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How to rollback just one step using rake db:migrate
...k
Roll back the n most recent migrations:
rake db:rollback STEP=n
You can find full instructions on the use of Rails migration tasks for rake on the Rails Guide for running migrations.
Here's some more:
rake db:migrate - Run all migrations that haven't been run already
rake db:migrate VERS...
XML schema or DTD for logback.xml?
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However, due to extreme flexibility of the Logback configuration, Schema cannot support all possible configuration options.
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How can I calculate the time between 2 Dates in typescript
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@KenLyon From MDN getTime documentation: You can use this method to help assign a date and time to another Date object. This method is functionally equivalent to the valueOf() method.
– PhoneixS
Mar 6 '18 at 10:35
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How to determine function name from inside a function
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You can use ${FUNCNAME[0]} in bash to get the function name.
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Rails: convert UTC DateTime to another time zone
...ne)
Example:
zone = ActiveSupport::TimeZone.new("Central Time (US & Canada)")
Time.now.in_time_zone(zone)
or just
Time.now.in_time_zone("Central Time (US & Canada)")
You can find the names of the ActiveSupport time zones by doing:
ActiveSupport::TimeZone.all.map(&:name)
# or for...
LD_LIBRARY_PATH vs LIBRARY_PATH
... successfully compiled and linked.
EDIT:
As pointed below, your libraries can be static or shared. If it is static then the code is copied over into your program and you don't need to search for the library after your program is compiled and linked. If your library is shared then it needs to be dyn...
Heroku free account limited?
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Heroku provides, for free, 1 dyno. A dyno is an instance of your application running and responding to requests. If each instance of your application can serve each request in 100ms, then you get 600 requests/minute with the free account.
Your application code and its assets (the slug) are lim...
How to avoid merge-commit hell on GitHub/BitBucket
...us unless the current
HEAD is already up-to-date or the merge can be resolved as a
fast-forward.
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Add a duration to a moment (moment.js)
...arted with. It's just returned as a convenience for method chaining.
You can work around this behavior by cloning the moment, as described here.
Also, you cannot just use == to test. You could format each moment to the same output and compare those, or you could just use the .isSame() method.
Y...
Only one expression can be specified in the select list when the subquery is not introduced with EXI
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You can't return two (or multiple) columns in your subquery to do the comparison in the WHERE A_ID IN (subquery) clause - which column is it supposed to compare A_ID to? Your subquery must only return the one column needed for th...