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Difference between attr_accessor and attr_accessible
...ment: new(attrs) or update_attributes(attrs).
Here's a mass assignment:
Order.new({ :type => 'Corn', :quantity => 6 })
You can imagine that the order might also have a discount code, say :price_off. If you don't tag :price_off as attr_accessible you stop malicious code from being able to ...
Ruby on Rails Server options [closed]
...alled an app server cluster (hence the name Mongrel Cluster, Thin Cluster, etc). You must then setup Apache or Nginx to reverse proxy to this cluster. Apache/Nginx will take care of distributing requests between the instances in the cluster (More on this in section "I/O concurrency models").
The web...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
... ones in it and no evenly spaced 1s, so checking all pairs would be of the order of the square of the number of 1s in it: that's 4k ≈ n1.26 which unfortunately is asymptotically much larger than (n log n). In fact, the worst case is even worse: Leo Moser in 1953 constructed (effectively) such stri...
How do I get indices of N maximum values in a NumPy array?
...copy of an array from unconstrained min to unconstrained max in a reversed order)
– FizBack
Oct 19 '16 at 13:51
...
Operation on every pair of element in a list
...,1 3,2 3,3 3,4
4,1 4,2 4,3 4,4
permutations() generates all unique orderings of each unique pair of elements, eliminating the x,x duplicates:
. 1,2 1,3 1,4
2,1 . 2,3 2,4
3,1 3,2 . 3,4
4,1 4,2 4,3 .
Finally, combinations() only generates each unique pair of elements, in ...
C# Set collection?
...at contains no duplicate elements, and whose elements are in no particular order...
The capacity of a HashSet(Of T) object is the number of elements that the object can hold. A HashSet(Of T) object's capacity automatically increases as elements are added to the object.
The HashSet(Of...
fancybox2 / fancybox causes page to to jump to the top
....
The problem is that fancy box changes the overflow value of the body in order to hide the browser scrollbars.
As Dave Kiss points out, we can stop fancy box from doing this by adding the following parameters:
$('.image').fancybox({
padding: 0,
helpers: {
overlay: {
locked: false
...
NumPy array initialization (fill with identical values)
...Rolf Bartstra.)
a=np.empty(n); a.fill(5) is fastest.
In descending speed order:
%timeit a=np.empty(1e4); a.fill(5)
100000 loops, best of 3: 5.85 us per loop
%timeit a=np.empty(1e4); a[:]=5
100000 loops, best of 3: 7.15 us per loop
%timeit a=np.ones(1e4)*5
10000 loops, best of 3: 22.9 us per lo...
How can I find which tables reference a given table in Oracle SQL Developer?
...in ('P', 'U')
and table_name = :r_table_name
and owner = :r_owner
)
order by table_name, constraint_name
Where r_owner is the schema, and r_table_name is the table for which you are looking for references. The names are case sensitive
Be careful because on the reports tab of Oracle SQL D...
What is the difference between a schema and a table and a database?
...tabase Management System) is the software (like MySQL, SQL Server, Oracle, etc) that manages and runs a database.
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