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Converting an integer to a hexadecimal string in Ruby
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You can give to_s a base other than 10:
10.to_s(16) #=> "a"
Note that in ruby 2.4 FixNum and BigNum were unified in the Integer class.
If you are using an older ruby check the documentation of FixNum#to_s and BigNum#to_s
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Eclipse/Java code completion not working
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Try restoring the default options in 'Windows > Preferences > Java > Editor > Content Assist > Advanced'
An example of the kind of data you see in this preference screen, however not necessarily what you currently have.
(From Vadim in this blog post " C...
How to escape os.system() calls?
...ng shell pipe line
-------------------------
output=`dmesg | grep hda`
==>
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
output = p2.communicate()[0]
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Random record in ActiveRecord
... Model.offset(offset).first
# Rails 3
rand_record = Model.first(:offset => offset)
To be honest, I've just been using ORDER BY RAND() or RANDOM() (depending on the database). It's not a performance issue if you don't have a performance issue.
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Change bundle identifier in Xcode when submitting my first app in IOS
...reation + project name.
This is similar to what you see in the Project > Summary screen.
But you can change this in the Project > Info screen. (This is the Info.plist.)
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how to “reimport” module to python then code be changed after import
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In addition to gnibbler's answer:
This changed in Python 3 to:
>>> import imp
>>> imp.reload(foo)
As @onnodb points out, imp is deprecated in favor of importlib since Python 3.4:
>>> import importlib
>>> importlib.reload(foo)
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Using Default Arguments in a Function
...ams)) {
// params could be an array of properties like array('x' => 'x1', 'y' => 'y1')
} else if (func_num_args() == 3) {
$args = func_get_args();
// 3 parameters passed
} else if (func_num_args() == 5) {
$args = func_get_args();
// 5 parameters...
Ruby / Rails - Change the timezone of a Time, without changing the value
... need to subtract the offset after you convert it, as in:
1.9.3p194 :042 > utc_time = Time.now.utc
=> 2013-05-29 16:37:36 UTC
1.9.3p194 :043 > local_time = utc_time.in_time_zone('America/New_York')
=> Wed, 29 May 2013 12:37:36 EDT -04:00
1.9.3p194 :044 > desired_time = local_time-lo...
How do you find the row count for all your tables in Postgres
...ou can grab that one like this:
SELECT
nspname AS schemaname,relname,reltuples
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE
nspname NOT IN ('pg_catalog', 'information_schema') AND
relkind='r'
ORDER BY reltuples DESC;
Which of these queries is better to use i...
Convert integer into its character equivalent, where 0 => a, 1 => b, etc
...ant uppercase letters, replace 97 with 65 (uppercase 'A'). Note that if n > 25, you will get out of the range of letters.
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