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Run a callback only if an attribute has changed in Rails
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Rails 5.1+
class Page < ActiveRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b9...
How do I concatenate or merge arrays in Swift?
...elligence extends to determining whether the b part of a is modified (therefore possibly eliding a copy of b during a.appendContentsOf(b))?
– Ephemera
Sep 20 '15 at 7:34
1
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Team city unmet requirement: MSBuildTools12.0_x86_Path exists
...from MSBuild Download.
edit: the answer link was broken. Here is the link for Microsoft Build Tools 2015 (most recently until today):
https://www.microsoft.com/en-us/download/details.aspx?id=48159
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Android Studio needs JDK 7 for Android-L mac
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This worked for me as well (after downloading JDK 7).
– user1440197
Jul 2 '14 at 21:14
7
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Mongoose populate after save
...r field on a newly saved object ... the only way I can find is to re-query for the objects I already have which I would hate to do.
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How to concatenate two MP4 files using FFmpeg?
... do not have the same parameters (width, height, etc), or are not the same formats/codecs, or if you want to perform any filtering. (You could re-encode just the inputs that don't match so they share the same codec and other parameters, then use the concat demuxer to avoid re-encoding the other inpu...
Setting PayPal return URL and making it auto return?
...lumn.
Under the Selling Online section, click the Update link in the row for Website Preferences.
The Website Payment Preferences page appears
Under Auto Return for Website Payments, click the On radio button to enable Auto
Return.
In the Return URL field, enter the URL to which you want...
What's wrong with using $_REQUEST[]?
...OST in a combined way. In fact that's what you almost always want to do:
for a plain idempotent request usually submitted via GET, there's the possibility the amount of data you want won't fit in a URL so it has be mutated to a POST request instead as a practical matter.
for a request that has a r...
nodejs get file name from absolute path?
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For those interested in removing extension from filename, you can use
https://nodejs.org/api/path.html#path_path_basename_path_ext
path.basename('/foo/bar/baz/asdf/quux.html', '.html');
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get and set in TypeScript
I'm trying to create get and set method for a property:
9 Answers
9
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