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Rails Observer Alternatives for 4.0
...there:
module MyConcernModule
extend ActiveSupport::Concern
included do
after_save :do_something
end
def do_something
...
end
end
Next, include that in the models you wish to run the after_save in:
class MyModel < ActiveRecord::Base
include MyConcernModule
end
Dependi...
How do you use a variable in a regular expression?
... JavaScript and I'm thinking that using a regex would be most terse way to do it. However, I can't figure out how to pass a variable in to a regex. I can do this already which will replace all the instances of "B" with "A" .
...
Why are empty catch blocks a bad idea? [closed]
...nd then continuing execution. Occasionally this may be the right thing to do, but often it's a sign that a developer saw an exception, didn't know what to do about it, and so used an empty catch to silence the problem.
It's the programming equivalent of putting black tape over an engine warning ...
How to pass parameters in GET requests with jQuery
...uld I be passing query string values in a jQuery Ajax request? I currently do them as follows but I'm sure there is a cleaner way that does not require me to encode manually.
...
How should you build your database from source control?
...ng objects from a stable, finalized test environment?
Automation for both. Do NOT copy data between the environments
How do you deal with potential differences between test and production environments in deployment scripts?
Use templates, so that actually you would produce different set of scripts f...
What specific productivity gains do Vim/Emacs provide over GUI text editors?
...e months now (for editing configuration files while in my terminal), but I don't think I could stand it for my normal, every day work of writing web applications, which I do with a GUI text editor (which one isn't important).
...
How do I undo the most recent local commits in Git?
...
Undo a commit and redo
$ git commit -m "Something terribly misguided" # (1)
$ git reset HEAD~ # (2)
<< edit files as necessary >> # (...
Trying to embed newline in a variable in bash [duplicate]
... characters "\n" as a new line.
var="a b c"
first_loop=true
for i in $var
do
p="$p\n$i" # Append
unset first_loop
done
echo -e "$p" # Use -e
Avoid extra leading newline
var="a b c"
first_loop=1
for i in $var
do
(( $first_loop )) && # "((...))" is bash spe...
How do you roll back (reset) a Git repository to a particular commit? [duplicate]
... state so that the remote repository also points to the rolled back commit do: git push <reponame> -f (credited user)
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How to express a NOT IN query with ActiveRecord/Rails?
...
@NewAlexandria is right, so you'd have to do something like Topic.where('id NOT IN (?)', (actions.empty? ? '', actions). It would still break on nil, but I find that the array you pass in is usually generated by a filter that will return [] at the very least and neve...