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How do you query for “is not null” in Mongo?
...: 1 }
{ "_id" : ObjectId("544540f11b5cf91c4893eb99"), "otherField" : 2 }
Now, create the sparse index on imageUrl field:
db.foo.ensureIndex( { "imageUrl": 1 }, { sparse: true } )
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
...
How to use UIVisualEffectView to Blur Image?
...the blur to an image? I've been trying to figure out the code for a while now :( still new at obj c!
7 Answers
...
.htaccess mod_rewrite - how to exclude directory from rewrite rule
...ectories on my server from these rules, so they can become accessible. For now all requests are sent to index.php file.
6 ...
An error occurred while validating. HRESULT = '8000000A'
...
This is a known issue in Visual Studio 2010 (a race condition). See this connect item.
We've run into this as well, and had a very unsatisfying support call on this issue with Microsoft. Long story short: it's a known issue, it won't b...
Unicode Processing in C++
...ng so new at present.
EDIT: To clarify, C++11 is Unicode aware in that it now has support for Unicode literals and Unicode strings. However, the standard library has only limited support for Unicode processing and conversion. For your current needs this may be enough. However, if you need to do a l...
How to create a release signed apk file using Gradle?
... for two passwords and a bunch of info. (Same stuff as in Android Studio.) Now copy/paste your previously chosen passwords.
(3) Edit your module gradle.build file to use the above
The following parts need to be present in your app/module's Gradle build file. First, add the following lines outside ...
Assign multiple columns using := in data.table, by group
...
This now works in v1.8.3 on R-Forge. Thanks for highlighting it!
x <- data.table(a = 1:3, b = 1:6)
f <- function(x) {list("hi", "hello")}
x[ , c("col1", "col2") := f(), by = a][]
# a b col1 col2
# 1: 1 1 hi hello
# ...
Get the current language in device
...ot change based on orientation, etc).
Because getConfiguration.locale has now been deprecated, the preferred way to get the primary locale in Android Nougat is:
Resources.getSystem().getConfiguration().getLocales().get(0);
To guarantee compatibility with the previous Android versions a possible ...
Create list of single item repeated N times
...'string'] * len(columns)
Mutable items
I've used Python for a long time now, and I have never seen a use-case where I would do the above with a mutable instance. Instead, to get, say, a mutable empty list, set, or dict, you should do something like this:
list_of_lists = [[] for _ in columns]
T...
How do I remove the “extended attributes” on a file in Mac OS X?
...o longer lists -c and produces "-c not recognized" when used. Very painful now to remove extended attributes one by one.
– helioz
Jan 29 '13 at 2:39
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