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What is the purpose of the reader monad?
...tive instance means that if you have employees :: History Day [Person] and customers :: History Day [Person] you can do this:
-- | For any given day, the list of employees followed by the customers
employeesAndCustomers :: History Day [Person]
employeesAndCustomers = (++) <$> employees <*&...
Ways to circumvent the same-origin policy
...hen accessing sources across origins. The basic idea behind CORS is to use custom HTTP headers to allow both the browser and the server to know enough about each other to determine if the request or response should succeed or fail.
For a simple request, one that uses either GET or POST with no cust...
How do I filter ForeignKey choices in a Django ModelForm?
....
form = UberClientForm(company)
...
#or even extend the existing custom init
class PITAClient(ClientForm):
def __init__(company, *args, **args):
super (PITAClient,self ).__init__(company,*args,**kwargs)
self.fields['support_staff'].queryset = User.objects.exclude(user='...
What is SOA “in plain english”? [closed]
...which implied
Similar feature were implemented several times
Data (e.g. customer or employee data) need to be shared between
several applications
Applications were department-centric.
With SOA, the idea is to have reusable services be made available enterprise-wide, so that application can be b...
How to specify the default error page in web.xml?
...e usage of HTTP authentication, having a disabled directory listing, using custom servlets and code which can possibly throw unhandled exceptions or does not have all methods implemented, then you'd like to set it for HTTP errors 401, 403, 500 and 503 respectively.
<error-page>
<!-- Mi...
Android: how to draw a border to a LinearLayout
...awable as android:background…
For example, let's define res/drawable/my_custom_background.xml as:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:radius="2dp"
android:topRightRadius="0dp"
android:bo...
differentiate null=True, blank=True in django
...ther the field will be required in forms. This includes the admin and your custom forms. If blank=True then the field will not be required, whereas if it's False the field cannot be blank.
The combo of the two is so frequent because typically if you're going to allow a field to be blank in your for...
Adding iOS UITableView HeaderView (not section header)
...for this. Takes longer to load. Write it in code. For reusability create a custom class & instantiate...
– Charles Robertson
Nov 18 '16 at 0:01
1
...
showDialog deprecated. What's the alternative?
...So instead of calling a simple function, you have to implement yet another custom class? sigh
– Cerin
Jul 12 '12 at 16:44
...
Blocks and yields in Ruby
...
This is very handy, for instance, to iterate over a list or to provide a custom algorithm.
Take the following example:
I'm going to define a Person class initialized with a name, and provide a do_with_name method that when invoked, would just pass the name attribute, to the block received.
cl...