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How do you write a migration to rename an ActiveRecord model and its table in Rails?
... add_index :old_table_name, :column_name
end
end
And rename your files etc, manually as other answers here describe.
See: http://api.rubyonrails.org/classes/ActiveRecord/Migration.html
Make sure you can rollback and roll forward after you write this migration. It can get tricky if you get some...
More elegant “ps aux | grep -v grep”
...command, e.g.
ps u -C gnome-terminal
(or search through /proc with find etc.)
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Find and restore a deleted file in a Git repository
...he specified commit, so ~1 is the commit before, ~2 is two commits before, etc
– Nils Luxton
Sep 10 '12 at 15:07
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Equivalent of *Nix 'which' command in PowerShell?
....ps1. Using this answer, however, gives me the whole path (C:\Users\blah\etc\scripts\okta.ps1). So +1 from me.
– s-k-y-e---c-a-p-t-a-i-n
May 30 '19 at 18:40
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IPC performance: Named Pipe vs Socket
...(processAin, processAout, processBin, processBout, processCin, processCout etc)
Or you can go hybrid as always :)
Named pipes are quite easy to implement.
E.g. I implemented a project in C with named pipes, thanks to standart file input-output based communication (fopen, fprintf, fscanf ...) it ...
How to build & install GLFW 3 and use it in a Linux project
...eone else, should propose a solution which does not just install lib files etc into the system default directories as these should be managed by package managers such as apt, and doing so may cause a conflict and break your package management system.
See the new "2020 answer" for an alternative solu...
Replacement for “rename” in dplyr
...re is that data is copied. No big deal if this is for playing, i.e. mtcars etc ... but quite dramatic if you deal with substantial data. check dplyr:::changes(mtcars, dat)
– Romain Francois
Feb 2 '14 at 0:10
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How to analyze a java thread dump?
...rces. I need to do more study on it, but if you have files open, sockets, etc... related to an objects methods, then the finalizer is going to work on freeing those items up as well.
What is the figure in squared parenthesis after Object.wait in the
thread dump?
It is a pointer in memory to...
Should I write script in the body or the head of the html? [duplicate]
... the rendering, they also may remove things that dont need to be rendered, etc.
Some of the more modern browsers violate this rule by not blocking on the downloading the scripts (ie8 was the first) but overall the download isn't the majority of the time spent blocking.
Check out Even Faster Websi...
How to set my default shell on Mac?
...
1. sudo nano /etc/shells
2. add /usr/local/bin/fish to your list of shells
3. chsh -s /usr/local/bin/fish
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