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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...
Angular ng-if=“” with multiple arguments
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I don't remember my android debug.keystore password
How can i see my debug.keystore password?
I entered my password 3 or 4 month ago and now i don't remember.
4 Answers
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In R, how to get an object's name after it is sent to a function?
... if it were a named vector that were being processed.
> lapply( list(a=4,b=5), function(x) {nm <- deparse(substitute(x)); strsplit(nm, '\\[')} )
$a
$a[[1]]
[1] "X" "" "1L]]"
$b
$b[[1]]
[1] "X" "" "2L]]"
> lapply( c(a=4,b=5), function(x) {nm <- deparse(substitute(x)); st...
Getting binary content in Node.js using request
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answered Feb 13 '13 at 13:46
GilZGilZ
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Is there a javadoc tag for documenting generic type parameters?
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240
It should be done just like this:
/**
* @param <T> This describes my type parameter
*/...
What is the difference between Android margin start/end and right/left?
... "start" and "end" concepts were added in API Level 17, as part of Android 4.2's support for RTL layouts.
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Forward function declarations in a Bash or a Shell script?
... John KugelmanJohn Kugelman
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Constructor initialization-list evaluation order
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answered Aug 7 '09 at 4:04
AraKAraK
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Get selected subcommand with argparse
...r')
>>> args = parser.parse_args(['-g', 'xyz', 'foo', '--count', '42'])
>>> args
Namespace(count='42', global='xyz', subparser_name='foo')
You can also use the set_defaults() method referenced just above the example I found.
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