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    <p>This parameter was added to forms in order to force Internet Explorer (5, 6, 7 <em>and</em> 8) to encode its parameters as unicode.</p> <p>Specifically, this bug can be triggered if the user switches the browser's encoding to Latin-1. To understand why a user would decide to do something seemingly so crazy, check out <a href="http://www.google.com/search?sourceid=chrome&amp;ie=UTF-8&amp;q=diamond%20with%20a%20question%20mark%20in%20it" rel="noreferrer">this google search</a>. Once the user has put the web-site into Latin-1 mode, if they use characters that can be understood as both Latin-1 and Unicode (for instance, é or ç, common in names), Internet Explorer will encode them in Latin-1.</p> <p>This means that if a user searches for "Ché Guevara", it will come through incorrectly on the server-side. In Ruby 1.9, this will result in an encoding error when the text inevitably makes its way into the regular expression engine. In Ruby 1.8, it will result in broken results for the user.</p> <p>By creating a parameter that can only be understood by IE as a unicode character, we are forcing IE to look at the accept-charset attribute, which then tells it to encode all of the characters as UTF-8, even ones that can be encoded in Latin-1.</p> <p>Keep in mind that in Ruby 1.8, it is extremely trivial to get Latin-1 data into your UTF-8 database (since <em>nothing</em> in the entire stack checks that the bytes that the user sent at any point are valid UTF-8 characters). As a result, it's extremely common for Ruby applications (and PHP applications, etc. etc.) to exhibit this user-facing bug, and therefore extremely common for users to try to change the encoding as a palliative measure.</p> <p>All that said, when I wrote this patch, I didn't realize that the name of the parameter would ever appear in a user-facing place (it does with forms that use the GET action, such as search forms). Since it does, we will rename this parameter to <code>_e</code>, and use a more innocuous-looking unicode character.</p>
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    1. POWhat is the _snowman param in Ruby on Rails 3 forms for?
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    1. USAndrew Marshall
    1. USYehuda Katz
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    1. COIf this ends up a transparent parameter like _method, it'll probably be a lot less confusing. What a crazy thing to have to fix, though.
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      1. UStadman
    2. COThanks for the detailed response Yehuda - though I think keeping the snowman is the best outcome its probably one of those stupid things 'enterprises' will pick on - 'what the hell is this snowman thing?!? this is a business, not a game!'.. Ugh.
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      1. USMatthew Savage
    3. CO@Matthew, oddly enough you're right. But I do feel like the solution is pretty impressive.
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      1. USJP Silvashy
 

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