kandi X-RAY | o2o Summary
kandi X-RAY | o2o Summary
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QUESTION
Question is regarding Subquery
and ArrayAgg
in Django ORM.
For example I have 2 models without any relationship one to another:
...ANSWER
Answered 2020-Jul-22 at 03:22For MySQL backend, you can use GroupConcat of django-mysql, or take a look on the post to make a aggregate function youself:
QUESTION
I am trying to create a button that copies some text with a specific id and when that button is pressed, the text is copied, but with some blanks.
...ANSWER
Answered 2020-Mar-23 at 11:16$(element).text().replace(/\s/g, "")
QUESTION
I have a model queryset
for which I need to perform caching for O2M and M2M relationships, using prefetch_related
.
The same goes for O2O relationships, using select_related
accordingly.
I want to do this as a generic implementation, in which I will locate all related_name
values of the related models and unpack them like this:
ANSWER
Answered 2019-Feb-09 at 20:29Ok, I ended up using the Model _meta.get_fields()
method, thanks to Daniel Roseman for dismissing my second thoughts about it!
Here's the implementation:
QUESTION
ANSWER
Answered 2018-Nov-05 at 16:56Removing the :before
pseudo and using a background image at size 16px
QUESTION
This is a bit of a theoretical question. In a programming assignment, we have been told to implement the Game of Life by John Conway. As an additional task, we've been asked to modify the program so that it can detect repetitions of patterns for periods up to four generations. For example, the program should behave like this, given this specific "seed" to the game:
...ANSWER
Answered 2017-Jul-18 at 19:38Is it possible to really know when a program is simply repeating the same pattern over and over again?
Conway's Game of Life is 100% deterministic, which means that no matter when you encounter a pattern, you always know exactly what the next evolution of the pattern will be. On top of this, a given input in one generation will always result in one specific output for the next generation, regardless of when that input is received.
So to find periods in the evolution of the state, all you'd have to do is detect when/if a duplicate state appears; at that moment, you know you've found a cycle. I'm going to write my example code in C++, but any language which has a "Hash Table" or similar data structure can use the same basic algorithms.
QUESTION
After I run this command:
...ANSWER
Answered 2017-Apr-18 at 14:18Look at the message:
Could not decompress the archive enable the PHP zip extension
You have to enable the php-zip extension. To do this, use:
PHP5:
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