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Rails - Validate Presence Of Association?
I have a model A that has a "has_many" association to another model B. I have a business requirement that an insert into A requires at least 1 associated record to B. Is there a method I can call to make sure this is true, or do I need to write a custom validation?
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Accessing member of base class
See the inheritance example from the playground on the TypeScript site:
2 Answers
2
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LINQ Distinct operator, ignore case?
Given the following simple example:
4 Answers
4
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Set background color of WPF Textbox in C# code
How can I change the background and foreground colors of a WPF Textbox programmatically in C#?
6 Answers
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Is generator.next() visible in Python 3?
I have a generator that generates a series, for example:
3 Answers
3
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adb update a non-market apk?
Is there a way we can update (not reinstall) a non-market apk on an Android device?
I could only find an adb install (nothing like adb update)
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C++ where to initialize static const
I have a class
5 Answers
5
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How to get last items of a list in Python?
I need the last 9 numbers of a list and I'm sure there is a way to do it with slicing, but I can't seem to get it. I can get the first 9 like this:
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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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