大约有 23,000 项符合查询结果（耗时：0.0418秒） [XML]
Creating Multifield Indexes in Mongoose / MongoDB
...
@KetanGhumatkar It's based on the order the fields are listed in the object in the call to index.
– JohnnyHK
Oct 26 '16 at 13:01
...
Best way to do multiple constructors in PHP
... What i meant is that you're doing different things in the same scope based on outside influence, It's not a bad solution (since it will work), just not the one I would choose.
– Kris
Nov 9 '09 at 16:27
...
Copying a HashMap in Java
...
I don't have access to the HashMap in the base class. Again, I have to work with classes derived from the base. I cannot access the HashMap in it.
– user691305
Apr 10 '12 at 13:24
...
How do I update an NPM module that I published?
...ted in the "You cannot publish over..." error.
The steps to resolve were (based on ops version number):
npm version 0.0.2
npm publish
share
|
improve this answer
|
follow...
Pointer vs. Reference
...
What about polymorphism (e.g. Base* b = new Derived())? This seems like a case that can't be handled without pointers.
– Chris Redford
Mar 7 '13 at 19:25
...
What is difference between MVC, MVP & MVVM design pattern in terms of coding c#
...’s because a single controller may select different views to be rendered based on the operation being executed.
There is one way arrow from Controller to View. This is because the View doesn’t have any knowledge of or reference to the controller.
The Controller does pass back the Model, so the...
Does R have an assert statement as in python?
...E){
warning("error message to print")
}
These are both provided by base R and require no packages to run or include in writing your own functions. I prefer this approach to write code with fewer dependancies and this syntax is widely used in package development. However, similar functionalit...
Test whether a Ruby class is a subclass of another class
...
@JunanChakma Based on how the English word "ancestors" is defined, I agree that the return value should not include B. But it does. The method documentation says, "Returns a list of modules included/prepended in mod (including mod itself)...
What does the 'Z' mean in Unix timestamp '120314170138Z'?
...Zulu time.
Technically, because the definition of nautical time zones is based on longitudinal position, the Z time is not exactly identical to the actual GMT time 'zone'. However, since it is primarily used as a reference time, it doesn't matter what area of Earth it applies to as long as everyon...
Rails: How do I create a default value for attributes in Rails activerecord's model? [duplicate]
....
OR
You can use a callback, before_save
class Task < ActiveRecord::Base
before_save :default_values
def default_values
self.status ||= 'P' # note self.status = 'P' if self.status.nil? might be safer (per @frontendbeauty)
end
end
...