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how to generate migration to make references polymorphic
...ass AddImageableToProducts < ActiveRecord::Migration
def up
change_table :products do |t|
t.references :imageable, polymorphic: true
end
end
def down
change_table :products do |t|
t.remove_references :imageable, polymorphic: true
end
end
end
...
How to make the corners of a button round?
...wrap_content"
android:layout_height="wrap_content"
android:text="@string/Shape"
android:background="@drawable/shape"/>
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Using Vim's persistent undo?
...eep undo history across sessions by storing it in a file
if has('persistent_undo')
let myUndoDir = expand(vimDir . '/undodir')
" Create dirs
call system('mkdir ' . vimDir)
call system('mkdir ' . myUndoDir)
let &undodir = myUndoDir
set undofile
endif
...
Serialize form data to JSON [duplicate]
...
You can do this:
function onSubmit( form ){
var data = JSON.stringify( $(form).serializeArray() ); // <-----------
console.log( data );
return false; //don't submit
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
...
How to include file in a bash shell script
...t . is POSIX compliant whereas source isn't
– Mathieu_Du
Feb 20 '15 at 19:38
But here source is not exactly the includ...
Setting global styles for Views in Android
...ne a theme that overrides the android default for that widget, or define a string resource and reference it in each widget
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Java: Static vs inner class [duplicate]
...c int x; // allowed here
}
}
class Test
{
public static void main(String… str)
{
A a = new A();
// Non-Static Inner Class
// Requires enclosing instance
A.B obj1 = a.new B();
// Static Inner Class
// No need for reference of object to...
Difference Between ViewData and TempData?
..., one way only
It’s life lies only during the current request
If passing string then no need to typecast
If passing object then you need to typecast it but before that you need to check if it is not null
Its a property on ControllerBase, which is the parent of Controller class
TempData:
TempD...
do..end vs curly braces for blocks in Ruby
... I see no reason that an editor would have trouble finding a 2/3 character string versus a single character. Though there is the argument that most editors already match braces, whereas do ... end is a special case which requires language specific logic.
– Chinoto Vokro
...
Copy / Put text on the clipboard with FireFox, Safari and Chrome
...his (saying this because this thread is almost 9 years old!)
function copyStringToClipboard (string) {
function handler (event){
event.clipboardData.setData('text/plain', string);
event.preventDefault();
document.removeEventListener('copy', handler, true);
}
doc...