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How can I time a code segment for testing performance with Pythons timeit?
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280
You can use time.time() or time.clock() before and after the block you want to time.
import t...
How to get first and last day of the week in JavaScript
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20 Answers
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SQL - Update multiple records in one query
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Try either multi-table update syntax
UPDATE config t1 JOIN config t2
ON t1.config_name = 'name1' AND t2.config_name = 'name2'
SET t1.config_value = 'value',
t2.config_value = 'value2';
Here is SQLFiddle demo
or conditional update
UPDATE config
SET config_value = CASE con...
Truncate Two decimal places without rounding
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21 Answers
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How do you print in Sublime Text 2
Sublime Text 2 seems like a great editor. I just started using it a week ago in eval mode and it doesn't seem to have any printing functionality. This seems preposterous to me, but I can't find it anywhere.
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javascript remove “disabled” attribute from html input
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201
Set the element's disabled property to false:
document.getElementById('my-input-id').disabled...
Mounting multiple volumes on a docker container?
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272
Pass multiple -v arguments.
For instance:
docker -v /on/my/host/1:/on/the/container/1 \
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Two way sync with rsync
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RazerM
4,0751818 silver badges2525 bronze badges
answered May 29 '10 at 21:50
alexalex
5,07611 gold badge212...
Determine what attributes were changed in Rails after_save callback?
... through Rails 5.1 (but is deprecated in 5.1 and has breaking changes in 5.2). You can read about the change in this pull request.
In your after_update filter on the model you can use _changed? accessor. So for example:
class SomeModel < ActiveRecord::Base
after_update :send_notification_aft...
How to write LaTeX in IPython Notebook?
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edited Jun 18 '14 at 12:36
katahdin
34955 silver badges1616 bronze badges
answered May 21 '13 at 1:1...