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When to use a “has_many :through” relation in Rails?
...ps, then you could do something like this:
class Group < ActiveRecord::Base
has_many :users
end
class User < ActiveRecord::Base
belongs_to :group
end
What if you wanted to track additional metadata around the association? For example, when the user joined the group, or perhaps what th...
How to remove all namespaces from XML with C#?
...is not complete itself) and complete recursion function to work properly.
Based on interface:
string RemoveAllNamespaces(string xmlDocument);
I represent here final clean and universal C# solution for removing XML namespaces:
//Implemented based on interface, not part of algorithm
public static...
Django - what is the difference between render(), render_to_response() and direct_to_template()?
... context_processors.
But direct_to_template should be avoided as function based generic views are deprecated. Either use render or an actual class, see https://docs.djangoproject.com/en/1.3/topics/generic-views-migration/
I'm happy I haven't typed RequestContext in a long, long time.
...
How is it possible to declare nothing inside main() in C++ and yet have a working application after
...to be initialized before or during the first initialization of an std::ios_base::Init object. And <iostream> is guaranteed to behave "as if" it contained an instance of an std::ios_base_Init object at namespace scope.
– James Kanze
Jul 8 '13 at 15:30
...
How do I explicitly specify a Model's table-name mapping in Rails?
...>= 3.2 (including Rails 4+ and 5+):
class Countries < ActiveRecord::Base
self.table_name = "cc"
end
Rails <= 3.1:
class Countries < ActiveRecord::Base
self.set_table_name "cc"
...
end
share
|
...
Difference: std::runtime_error vs std::exception()
...
std::exception is the class whose only purpose is to serve as the base class in the exception hierarchy. It has no other uses. In other words, conceptually it is an abstract class (even though it is not defined as abstract class in C++ meaning of the term).
std::runtime_error is a more spe...
Center/Set Zoom of Map to cover all visible Markers?
...t's usage:
There are many approaches for doing what you asked for:
Grid based clustering
Distance based clustering
Viewport Marker Management
Fusion Tables
Marker Clusterer
MarkerManager
You can read about them on the provided link above.
Marker Clusterer uses Grid Based Clustering to cluster ...
Purpose of Django setting ‘SECRET_KEY’
... 'django.contrib.messages' + settings.SECRET_KEY
contrib/sessions/backends/base.py:89: pickled_md5 = md5_constructor(pickled + settings.SECRET_KEY).hexdigest()
contrib/sessions/backends/base.py:95: if md5_constructor(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:
contrib/s...
How to define a reply-to address?
...
Two ways:
class Notifications < ActionMailer::Base
default :from => 'your_app@your_domain.com',
:reply_to => 'some_other_address@your_domain.com'
end
Or:
class Contacts < ActionMailer::Base
def new_contact
mail( :to => 'somebody...
Using awk to print all columns from the nth to the last
...
Based on this: stackoverflow.com/a/39217130/8852408, is probable that this solution isn't very efficient.
– FcknGioconda
Jul 19 '18 at 3:32
...