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Converting an array of objects to ActiveRecord::Relation
I have an array of objects, let's call it an Indicator . I want to run Indicator class methods (those of the def self.subjects variety, scopes, etc) on this array. The only way I know to run class methods on a group of objects is to have them be an ActiveRecord::Relation. So I end up resorting to...
$on and $broadcast in angular
I have a footerController and codeScannerController with different views.
4 Answers
4
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Abort makefile if variable not set
... More precisely, no tabs must precede these lines.
Generic solution
In case you're going to test many variables, it's worth defining an auxiliary function for that:
# Check that given variables are set and all have non-empty values,
# die with an error otherwise.
#
# Params:
# 1. Variable nam...
Multiple aggregations of the same column using pandas GroupBy.agg()
...g functions f1, f2 to the same column df["returns"] , without having to call agg() multiple times?
3 Answers
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What are 'get' and 'set' in Swift?
...re the code:
In addition to simple properties that are stored, properties can have a getter and a setter.
class EquilateralTriangle: NamedShape {
...
When some other class wants to get that perimeter variable, they do this:
let someVar = myTriangle.perimeter
... Which calls this:
get{
r...
Does setting Java objects to null do anything anymore?
I was browsing some old books and found a copy of "Practical Java" by Peter Hagger. In the performance section, there is a recommendation to set object references to null when no longer needed.
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Can you help me understand Moq Callback?
Using Moq and looked at Callback but I have not been able to find a simple example to understand how to use it.
5 Answers...
Why do I need Transaction in Hibernate for read-only operations?
...ndeed strange and often people don't mark methods for transactions in this case. But JDBC will create transaction anyway, it's just it will be working in autocommit=true if different option wasn't set explicitly.
But there is no guarantee that your method doesn't write into the database. If you mark...
combinations between two lists?
...having trouble wrapping my head around a algorithm I’m try to make. Basically, I have two lists and want to get all the combinations of the two lists.
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Memory management in Qt?
...I need to delete and/or destroy my objects? Is any of this handled automatically?
4 Answers
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