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An item with the same key has already been added
...ch contains the same property twice. Perhaps you are using new to hide the base property.
Solution is to override the property or use another name.
If you share your model, we would be able to elaborate more.
share
...
How to link Docker services across hosts?
...ghtweight and various solutions exist, but generally with some caveats
DNS-based discovery e.g. with skydock and SkyDNS
Docker management tools such as Shipyard, and Docker orchestration tools. See this question for an extensive list: How to scale Docker containers in production
...
Shorter syntax for casting from a List to a List?
... }
}
public class Elephant : Animal
{
public Elephant(string name) : base(name){}
}
public class Zebra : Animal
{
public Zebra(string name) : base(name) { }
}
When working with a collection of mixed types:
var mixedAnimals = new Animal[]
{
new Zebra("Zed"),
new Elephant("Ellie...
How to prevent browser page caching in Rails
...ler.rb
After Rails 5:
class ApplicationController < ActionController::Base
before_action :set_cache_headers
private
def set_cache_headers
response.headers["Cache-Control"] = "no-cache, no-store"
response.headers["Pragma"] = "no-cache"
response.headers["Expires"] = "Mon, 01 ...
How would one write object-oriented code in C? [closed]
...n (void) {
int status;
tCommClass commTcp, commHttp;
// Same 'base' class but initialised to different sub-classes.
tcpInit (&commTcp);
httpInit (&commHttp);
// Called in exactly the same manner.
status = (commTcp.open)(&commTcp, "bigiron.box.com:5000");
...
Save image from URL by paperclip
...
Here is a simple way:
require "open-uri"
class User < ActiveRecord::Base
has_attached_file :picture
def picture_from_url(url)
self.picture = open(url)
end
end
Then simply :
user.picture_from_url "http://www.google.com/images/logos/ps_logo2.png"
...
Django URL Redirect
...
You can try the Class Based View called RedirectView
from django.views.generic.base import RedirectView
urlpatterns = patterns('',
url(r'^$', 'macmonster.views.home'),
#url(r'^macmon_home$', 'macmonster.views.home'),
url(r'^macmon_ou...
Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
...g>
Note thus that you should not use both ways. Use either annotation based configuarion or XML based configuration. When you have both, then XML based configuration will override annotation based configuration.
Verifying the build/deployment
In case you're using a build tool such as Eclipse ...
How to achieve function overloading in C?
...at it can be inserted by the C preprocessor and choose a result expression based on the type of the arguments passed to the controlling macro. So (example from the C standard):
#define cbrt(X) _Generic((X), \
long double: cbrtl, \
def...
Is there an equivalent to e.PageX position for 'touchstart' event as there is for click event?
...
I use this simple function for JQuery based project
var pointerEventToXY = function(e){
var out = {x:0, y:0};
if(e.type == 'touchstart' || e.type == 'touchmove' || e.type == 'touchend' || e.type == 'touchcancel'){
var touch = e.or...