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Rails migration: t.references with alternative name?
...and above you can add the foreign key in the migration in the create_table block like this:
create_table :courses do |t|
t.string :name
t.references :transferrable_as, foreign_key: { to_table: 'courses' }
t.references :same_as, foreign_key: { to_table: 'courses' }
t.timestamps
end
...
Using CSS how to change only the 2nd column of a table
...h comment like you have here, made it easy for them to know which selector block was for which column from the left. Again not the most elegant and efficient way, but it worked!
– Eric Bishard
May 19 '17 at 22:30
...
How to save a BufferedImage as a File
.../ handle exception
}
It's important to surround the write call with a try block because, as per the API, the method throws an IOException "if an error occurs during writing"
Also explained are the method's objective, parameters, returns, and throws, in more detail:
Writes an image using an arbitra...
Pan & Zoom Image
...
Before comments get blocked for "Nice Job!" or "Great Work" I just want to say Nice Job and Great Work. This is a WPF gem. It blows the wpf ext zoombox out of the water.
– Jesse Seger
May 12 '14 at 18:54
...
Get/pick an image from Android's built-in Gallery app programmatically
...EAD BECAUSE NETWORK REQUEST WILL BE MADE THAT WILL BE A LONG PROCESS & BLOCK UI
// IF CALLED IN UI THREAD
public void run() {
try {
Bitmap bitmap = android.provider.MediaStore.Images.Media.getBitmap(getContentResolver()...
Is there any way to kill a Thread?
....g. this comes in handy to easily terminate helper "threads" which execute blocking I/O
The conversion is trivial: In related code replace all threading.Thread with multiprocessing.Process and all queue.Queue with multiprocessing.Queue and add the required calls of p.terminate() to your parent proce...
Asynchronous shell commands
.... So here is a summary:
& puts the job in the background.
Makes it block on attempting to read input, and
Makes the shell not wait for its completion.
disown removes the process from the shell's job control, but it still leaves it connected to the terminal.
One of the results is that the ...
d3 axis labeling
...components that you can use to assemble charts. You are given the building blocks, an axis component, data join, selection and SVG. It's your job to put them together to form a chart!
If you want a conventional chart, i.e. a pair of axes, axis labels, a chart title and a plot area, why not have a l...
When is JavaScript's eval() not evil?
... This is such general advice that it could be applied to literally any block of code that exists. It really doesn't add anything to this question; in particular, it doesn't help anyone coming here determine whether or not their particular usage is problematic or not.
– jpmc...
How to make a HTML Page in A4 paper size page(s)?
...ackground: rgb(204,204,204);
}
page {
background: white;
display: block;
margin: 0 auto;
margin-bottom: 0.5cm;
box-shadow: 0 0 0.5cm rgba(0,0,0,0.5);
}
page[size="A4"] {
width: 21cm;
height: 29.7cm;
}
page[size="A4"][layout="portrait"] {
width: 29.7cm;
height: 21...