
and it complains about unknown command migrate.
Googled. Knew that it requires South module to be included. I downloaded/installed south, and added 'south' in the INSTALLED_APPS.
I ran the command again, this time it complains
import MySQLdb as Database
ImportError: No module named 'MySQLdb'
So I looked for MySQLdb, only to find that there is none for python 3.
I could not find anything useful. So what do you do to make django to work with mysql?
I know there're other connectors around, but I am trying to follow the django tutorial and it seems that 'migrate' cmd must use 'south' and 'south' must use MySQLdb(?)
--- update ---
Here is the DB settings in settings.py:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'test',
'USER': 'root',
'PASSWORD': '******',
'HOST': '127.0.0.1',
'PORT': '3306',
}
}
I suspect 'ENGINE' has to be something else, but I failed to find enough information online to figure it out...
You can switch to any database you want MySQL or postgresql or sqlite etc for your django app. South uses the default database engine from your django setting DATABASES. As stated here
South automatically exposes the correct set of database API operations
as south.db.db; it detects which database backend you’re using from
your Django settings file.
I put a Django app on Heroku recently. The home page looks fine, but when I try to go to a page that involves making a query (e.g. p = Photo.objects.get(title=title)), I get this error:
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port 5432?
In accordance with this answer, I did $ heroku pg:promote HEROKU_POSTGRESQL_GREEN_URL
Then in my settings.py:
DATABASES = {'default': dj_database_url.config(default=os.environ['DATABASE_URL'])}
Still got the same error, so I tried looking at the results of this (as this answer suggests):
$ heroku run python manage.py shell
>>> from django.conf import settings
>>> print settings.DATABASES['default']
{'TIME_ZONE': 'UTC', 'TEST_MIRROR': None, 'NAME': 'snorthway', 'OPTIONS': {},
'HOST': 'localhost', 'TEST_NAME': None, 'PASSWORD': '******', 'ENGINE':
'django.db.backends.postgresql_psycopg2', 'PORT': '', 'USER': 'snorthway',
'TEST_COLLATION': None, 'TEST_CHARSET': None}
At which point I realized I don't know what I should even be looking for in that. I still don't understand what the error means, so I am unsure how to go about debugging it.
You have not configured your django database correctly in settings.py. It thinks your database is on localhost. Sounds like you have a heroku postgres database so your host should be something like:
df3-64-304-50-250.compute-1.amazonaws.com
Heroku exposes a special database URL through an environment variable called:
DATABASE_URL
There is a very cool python package here called dj_database_url: https://github.com/kennethreitz/dj-database-url it converts that environment variable to what django expects.
you can install it with:
$pip install dj-database-url
I use the following in my settings.py
import dj_database_url
DATABASES = {
'default': dj_database_url.config()
}
I'm trying to get my local dev django app to work after following these instructions on adding env database settings.
https://devcenter.heroku.com/articles/django-injection
I followed the instructions but get the following error when my app tries to access the local database
Request Method: GET
Request URL: http://localhost:8000
Django Version: 1.4
Exception Type: ImproperlyConfigured
Exception Value:
You need to specify NAME in your Django settings file.
My database settings originally,
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'db', # Or path to database file if using sqlite3.
'USER': 'foo', # Not used with sqlite3.
'PASSWORD': 'bar', # Not used with sqlite3.
'HOST': 'localhost',
'PORT': '5432',
}
}
the heroku article says to add the following to the settings file
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://localhost')}
how do I get dj_database_url.config to use my my dev settings when the DATABASE_URL is not available in dev?
You can just add your dev settings to the default values like this...
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://foo:bar#localhost:5432/db')}
Use this in your settings.py:
DATABASES = {'default': dj_database_url.config(default=os.environ['DATABASE_URL'])}
and in your .env file have this:
DATABASE_URL=postgres://localhost/yourdbname
when you launch with "foreman start" it will look at the .env file and create all those environment variables, just like running on Heroku itself. Type "heroku config" to confirm that you have a DATABASE_URL set, which you should if you added the postgres database addon.
Just set an environment variable on your operating system and check weither or not it's set. For instance, with a UNIX system:
# In ~/.bash_profile
export LOCAL_DEV=true
# In settings.py
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://localhost')}
if bool(os.environ.get('LOCAL_DEV', False)):
# Override DATABASES['default'] with your local database configuration
Also, if you need to set an environment variable on your heroku space:
heroku config:add MY_VAR='my_value'
I just tried this and here is my code:
import dj_database_url
local_db = 'postgres://django_login:123456#localhost/django_db'
DATABASES = {'default': dj_database_url.config(default=local_db)}
My database name is "django_db", user name is "django_login", password is "123456".
My code can run both in local machine and heroku.
import dj_database_url
DATABASES = {'default':
dj_database_url.config(default='postgres://yourusername:yourpassword#yourhosturl:5432/yourdbname')}
** Replace bold string with your database settings
if you are using local database then replace yourhosturl by localhost