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Best way to create unique token in Rails?
...s might be a late response but in order to avoid using a loop you can also call the method recursively. It looks and feels slightly cleaner to me.
class ModelName < ActiveRecord::Base
before_create :generate_token
protected
def generate_token
self.token = SecureRandom.urlsafe_base64...
LINQPad [extension] methods [closed]
...rs to programming questions.
The second purpose of HyperLinq is to dynamically build queries:
// Dynamically build simple expression:
new Hyperlinq (QueryLanguage.Expression, "123 * 234").Dump();
// Dynamically build query:
new Hyperlinq (QueryLanguage.Expression, @"from c in Customers
where c.N...
Set Focus on EditText
...d set an OnFocusChangeListener for it. When it has lost focus, a method is called, which checks the value of the EditText with one in the database. If the return-value of the method is true, a toast is shown and the focus should get back on the EditText again. The focus should always get back on the...
How to set data attributes in HTML elements
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I am glad it worked. The .data() call is special - not only does it retrieve HTML5 data attributes it also attempts to evaluate/parse the attributes. So with an attribute like data-myval='{"hello":"world"}' when retrieved via .data() will return an Object wh...
How to programmatically send a 404 response with Express/Node?
...ion for this on the response object. Just chain it in somewhere before you call send.
res.status(404) // HTTP status 404: NotFound
.send('Not found');
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Is there a way to access the “previous row” value in a SELECT statement?
...t the previous value given the current one (EG, you want to order alphabetically) then I don't know of a way to do that in standard SQL, but most SQL implementations will have extensions to do it.
Here is a way for SQL server that works if you can order rows such that each one is distinct:
selec...
How to check if running as root in a bash script
... by using the root username. Nothing guarantees that the user with ID 0 is called root. It's a very strong convention that is broadly followed but anybody could rename the superuser another name.
I think the best way when using bash is to use $EUID, from the man page:
EUID Expands to the effecti...
How to disable HTML button using JavaScript?
I’ve read that you can disable (make physically unclickable) an HTML button simply by appending disable to its tag, but not as an attribute, as follows:
...
Programmatically trigger “select file” dialog box
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Note that I used visibility: hidden, instead of display: none. You cannot call the click event on a non-displayed file input.
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Setting up foreign keys in phpMyAdmin?
...ching foreign key column will get deleted (resp. updated) as well. This is called a cascade delete (resp. update[2]).
RESTRICT
A value cannot be updated or deleted when a row exists in a foreign key table that references the value in the referenced table. Similarly, a row cannot be deleted as long...