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How do I migrate a model out of one django app and into a new one?
...hen run:
$ python manage.py schemamigration specific create_cat --auto
+ Added model 'specific.cat'
$ python manage.py schemamigration common drop_cat --auto
- Deleted model 'common.cat'
myproject/
|-- common
| |-- migrations
| | |-- 0001_initial.py
| | |-- 0002_create_cat.py
| | `...
Difference between Mock / Stub / Spy in Spock test framework
... connections, files or databases or maybe use dozens of other objects. The advantage of mocks is that you can isolate the class under test from the rest of the system.
A stub is also a dummy class providing some more specific, prepared or pre-recorded, replayed results to certain requests under tes...
Image comparison - fast algorithm
...keypoint extraction" and "keypoint matching" and you'll find quite a few academic papers on the subject. These days, SIFT keypoints are arguably the most popular, since they can match images under different scales, rotations, and lighting. Some SIFT implementations can be found here.
One downside...
How to handle Handler messages when activity/fragment is paused
...oid operating system does not appear to have a mechanism that sufficiently addresses your problem I believe this pattern does provide a relatively simple to implement workaround.
The following class is a wrapper around android.os.Handler that buffers up messages when an activity is paused and plays...
How to merge YAML arrays?
I would like to merge arrays in YAML, and load them via ruby -
5 Answers
5
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How to create a self-signed certificate for a domain name for development?
...ine certificates repository as follows (these commands must be run from an Administrator account or within an elevated command prompt):
makecert.exe -n "CN=My Company Development Root CA,O=My Company,
OU=Development,L=Wallkill,S=NY,C=US" -pe -ss Root -sr LocalMachine
-sky exchange -m 120 -a sha1 ...
In what cases could `git pull` be harmful?
...
Summary
By default, git pull creates merge commits which add noise and complexity to the code history. In addition, pull makes it easy to not think about how your changes might be affected by incoming changes.
The git pull command is safe so long as it only performs fast-forward ...
How to make my custom type to work with “range-based for loops”?
...
The requirements on the begin/end return value are simple: You must overload pre-++, ensure the initialization expressions are valid, binary != that can be used in a boolean context, unary * that returns something you can assign-initialize range_declaration with, and expose a public destructor.
Doi...
Why would one use the Publish/Subscribe pattern (in JS/jQuery)?
... event, the View catches it and updates itself. You don’t have any overhead from the publish/subscribe, it helps you for the decoupling. In the same manner you can keep your application logic in the Controller for example (MVVM, MVP it’s not exactly a Controller) and keep the View as simple as p...
What are some compelling use cases for dependent method types?
...icult to refactor.
I'll illustrate that with an exercise I give during my Advanced Scala training course,
trait ResourceManager {
type Resource <: BasicResource
trait BasicResource {
def hash : String
def duplicates(r : Resource) : Boolean
}
def create : Resource
// Test meth...