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Rails migration for has_and_belongs_to_many join table
...ll => false
t.references :orange, :null => false
end
# Adding the index can massively speed up join tables. Don't use the
# unique if you allow duplicates.
add_index(:apples_oranges, [:apple_id, :orange_id], :unique => true)
If you use the :unique => true on the index, then you shou...
Pretty Printing a pandas dataframe
...-----+
Note:
To suppress row indices for all types of data, pass showindex="never" or showindex=False.
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how to return index of a sorted list? [duplicate]
I need to sort a list and then return a list with the index of the sorted items in the list. For example, if the list I want to sort is [2,3,1,4,5] , I need [2,0,1,3,4] to be returned.
...
SQL Server: Make all UPPER case to Proper Case/Title Case
... VARCHAR(255)) RETURNS VARCHAR(255)
AS
BEGIN
DECLARE @i INT -- index
DECLARE @l INT -- input length
DECLARE @c NCHAR(1) -- current char
DECLARE @f INT -- first letter flag (1/0)
DECLARE @o VARCHAR(255) -- output string
DECLARE @w VARCHAR(10) -- chara...
Build a Basic Python Iterator
... def __init__(self, text):
self.text = text.upper()
self.index = 0
def __iter__(self):
return self
def __next__(self):
try:
result = self.text[self.index]
except IndexError:
raise StopIteration
self.index += 1
...
Can I set an opacity only to the background image of a div?
...t;
Hi there
</div>
CSS
.myDiv {
position: relative;
z-index: 1;
}
.myDiv .bg {
position: absolute;
z-index: -1;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(test.jpg) center center;
opacity: .4;
width: 100%;
height: 100%;
}
See...
python dataframe pandas drop column using int
...('column name', axis=1). Is there a way to drop a column using a numerical index instead of the column name?
9 Answers
...
ViewBag, ViewData and TempData
...e View.
public class OneController: Controller
{
public ActionResult Index()
{
TempData["foo"] = "bar";
return RedirectToAction("index", "two");
}
}
public class TwoController: Controller
{
public ActionResult Index()
{
var model = new MyViewModel
...
通过FastCGI Cache实现服务降级 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...rver 1000;
server_name *.xip.io;
root /usr/local/www;
index index.html index.htm index.php;
location / {
try_files $uri $uri/ /index.php$is_args$args;
}
location ~ \.php$ {
set $cache_key $request_method://$host$request_uri;
set $c...
Javascript - sort array based on another array
...he sorting array:
result = items.map(function(item) {
var n = sorting.indexOf(item[1]);
sorting[n] = '';
return [n, item]
}).sort().map(function(j) { return j[1] })
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