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When to use a “has_many :through” relation in Rails?
...l same as the has_many relationship
has_many :group_memberships
end
Now you can treat it like a normal has_many, but get the benefit of the association model when you need it.
Note that you can also do this with has_one.
Edit: Making it easy to add a user to a group
def add_group(group, r...
Renaming table in rails
... table (or SQLite or PostgreSQL, depending on what database you're using). Now, as it happens, ActiveRecord::ConnectionAdapters::MysqlAdapter is already accessible through Model.connection, so you should be completely able to do Model.connection.rename_table, using any model in your application.
[/E...
Haskell error parse error on input `='
...
@Bakuriu LYAH does now mention let. But a follow-up. In LYAH I read addThree :: Int -> Int -> Int -> Int (newline) addThree x y z = x + y + z but only the second one runs in GHCi with let. Why?
– isomorphismes
...
Displaying the Indian currency symbol on a website
...where else, he will see Rs and not some other or blank character.
You can now also use the new Rupee unicode symbol — U+20B9 INDIAN RUPEE SIGN. It can be used in this manner:
<span class="WebRupee">&#x20B9;</span> 500
Just include the following script and it will update all the...
How to get error information when HttpWebRequest.GetResponse() fails
...exception text into the body of the response, then set status code to 500. Now the client would throw an exception when it encounters a 500 error but you could read the response stream and fetch the message of the exception.
So you could catch a WebException which is what will be thrown if a non 20...
Compare two MySQL databases [closed]
... All the tools mentioned look good. I am selecting Toad arbitrarily for now until I could conduct some more research.
– Vincent Ramdhanie
Oct 22 '08 at 14:25
64
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How do I install the OpenSSL libraries on Ubuntu?
... tell
apt-get to list all packages, and grep
for ssl? Or do I need to know the
"lib*-dev" naming convention?
If you're linking with -lfoo then the library is likely libfoo.so. The library itself is probably part of the libfoo package, and the headers are in the libfoo-dev package as you've ...
jQuery: select an element's class and id at the same time?
...s one did:
$('#country .save')
so my conclusion is to use the space. Now I don't know if it's to the new version of jQuery that I'm using (1.5.1), but anyway hope this helps to anyone with similar problem that I've had.
edit: Full credit for explanation (in the comment to Alex's answer) goes ...
SQL Server dynamic PIVOT query?
...
Cool! Do you know of a way to add a prefix to the value column names - so you have a result with columns: date, Amount_ABC, Amount_DEF, Amount_GHI? I am asking, because I would like to join an additional value column to it and then I would...
Are C++ enums signed or unsigned?
... // signed enum
enum Y : unsigned int { ... }; // unsigned enum
Even now, though, some simple validation can be achieved by using the enum as a variable or parameter type like this:
enum Fruit { Apple, Banana };
enum Fruit fruitVariable = Banana; // Okay, Banana is a member of the Fruit enu...