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How does Rails keep track of which migrations have run for a database?
...chema_migrations.
For example, running a migration file named 20120620193144_create_users.rb will insert a new row with a version of 20120620193144 into the schema_migrations table.
You are free at any point to introduce migrations with earlier versions. Rails will always run any new migrations fo...
How to use a WSDL file to create a WCF service (not make a call)
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edited Apr 19 '16 at 14:55
Luke Girvin
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Match multiline text using regular expression
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4 Answers
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How to add percent sign to NSString
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944
The code for percent sign in NSString format is %%. This is also true for NSLog() and printf() ...
Using the slash character in Git branch name
...basically this:
% cd .git/refs/heads
% ls -l
total 0
-rw-rw-r-- 1 jhe jhe 41 2009-11-14 23:51 labs
-rw-rw-r-- 1 jhe jhe 41 2009-11-14 23:51 master
% mkdir labs
mkdir: cannot create directory 'labs': File exists
You're getting the equivalent of the "cannot create directory" error.
When you h...
Use of 'use utf8;' gives me 'Wide character in print'
...from this:
$ perl -E 'say join ":", map { ord } split //, "鸡\n";'
233:184:161:10
The first three bytes make up your character, the last one is the line-feed.
The call to print sends these four characters to STDOUT. Your console then works out how to display these characters. If your console is...
Get epoch for a specific date using Javascript
... majgis
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answered Jul 29 '10 at 22:19
Michael MrozekMichael Mrozek
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What is the difference between named and positional parameters in Dart?
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edited Mar 11 '19 at 8:54
onmyway133
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