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How to delete migration files in Rails 3
...rsion before the one I want to delete.
Delete the migration file manually.
If there are pending migrations (i.e., the migration I removed was not the last one), I just perform a new rake db:migrate again.
If your application is already on production or staging, it's safer to just write another mig...
Alternate background colors for list items
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If you want to do this purely in CSS then you'd have a class that you'd assign to each alternate list item. E.g.
<ul>
<li class="alternate"><a href="link">Link 1</a></li>
<li><...
What's the difference of ContentType and MimeType
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Why we use 2 different naming for
(almost the same) thing? Is
"Content-Type" just a name used in
browser requests, and with very little
use outside it?
What's the main difference between the
each one, and when is right to ca...
JavaScript: how to change form action attribute value based on selection?
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If you design for mobile devices it would be better to change action "on submit" for performance issues. Check my answer below.
– trante
Dec 13 '13 at 13:13
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How to select the rows with maximum values in each group with dplyr? [duplicate]
...n the comments, slice may be preferred here as per @RoyalITS' answer below if you strictly only want 1 row per group. This answer will return multiple rows if there are multiple with an identical maximum value.
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How to make the division of 2 ints produce a float instead of another int?
...y automatically cast to a float by the compiler because the rules say that if either operand is of floating point type then the operation will be a floating point operation, even if the other operand is integral. Java Language Specification, §4.2.4 and §15.17
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Inserting a Link to a Webpage in an IPython Notebook
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Its wierd, any of these options doesnt work, if the text in Markdown cell Starts with a tab. ie if there is more than 4 spaces in the starting of the cell, then it simply does'nt work
– sjd
Jul 17 at 6:21
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How do I get my Python program to sleep for 50 milliseconds?
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Note that if you rely on sleep taking exactly 50 ms, you won't get that. It will just be about it.
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Need to remove href values when printing in Chrome
...xed a similar issue for me a few weeks back; might help you, but that's a different issue
– Andrew
Apr 18 '17 at 19:06
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Assigning variables with dynamic names in Java
...ariables with static names.
1 - That statement is slightly inaccurate. If you use BCEL or ASM, you can "declare" the variables in the bytecode file. But don't do it! That way lies madness!
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