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When to use a “has_many :through” relation in Rails?
I am trying to understand what has_many :through is and when to use it (and how). However, I am not getting it. I am reading Beginning Rails 3 and I tried Googling, but I am not able to understand.
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Least common multiple for 3 or more numbers
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Given a function f and a list l = [a,b,c,d], reduce(f,l) returns f(f(f(a,b),c),d). It's the functional implementation of "lcm can be computed by iteratively computing the lcm of the current value and the next element of the list."
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textarea - disable resize on x or y?
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Sure it is possible with css and jquery
CSS:
resize: vertical;
resize: horizontal;
jQuery
$('textarea').css("resize", "vertical");
$('textarea').css("resize", "horizontal");
Bootstrap
just put the class in Textarea
for the vertical resize: vresi...
'const string' vs. 'static readonly string' in C#
...e a const value in a different assembly, then update the original assembly and change the value, the other assembly won't see the change until you re-compile it.
A static readonly string is a normal field that gets looked up at runtime. Therefore, if the field's value is changed in a different ass...
What is the difference between Spring's GA, RC and M2 releases?
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GA = General availability (a release); should be very stable and feature complete
RC = Release candidate; probably feature complete and should be pretty stable - problems should be relatively rare and minor, but worth reporting to try to get them fixed for release.
M = Milestone buil...
ASP.NET MVC - Should business logic exist in controllers?
.....}
}
This assumes that tax is calculate by an external service, and requires your model to know about interfaces to your external services.
This would make your controller look something like:
public class OrdersController{
public OrdersController(ITaxService taxService, IOrdersRepo...
How does the SQL injection from the “Bobby Tables” XKCD comic work?
...LName.Text + "')";
This is the naive way to add text input into a query, and is very bad, as you will see.
After the values from the first name, middle name textbox FNMName.Text (which is Robert'); DROP TABLE STUDENTS; --) and the last name textbox LName.Text (let's call it Derper) are concatenat...
How to move one word left in the vi editor
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Use b to move back one word.
Use w to move forward one word.
And here is a cheat sheet that might be useful for you:
Source: Graphical vi-vim Cheat Sheet and Tutorial
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improv...
Validate a username and password against Active Directory?
How can I validate a username and password against Active Directory? I simply want to check if a username and password are correct.
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RSpec vs Cucumber (RSpec stories) [closed]
When should I use specs for Rails application and when Cucumber (former rspec-stories)? I know how both work and actively use specs, of course. But it still feels weird to use Cucumber. My current view on this, is that it's convenient to use Cucumber when you're implementing application for the clie...