I got this error while trying to start mongodb on amazon ec2. Running this command in the terminal solved the problem.
export LC_ALL=C
I don’t have any idea about what it means at this time except that it sets the terminal to display all languages. If you can explain what actually it does, please drop a comment.
Django traceback is a very helpful tool in Django development. It saves us from the boring tasking of writing print statements to track variables.
Traceback doesn’t kick when there is no error. There may be no coding errors but there is a flaw in our application logic which we want to debug. In such cases we can trigger Django traceback by adding assert False in our code.
example:
def hello_world(response):
test_var = "Something"
test_var2 = "another var"
assert false
return HttpResponse(test_var+test_var2)
Python site packages are located at
Library/Python/2.7/site-packages
Some times we need to get the number of documents with a distinct/unique value. An example use case is in the classic blog example.
You can use the following commands to get the answers for the above questions
db.posts.distinct('author').length
db.posts.distinct('tag').length
Reference:
After almost two weeks and several re-installs and fresh installs, I finally got to integrate mongodb and elastic search. Here is a step by step procedure on how to integrate them.
If you follow this procedure carefully, it will prevent errors like
Exception: java.lang.NoSuchMethodError: com.mongodb.Mongo.fsyncAndLock()
{
“error” : “IndexMissingException[[testmongo] missing]”,
“status” : 404
}
Follow these guide to install MonogDB and Elastic Search
After you installed them, its time to install elastic search river.
Download the snapshot from here. Extract it and copy its contents to elastic_search_root/plugins/plugins/mongodb_river
Note: The initial implementation tutorial give on the git page points to a older version of the snapshot and it doesn’t work with the latest versions of elastic search and mongodb.
Run the following two commands to install the mongodb river. If you are on a slow connection, the first command can take more than 15 minutes.
ES_HOME/bin/plugin -install elasticsearch/elasticsearch-mapper-attachments/1.4.0
ES_HOME/bin/plugin -install richardwilly98/elasticsearch-river-mongodb/1.4.0
After you install both of them, restart elasticsearch.
ES_HOME/bin/service/elasticsearch restart
Enable replica sets in mongodb by following this tutorial
Tell elastic search to index the “person” colletion in testmongo database by issuing the following command in your terminal
curl -XPUT 'http://localhost:9200/_river/mongodb/_meta' -d '{
"type": "mongodb",
"mongodb": {
"db": "testmongo",
"collection": "person"
},
"index": {
"name": "mongoindex",
"type": "person"
}
}'
add some data to the mongodb through mongo terminal
use testmongo
var p = {firstName: "John", lastName: "Doe"}
db.person.save(p)
Use this command to search the data
curl -XGET 'http://localhost:9200/mongoindex/_search?q=firstName:John'
I got the following error while trying to create a super user from shell for django1.4.
File "/Library/Python/2.7/site-packages/django/contrib/auth/management/__init__.py", line 85, in get_system_username return getpass.getuser().decode(locale.getdefaultlocale()[1]) TypeError: decode() argument 1 must be string, not None
This problem was rectified by running this command in terminal before adding the user
export LANG="en_US.UTF-8"
I’m guessing this character encoding problem while running syncdb is the reason for the following error while accessing admin section of django1.4
DoesNotExist at /admin/ Site matching query does not exist. Request Method: GET Request URL: http://127.0.0.1:8000/admin/ Django Version: 1.4 Exception Type: DoesNotExist Exception Value: Site matching query does not exist. Exception Location: /Library/Python/2.7/site- packages/Django-1.4-py2.7.egg/django/db/models/query.py in get, line 366 Python Executable: /usr/bin/python Python Version: 2.7.1 Python Path: ['/Users/mohammedelsebaey/a/mysite1', '/Library/Python/2.7/site-packages/Django-1.4-py2.7.egg', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 /plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 /plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 /plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/ python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 /lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 /lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 /lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/ python/PyObjC', '/Library/Python/2.7/site-packages']
If i’m wrong you can solve the above problem by running this code i django shell
from django.contrib.sites.models import Site Site.objects.create(pk=1)
start Apache
apachectl start
Stop Apache
apachectl stop
Restart Apache
apachectl restart
If the above commands don’t work, try these
/etc/init.d/httpd start
/etc/init.d/httpd stop
/etc/init.d/httpd restart
You can also start the web server from the system preferences. Open system preferences, go to sharing and then enable web sharing
starting webserver in mac osx
On mac httpd.conf file is located in the directory /etc/apache2/. You can access it through terminal if you want to navigate to it through finder, on finder toolbar goto go->go to folder and type in /etc/apache2
Navigate to hidden folders in MAC
Navigating to system files on MAC OSX
If you get a -bash: make: command not found error while trying to compile from source, you have to install xcode and then in xcode goto preferences->downloads and install xcode developer tools
installing command line tools on MAC OSX
If mobile browsers are not respecting your media queries and showing desktop instead of mobile site, add this meta tag before linking the style sheet.
<meta name="viewport" content="width=device-width">