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How to extract URL parameters from a URL with Ruby or Rails?
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Good find. If you have simple params (non-nested) and are performance sensitive, Rack::Utils.parse_query might be of interest. The code is worth reading: github.com/rack/rack/blob/master/lib/rack/utils.rb
– Levi
...
How to check certificate name and alias in keystore files?
I have a bunch of .keystore files and need to find one with specific CN and alias. Is there a way to do it with keytool, jarsigner or some other tool? I found a way to check if specific keystore was used to sign a specific apk, but I also need to get the alias and certificate name in each of the fil...
Rails has_and_belongs_to_many migration
...rom the docs:
There is also a generator which will produce join tables if JoinTable
is part of the name:
Your migration file (note the :id => false; it's what prevents the creation of a primary key):
Rails 3
class CreateRestaurantsUsers < ActiveRecord::Migration
def self.up
c...
Correct use of flush() in JPA/Hibernate
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if flush() sends data to the database? what happens if an exception is thrown after that? Will the entity manager rollback everything? even the data written in the first flush?
– Jaime Hablutzel
...
ng-repeat :filter by single field
...re filtering by color. This method is more compact, which might be useful if you want to search by multiple properties, and you'd rather not have a long object in the HTML: filter:{ color: '...', size: '...', ...}
– Mark Rajcok
Feb 6 '13 at 16:21
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How to select the row with the maximum value in each group
...solution:
require(data.table) ## 1.9.2
group <- as.data.table(group)
If you want to keep all the entries corresponding to max values of pt within each group:
group[group[, .I[pt == max(pt)], by=Subject]$V1]
# Subject pt Event
# 1: 1 5 2
# 2: 2 17 2
# 3: 3 5 ...
@OneToMany List vs Set difference
Is there any difference if I use
2 Answers
2
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How to convert byte array to string [duplicate]
...lts of this will vary depending on how the operating system is configured. If you know what encoding the string really is you should use that one instead.
– Wolfgang
Nov 5 '15 at 15:18
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How disable Copy, Cut, Select, Select All in UITextView
...o allow:
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (action == @selector(paste:))
return NO;
return [super canPerformAction:action withSender:sender];
}
Also see UIResponder
share
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HTML5 textarea placeholder not appearing
...date (2020)
This is not true anymore, according to the HTML5 parsing spec:
If the next token is a U+000A LINE FEED (LF) character token,
then ignore that token and move on to the next one. (Newlines
at the start of textarea elements are ignored as an authoring
convenience.)
You might still have ...