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How to drop columns using Rails migration
...
And make sure to do this inside up and down methods, not change, as explained in the answer by @Powers.
– XåpplI'-I0llwlg'I -
Aug 30 '13 at 5:32
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in iPhone App How to detect the screen resolution of the device
...eUploader: {
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How to list all the available keyspaces in Cassandra?
...tanding and creating the keyspaces from below resources.
Documentation:
https://docs.datastax.com/en/cql/3.1/cql/cql_reference/create_keyspace_r.html
https://www.i2tutorials.com/cassandra-tutorial/cassandra-create-keyspace/
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Is generator.next() visible in Python 3?
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Reset the database (purge all), then seed a database
...you've loaded data into, not the rest of them.)
There's a "dirty hack" at https://stackoverflow.com/a/14957893/4553442 to add a "de-seeding" operation similar to migrating up and down...
share
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im...
How do I bottom-align grid elements in bootstrap fluid layout
...AHfj/ for a working solution.
//for each element that is classed as 'pull-down', set its margin-top to the difference between its own height and the height of its parent
$('.pull-down').each(function() {
var $this = $(this);
$this.css('margin-top', $this.parent().height() - $this.height())
});
...
Modify/view static variables while debugging in Eclipse
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What is the order of precedence for CSS?
...v id="main">)
classes (ex.: .myclass), attribute selectors (ex.: [href=^https:]) and pseudo-classes (ex.: :hover)
elements (ex.: div) and pseudo-elements (ex.: ::before)
To compare the specificity of two combined selectors, compare the number of occurences of single selectors of each of the spe...
Forward function declarations in a Bash or a Shell script?
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Capture key press (or keydown) event on DIV element
... width: 90px;
height: 30px;
background: lightgrey;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="division" tabindex="0"></div>
Using JavaScript
var el = document.getElementById("division");
el.onkeydown =...