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How to access outer class from an inner class?
...native to `with_metaclass`
class Outer(with_metaclass(OuterMeta)):
def foo(self):
return "I'm outer class!"
class Inner(object):
outer = None # <-- by default it's None
def bar(self):
return "I'm inner class"
print(Outer.Inner.outer)
>>> &...
Count, size, length…too many choices in Ruby?
... Something to consider with this is counter_cache. If have a table, foo, and it has_many bar, you'll have a column in foo named bars_count that gets updated anytime a bar is created / destroyed. Using foo.bars.size is what checks that column (without actually querying any bars). foo.bars.coun...
What are the best practices to follow when declaring an array in Javascript?
...ed to create a different object.
(function () {
"use strict";
var foo,
bar;
//don't do this, it's a bad idea
function Array() {
alert('foo');
}
foo = new Array();
bar = [];
}());
In my example code, I've kept the Array function hidden from the rest o...
What is the difference between include and extend in Ruby?
...s they don't clash
It gives Klazz access to Mod's module variables, e.g. @@foo or @@bar
raises ArgumentError if there are cyclic includes
Attaches the module as the caller's immediate ancestor (i.e. It adds Mod to Klazz.ancestors, but Mod is not added to the chain of Klazz.superclass.superclass.supe...
Foreign keys in mongo?
...Mongoid::Document
field :name
has_many :scores
end
Edit:
> db.foo.insert({group:"phones"})
> db.foo.find()
{ "_id" : ObjectId("4df6539ae90592692ccc9940"), "group" : "phones" }
{ "_id" : ObjectId("4df6540fe90592692ccc9941"), "group" : "phones" }
>db.foo.find({'_id...
Should I use alias or alias_method?
...dict: Use alias_method - it gives you a ton more flexibility.
Usage:
def foo
"foo"
end
alias_method :baz, :foo
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When do I need to use a semicolon vs a slash in Oracle SQL?
....0 - Production
With the Partitioning and OLAP options
SQL> drop table foo;
Table dropped.
SQL> /
drop table foo
*
ERROR at line 1:
ORA-00942: table or view does not exist
In this case one actually notices the error.
But assuming there is a SQL script like this:
drop table...
Must Dependency Injection come at the expense of Encapsulation?
...er of the dependency must know both that the object in question requires a Foo, and the provider has to have a way of providing the Foo to the object.
Classically this latter case is handled as you say, through constructor arguments or setter methods. However, this is not necessarily true - I know...
jQuery event to trigger action when a div is made visible
...he clearInterval() upon successful call-out.
Here's an example:
function foo() {
$('.visibilityCheck').each(function() {
if ($(this).is(':visible')){
// do something
}
});
}
window.setInterval(foo, 100);
You can also perform some performance improvements on i...
Static member functions error; How to properly write the signature?
...
I'm guessing you've done something like:
class Foo
{
static void Bar();
};
...
static void Foo::Bar()
{
...
}
The "static void Foo::Bar" is incorrect. You don't need the second "static".
...