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How to create a unique index on a NULL column?
...to expand it to more such columns.
Suppose we the information represented by a table like this:
create table the_entity_incorrect
(
id integer,
uniqnull integer null, /* we want this to be "unique and nullable" */
primary key (id)
);
We can do it by putting uniqnull apart and adding a seco...
What is the most appropriate way to store user settings in Android application
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Could you please explain what you mean by sandboxed?
– Abhijit
Jul 3 '12 at 15:00
14
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What does map(&:name) mean in Ruby?
...hat as the method's block.
The Symbol#to_proc method was originally added by ActiveSupport but has been integrated into Ruby 1.8.7. This is its implementation:
class Symbol
def to_proc
Proc.new do |obj, *args|
obj.send self, *args
end
end
end
...
How do I copy folder with files to another folder in Unix/Linux? [closed]
...well and then the contents inside of it. My memory is this behavior varies by command and maybe event by OS a bit. Here's a reference with more info.
– OllieBrown
Jul 19 '18 at 17:02
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Refused to display in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'
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I found a better solution, maybe it can help somebody
replace "watch?v=" by "v/" and it will work
var url = url.replace("watch?v=", "v/");
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f...
Aligning rotated xticklabels with their respective xticks
... # here
plt.show()
(yticks already aligns the right edge with the tick by default, but for xticks the default appears to be "center".)
[1] You find that described in the xticks documentation if you search for the phrase "Text properties".
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How do I debug error ECONNRESET in Node.js?
... error on your TCP connection which causes the exception. You can see that by looking at the error code you posted in your edit, which confirms it.
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Are static class variables possible in Python?
..."static" variable
3
>>> t.i # we have overwritten Test.i on t by creating a new attribute t.i
5
>>> Test.i = 6 # to change the "static" variable we do it by assigning to the class
>>> t.i
5
>>> Test.i
6
>>> u = Test()
>>> u.i
6 # ch...
Insert space before capital letters
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This will find each occurrence of a lower case character followed by an upper case character, and insert a space between them:
s = s.replace(/([a-z])([A-Z])/g, '$1 $2');
For special cases when 2 consecutive capital letters occur (Eg: ThisIsATest) add additional code below:
s = s.replac...
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7
...ng edge rails, and rake hasn't caught up yet." But that case can be solved by either the "bundle exec" or the "edit Gemfile" approaches as well, and these approaches also solve the problem when there are no intrinsic compatibility issues, but only a muddled workflow history.
– ...