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How do I remove the Devise route to sign up?
...'m using Devise in a Rails 3 app, but in this case, a user must be created by an existing user, who determines what permissions he/she will have.
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What is the difference between gsub and sub methods for Ruby Strings
...u that it is not obvious! Java calls these replace and replaceAll. But Ruby has its roots in Perl which uses the g modifier. It's just one of those things.
– Ray Toal
Jul 21 '11 at 0:27
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Difference between scaling horizontally and vertically for databases [closed]
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Horizontal scaling means that you scale by adding more machines into your pool of resources whereas Vertical scaling means that you scale by adding more power (CPU, RAM) to an existing machine.
An easy way to remember this is to think of a machine on a server rack,...
CSV in Python adding an extra carriage return, on Windows
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Python 3:
As described by YiboYang, set newline=''
with open('output.csv', 'w', newline='') as f:
writer = csv.writer(f)
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As noted in the comments by CoDEmanX, set newline='\n'
with open('output.csv', 'w', newline='\n', encoding='...
How to get child element by class name?
...hen filter the one whose className equals 4:
var doc = document.getElementById("test");
var notes = null;
for (var i = 0; i < doc.childNodes.length; i++) {
if (doc.childNodes[i].className == "4") {
notes = doc.childNodes[i];
break;
}
}
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In Python, when should I use a function instead of a method?
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My general rule is this - is the operation performed on the object or by the object?
if it is done by the object, it should be a member operation. If it could apply to other things too, or is done by something else to the object then it should be a function (or perhaps a member of something e...
psycopg2: insert multiple rows with one query
...s the following error: [TypeError: sequence item 0: expected str instance, bytes found] run this command instead [args_str = ','.join(cur.mogrify("(%s,%s)", x).decode("utf-8") for x in tup)]
– mrt
Sep 3 '18 at 23:08
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Maven is not working in Java 8 when Javadoc tags are incomplete
...n a way that is easily linked back to the
source code.
This is enabled by default, and will run a whole lot of checks before generating Javadocs. You need to turn this off for Java 8 as specified in this thread. You'll have to add this to your maven configuration:
<profiles>
<profile...
When do we need to set ProcessStartInfo.UseShellExecute to True?
...tandardOutput=true, it seems to me you can still redirect standard output by doing process.Arguments= "cmd /c dir >c:\\crp\\a.a". Likewise from a run dialog box you can do cmd /c dir>c:\crp\a.a
– barlop
Apr 24 '16 at 22:51
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Return value in a Bash function
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$(...) captures the text sent to stdout by the command contained within. return does not output to stdout. $? contains the result code of the last command.
fun1 (){
return 34
}
fun2 (){
fun1
local res=$?
echo $res
}
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