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Why should I prefer to use member initialization lists?
...tyle. For class members which are classes, then it avoids an unnecessary call to a default constructor. Consider:
class A
{
public:
A() { x = 0; }
A(int x_) { x = x_; }
int x;
};
class B
{
public:
B()
{
a.x = 3;
}
private:
A a;
};
In this case, the construct...
How to simulate the environment cron executes a script with?
...d by systemd "timers" as a cron replacement. Whether you run the systemd "service" from the CLI or via cron, it receives exactly the same environment, avoiding the environment mismatch problem.
The most common issue to cause cron jobs to fail when they pass manually is the restrictive default $PAT...
Get element inside element by class and ID - JavaScript
...er than worrying about browser compatibility yourself (let someone else do all the work). If you want just a library to do that, then Sizzle will work great. In Sizzle, this would be be done like this:
Sizzle("#foo .bar")[0].innerHTML = "Goodbye world!";
jQuery has the Sizzle library built-in...
OS detecting makefile
... still use solely uname, but you have to deal with if/else blocks to check all MinGW, Cygwin, etc. variations.
The environment variable OS is always set to "Windows_NT" on different Windows versions (see %OS% environment variable on Wikipedia).
An alternative of OS is the environment variable MSVC (...
Django set field value after a form is initialized
...value after the form was submitted, you can use something like:
if form.is_valid():
form.cleaned_data['Email'] = GetEmailString()
Check the referenced docs above for more on using cleaned_data
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Should I use 'has_key()' or 'in' on Python dicts?
...
in is definitely more pythonic.
In fact has_key() was removed in Python 3.x.
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How to get the sizes of the tables of a MySQL database?
I can run this query to get the sizes of all tables in a MySQL database:
16 Answers
16...
Where to find Application Loader app in Mac?
I have downloaded applicationloader_1.3.dmg and installed in the destination Macintosh HD.
15 Answers
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Downloading MySQL dump from command line
...skills necessary; before I complete the transition to a more noob-friendly service, I need to download the contents of a MySQL database. Is there a way I can do this from the command line?
...
rails - Devise - Handling - devise_error_messages
...hould help you get started. :)
Another update
The resource object is actually the model that is being used by devise (go figure).
resource.class #=> User
resource.errors.class #=> ActiveModel::Error
It also appears to be defined in a higher scope (probably coming from the contro...