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Rake just one migration
...r_migrations.rb'
=> ["YourMigrations"]
>> YourMigrations.up
=> etc... as the migration runs
>> YourMigration.down
More usefully this could be put into a rake task etc.
share
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im...
How can I see which Git branches are tracking which remote / upstream branch?
...| while read branch; do ... which doesn't need a FIFO and runs in the same order like the commands written.
– Daniel Böhmer
May 3 '18 at 7:21
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Java 8 stream's .min() and .max(): why does this compile?
...ompared against each other to find the minimum or maximum, in some optimal order that you don't need to worry too much about.
So the question is, of course, why is Integer::max accepted? After all it's not a comparator!
The answer is in the way that the new lambda functionality works in Java 8. ...
What's the difference between an object initializer and a constructor?
...
Object Initializers were something added to C# 3, in order to simplify construction of objects when you're using an object.
Constructors run, given 0 or more parameters, and are used to create and initialize an object before the calling method gets the handle to the created ob...
What should every JavaScript programmer know? [closed]
...
Not jQuery. Not YUI. Not (etc. etc.)
Frameworks may be useful, but they are often hiding the sometimes-ugly details of how JavaScript and the DOM actually work from you. If your aim is to be able to say “I know JavaScript”, then investing a lot o...
How can I update window.location.hash without jumping the document?
...owsers as follows:
if (history.pushState) {
// IE10, Firefox, Chrome, etc.
window.history.pushState(null, null, '#' + id);
} else {
// IE9, IE8, etc
window.location.hash = '#!' + id;
}
As observed by Gavin Brock, to capture the id back you will have to treat the string (which in t...
Heroku NodeJS http to https ssl forced redirect
...eed to concern ourselves with having local SSL certificates inside the app etc as you might if hosting in other environments. However, you should get a SSL Add-On applied via Heroku Add-ons first if using your own certificate, sub-domains etc.
Then just add the following to do the redirect from any...
How to find out client ID of component for ajax update/render? Cannot find component with expression
...ng chapter.
Note: if it happens to contain iteration index like :0:, :1:, etc (because it's inside an iterating component), then you need to realize that updating a specific iteration round is not always supported. See bottom of answer for more detail on that.
Memorize NamingContainer components a...
Prevent double submission of forms in jQuery
...ent so that duplicate submissions are harmless.
Eg, if the form creates an order, put a unique ID in the form. The first time the server sees an order creation request with that id, it should create it and respond "success". Subsequent submissions should also respond "success" (in case the client di...
Returning value from Thread
...DownLatch. The value array creation happens-before uiThread start (program order rule) which synchronizes-with the assignment of 2 to value[0] (thread start) which happens-before latch.countDown() (program order rule) which happens-before latch.await() (guarantee from CountDownLatch) which happens-b...