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Want to find records with no associated records in Rails
...s).where( :friends => { :person_id => nil } )
For the hmt it's basically the same thing, you rely on the fact that a person with no friends will also have no contacts:
Person.includes(:contacts).where( :contacts => { :person_id => nil } )
Update
Got a question about has_one in the ...
How can I run a PHP script in the background after a form is submitted?
...er the path to the script are set as $_SERVER['argv'] variables that I can call within my script.
The email script then outputs to my log file using the >> and will output something like this:
[2011-01-07 11:01:26] Alert Notifications Sent for http://alerts.illinoisstate.edu/2049 (SCRIPT: 3...
what is reverse() in Django
...;!-- django <= 1.4 -->
<a href="{% url url_name %}">link which calls some_view</a>
<!-- django >= 1.5 or with {% load url from future %} in your template -->
<a href="{% url 'url_name' %}">link which calls some_view</a>
This will be rendered as:
<a href=...
How to sort an array by a date property
...ar i=this.length;i;){
var o = this[--i];
this[i] = [].concat(f.call(o,o,i),o);
}
this.sort(function(a,b){
for (var i=0,len=a.length;i<len;++i){
if (a[i]!=b[i]) return a[i]<b[i]?-1:1;
}
return 0;
});
for (var i=this.length;i;){
this[--...
Naming of ID columns in database tables
...me name - by using the table name prefix you can have a primary key column called table1ID and a foreign key column in another table called table1ID - and you KNOW that they are the same thing. I was taught this 20 years ago and its a practice that doesn't let you down.
– amel...
Is there a way to call a stored procedure with Dapper?
...
@Sam - that's what I call service!
– Ed Harper
May 11 '11 at 12:58
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Rotation methods deprecated, equivalent of 'didRotateFromInterfaceOrientation'?
...at we can assign to UIViewControllerTransitionCoordinator in order to be called when 'transition' to a new size finishes. Thanks.
...
java.lang.OutOfMemoryError: bitmap size exceeds VM budget - Android
... to make things worse, not better. You might need to add code that removes callbacks when your application redraws -- but again, there's not enough information here to say for sure.
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improve ...
Create the perfect JPA entity [closed]
...h will always be known when creating the entity. The rest should be set by calling the setter methods -- that's what they're for.
Avoid putting too many fields into constructors. Constructors should be convenient, and give basic sanity to the object. Name, Type and/or Parents are all typically usef...
How to return an empty ActiveRecord relation?
...create an empty array in Ruby I'd be really annoyed. Same thing here, basically.
– Purplejacket
Oct 1 '11 at 3:31
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