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Ruby on Rails: How can I revert a migration with rake db:migrate?
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I'm getting an UnknownMigrationVersionError but I figured out it's because my migrations are inside db/migrate/main , does anybody know a workaround for this to have db:migrate:down look inside that specific directory or the migrate subdirectories?
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Eclipse Workspaces: What for and why?
... group of related maven projects into a workspace lets you develop and see errors in real time. If not a workspace what else would you suggest? An RCP application can be a different beast depending on what its used for but in the true IDE sense I don't know what would be a better solution than a wor...
In plain English, what does “git reset” do?
...ert is a command to "fix-commited mistake".
It means if we have made some error in some change and commited and pushed the same to git repo, then git revert is the solution. And if in case we have identified the same error before pushing/commiting, we can use git reset to fix the issue.
I hope it...
Does a method's signature in Java include its return type?
...e second line:
public char myMethod(int param) {}
will give you can error: method is already defined in class, which further confirms the above statement.
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The command rbenv install is missing
...all ruby 2.0.0-p247 using
$ rbenv install 2.0.0-p247
but I received the error message
rbenv: no such command 'install'
All I had to do was to run
$ exec $SHELL -l
and that fixed the problem.
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How do I save a UIImage to a file?
...?.write(to: filePath, options: .atomic)
} catch {
// Handle the error
}
}
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How can I use a search engine to search for special characters? [closed]
...s, such as finding out what the variable "$-" is in perl, or searching for error output that is loaded with special characters.
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Linux日志管理Rsyslog入门 - C/C++ - 清泛网移动版 - 专注C/C++及内核技术
.../log/cron
# Everybody gets emergency messages
*.emerg *
# Save news errors of level crit and higher in a special file.
uucp,news.crit /var/log/spooler
# Save boot messages also to boot.log
local7.* /var/log/boot.log
其中涉及两个概念：Facility和Severity，中文的意思大致...
Importing variables from another file?
...t, but it seems like python can't find the file1, because I'm getting this error: ImportError: No module named file1
– Hilder Vitor Lima Pereira
May 29 '15 at 23:52
4
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How can I check whether an array is null / empty?
...to check for null first as you have done, to avoid a possible null pointer error
– Bill Milagro
Jan 15 at 5:31
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