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How to rollback just one step using rake db:migrate
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Best way is running Particular migration again by using down or up(in rails 4. It's change)
rails db:migrate:up VERSION=timestamp
Now how you get the timestamp.
Go to this path
/db/migrate
Identify migration file you want to revert.pick the timestamp from that...
jQuery show for 5 seconds then hide
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
Remove first 4 characters of a string with PHP
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If you’re using a multi-byte character encoding and do not just want to remove the first four bytes like substr does, use the multi-byte counterpart mb_substr. This does of course will also work with single-byte strings.
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Printing all global variables/local variables?
...rgc = 6*7; //Break here.
return 0;
}
argc and argv won't be shown by info locals. The message will be "No locals."
Reference: info locals command.
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LD_LIBRARY_PATH vs LIBRARY_PATH
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LIBRARY_PATH is used by gcc before compilation to search directories containing static and shared libraries that need to be linked to your program.
LD_LIBRARY_PATH is used by your program to search directories containing shared libraries after i...
Breaking/exit nested for in vb.net
...inline the function call. All function calls (assuming they're not inlined by the compiler) have the overhead of the prologue and epilogue to update the base stack pointer (as well as do other things like call destructors and do garbage collection if the language supports it). This is often minutia ...
What does @: (at symbol colon) mean in a Makefile?
... This is an excellent explaination of what this does, but do you by any chance know why you would do this in a makefile?
– Charles Keepax
Oct 13 '12 at 20:50
8
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Inno Setup for Windows service?
... }
}
Basically you can have your service to install/uninstall on its own by using ManagedInstallerClass as shown in my example.
Then it's just matter of adding into your InnoSetup script something like this:
[Run]
Filename: "{app}\MYSERVICE.EXE"; Parameters: "--install"
[UninstallRun]
Filename:...
What does an underscore in front of an import statement mean?
...nly side effect that a package can make, without being actually called, is by creating package-level variables (public or private) and inside it's init function.
Note: There is a trick to run a function before even init function. We can use package level variables for this by initializing them usin...
What do @, - and + do as prefixes to recipe lines in Make?
...ardized) generalization of the de facto (non-standardized) mechanism whereby a command line containing ${MAKE} or $(MAKE) is executed under make -n.
(@ is discussed in §5.2 of the GNU Make manual; - is described in §5.5; and §5.7.1 mentions the use of +.)
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