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How do I make a column unique and index it in a Ruby on Rails migration?
... short answer for old versions of Rails (see other answers for Rails 4+):
add_index :table_name, :column_name, unique: true
To index multiple columns together, you pass an array of column names instead of a single column name,
add_index :table_name, [:column_name_a, :column_name_b], unique: true...
Oracle “(+)” Operator
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Mr. Llama
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answered Oct 26 '10 at 4:54
OMG PoniesOMG Ponies
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htaccess Access-Control-Allow-Origin
I'm creating a script that loads externally on other sites. It loads CSS and HTML and works fine on my own servers.
9 Answe...
How to change the session timeout in PHP?
...nt a little is acceptable and you are fine with placing a lower bound instead of a strict limit to the duration, you can do so easily and without writing custom logic.
Convenience in relaxed environments: how and why
If your sessions are implemented with cookies (which they probably are), and if the...
Remove header and footer from window.print()
I am using window.print() for printing page, but I got header and footer contains page title, file path, page number and date. How to remove them?
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Resource interpreted as stylesheet but transferred with MIME type text/html (seems not related with
...kes an HTTP response.
Both requests and responses consist of a bunch of headers and a (sometimes optional) body with some content in it.
If there is a body, then one of the headers is the Content-Type which describes what the body is (is it an HTML document? An image? The contents of a form submis...
Row Offset in SQL Server
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shA.t
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answered Oct 9 '08 at 16:23
Brian KimBrian Kim
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jQuery - prevent default, then continue default
I have a form that, when submitted, I need to do some additional processing before it should submit the form. I can prevent default form submission behavior, then do my additional processing (it's basically calling Google Maps API and adding a few hidden fields to the form) -- and then I need the fo...
How do I fix "The expression of type List needs unchecked conversion…'?
..., then cast each element of the sf.getEntries() result to SyndEntry before adding it to your new list. Collections.checkedList does not do this checking for you—although it would have been possible to implement it to do so.
By doing your own cast up front, you're "complying with the warranty ter...
Generate random int value from 3 to 6
...ss than the number you use)
ABS changes negative results to positive
then add one to the result to eliminate 0 results (to simulate a dice roll)
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