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Django Admin - Disable the 'Add' action for a specific model
...as Admin, you get EVERYTHING no matter what.
But if you create a new user group called "General Access" (for example) then you can assign ONLY the CHANGE and DELETE permissions for all of your models.
Then any logged in user that is a member of that group will not have "Create" permission, nothing...
What's the Hi/Lo algorithm?
...based on.
The hi/lo algorithms splits the sequences domain into “hi” groups. A “hi” value is assigned synchronously. Every “hi” group is given a maximum number of “lo” entries, that can by assigned off-line without worrying about concurrent duplicate entries.
The “hi” token i...
What is the minimum I have to do to create an RPM file?
...toy bin rpm package
Name: toybinprog
Version: 1.0
Release: 1
License: GPL+
Group: Development/Tools
SOURCE0 : %{name}-%{version}.tar.gz
URL: http://toybinprog.company.com/
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
%description
%{summary}
%prep
%setup -q
%build
# Empty section.
%...
Sending a notification from a service in Android
...notification from a service. If you have problems then take a look at this groups.google.com/group/android-developers/browse_thread/thread/…
– Karussell
Apr 2 '11 at 22:24
...
Avoid web.config inheritance in child web application using inheritInChildApplications
...;section/> tag into <location/>, so we have to create a <secionGroup /> and put our unwanted sections into that group. Section groups can be later inserted into a location tag.
So we have to change this:
<configSections>
<section name="unwantedSection" />
</configSe...
How to flatten tree via LINQ?
...c => Flatten(c.Elements)).Concat(new[] { e });
You can then filter by group using Where(...).
To earn some "points for style", convert Flatten to an extension function in a static class.
public static IEnumerable<MyNode> Flatten(this IEnumerable<MyNode> e) =>
e.SelectMany(c...
Count(*) vs Count(1) - SQL Server
...CT COUNT(1) FROM dbo.tab800krows
SELECT COUNT(1),FKID FROM dbo.tab800krows GROUP BY FKID
SELECT COUNT(*) FROM dbo.tab800krows
SELECT COUNT(*),FKID FROM dbo.tab800krows GROUP BY FKID
Same IO, same plan, the works
Edit, Aug 2011
Similar question on DBA.SE.
Edit, Dec 2011
COUNT(*) is mentioned s...
What are five things you hate about your favorite language? [closed]
..., in my opinion.
Why do we need to completely respecify the formula for a GROUPed column, rather than setting an alias on the column and then GROUP BY the alias (or column index as with SORT)?
share
...
Graph visualization library in JavaScript
...ming API for customizing each and every aspect of the library
Support for grouping and nesting (both interactive, as well as through the layout algorithms)
Does not depend on a specfic UI toolkit but supports integration into almost any existing Javascript toolkit (see the "integration" demos)
Auto...
How do SQL EXISTS statements work?
...u'd have to use a JOIN. But most don't want that duplication, and running GROUP BY/DISTINCT is liable to add overhead to the query. EXISTS is more efficient than SELECT DISTINCT ... FROM SUPPLIERS JOIN ORDERS ... on SQL Server, haven't tested on Oracle or MySQL lately.
– OMG ...