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django admin - add custom form fields that are not part of the model
I have a model registered in the admin site. One of its fields is a long string expression. I'd like to add custom form fields to the add/update page of this model in the admin that based on these fields values I will build the long string expression and save it in the relevant model field.
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In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
In my experience, getting dates/times right when programming is always fraught with danger and difficulity.
3 Answers
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How to copy in bash all directory and files recursive?
I have script:
2 Answers
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Checking that a List is not empty in Hamcrest
I was wondering if anyone knew of a way to check if a List is empty using assertThat() and Matchers ?
5 Answers
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Open Facebook page from Android app?
from my Android app, I would like to open a link to a Facebook profile in the official Facebook app (if the app is installed, of course). For iPhone, there exists the fb:// URL scheme, but trying the same thing on my Android device throws an ActivityNotFoundException .
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What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?
What is the difference between Unidirectional and Bidirectional associations?
4 Answers
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How to know if user is logged in with passport.js?
I've been reading passport.js info and samples for two days, but I'm not sure after that I did all the process of authenticating.
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Negation in Python
I'm trying to create a directory if the path doesn't exist, but the ! (not) operator doesn't work. I'm not sure how to negate in Python... What's the correct way to do this?
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Get PostGIS version
How can I find out which version of PostGIS I have?
5 Answers
5
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SqlAlchemy - Filtering by Relationship Attribute
I don't have much experience with SQLAlchemy and I have a problem, which I can't solve. I tried searching and I tried a lot of code.
This is my Class (reduced to the most significant code):
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