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How do I run a rake task from Capistrano?
...ilding a generic version of Mirek Rusin's answer:
desc 'Invoke a rake command on the remote server'
task :invoke, [:command] => 'deploy:set_rails_env' do |task, args|
on primary(:app) do
within current_path do
with :rails_env => fetch(:rails_env) do
rake args[:command]
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How to calculate the number of occurrence of a given character in each row of a column of strings?
... Sorry I was unclear. I was actually responding to tim riffe and telling him that his function threw an error with the problem posed. He may have used your redefinition of the problem but he didn't say so.
– IRTFM
Sep 14 '12 at 20:14
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How can I check if a single character appears in a string?
...indexOf() uses loop internally. None of the answers gives correct solution and if someone dares to ask a new question, people declare it Duplicate. Really disappointing ;(
– Prashant Prabhakar Singh
Mar 3 '17 at 7:22
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How to Define Callbacks in Android?
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In many cases, you have an interface and pass along an object that implements it. Dialogs for example have the OnClickListener.
Just as a random example:
// The callback interface
interface MyCallback {
void callbackCall();
}
// The class that takes the c...
Find rows with multiple duplicate fields with Active Record, Rails & Postgres
...find records with duplicate values across multiple columns using Postgres, and Activerecord?
5 Answers
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How can I generate an MD5 hash?
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The compute the hash by doing one of:
Feed the entire input as a byte[] and calculate the hash in one operation with md.digest(bytes).
Feed the MessageDigest one byte[] chunk at a time by calling md.update(bytes). When you're done adding input bytes, calculate the hash with
md.digest().
The by...
How can I show hidden files (starting with period) in NERDTree?
...den=1
For more detail, access the NERDTree help file :help NERD_tree.txt and search for "hidden".
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Send response to all clients except sender
... use socket.emit back who sends it or you can group the conncected clients and do @Crashalot
– ujwal dhakal
Nov 19 '15 at 18:36
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postgres: upgrade a user to be a superuser?
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and how can i detect if myuser is currently superuser?
– masterweily
May 10 '13 at 8:18
20
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Django set default form values
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And how is that variable initial passed to the actual form? In the actual form model, do we have to write as a parameter/argument?
– mgPePe
May 4 '11 at 12:03
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