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git: difference between “branchname” and “refs/heads/branchname”
...ree types of refs in your repository.
refs/heads/0.58 specifies a branch named 0.58. If you don't specify what namespace the ref is in, git will look in the default ones. This makes using only 0.58 conceivably ambiguous - you could have both a branch and a tag named 0.58.
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Order of member constructor and destructor calls
Oh C++ gurus, I seek thy wisdom. Speak standardese to me and tell my if C++ guarantees that the following program:
4 Answer...
MySQL CONCAT returns NULL if any field contain NULL
...pty string by wrapping it in COALESCE
SELECT CONCAT(COALESCE(`affiliate_name`,''),'-',COALESCE(`model`,''),'-',COALESCE(`ip`,''),'-',COALESCE(`os_type`,''),'-',COALESCE(`os_version`,'')) AS device_name
FROM devices
share
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How can I ignore everything under a folder in Mercurial
...
PhiLho, I think that would also filter out files named bin
– Peter Gibson
May 16 '11 at 23:13
1
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How to set a Django model field's default value to a function call / callable (e.g., a date relative
...efining a function, so function default values are irrelevant:
from datetime import datetime, timedelta
class MyModel(models.Model):
# default to 1 day from now
my_date = models.DateTimeField(default=datetime.now() + timedelta(days=1))
This last line is not defining a function; it is invoking...
CSS hexadecimal RGBA?
...ate which is heavily susceptible to change, the current version of the document implies that in the somewhat near future CSS will support both the 4 and 8-digit hexadecimal RGBA notation.
Note: the following quote has irrelevant chunks cut out and the source may have been heavily modified by the ti...
MVC Vs n-tier architecture
...s each layer separated by the network. I.E. the presentation layer is on some web servers, then that talks to backend app servers over the network for business logic, then that talks to a database server, again over the network, and maybe the app server also calls out to some remote services (say A...
How to convert 1 to true or 0 to false upon model fetch
...hecked = !!+response.isChecked
You can do this manipulation in the parse method:
parse: function (response) {
response.isChecked = !!+response.isChecked;
return response;
}
UPDATE: 7 years later, I find Number(string) conversion more elegant. Also mutating an object is not the best idea. Th...
Is it valid to have a html form inside another html form?
...id HTML nor XHTML
In the official W3C XHTML specification, Section B. "Element Prohibitions", states that:
"form must not contain other form elements."
http://www.w3.org/TR/xhtml1/#prohibitions
As for the older HTML 3.2 spec,
the section on the FORMS element states that:
"Every form must be...
How do you use window.postMessage across domains?
It seems like the point of window.postMessage is to allow safe communication between windows/frames hosted on different domains, but it doesn't actually seem to allow that in Chrome.
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