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How do you delete an ActiveRecord object?
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It's destroy and destroy_all methods, like
user.destroy
User.find(15).destroy
User.destroy(15)
User.where(age: 20).destroy_all
User.destroy_all(age: 20)
Alternatively you can use delete and delete_all which won't enforce :before_destro...
How to take column-slices of dataframe in pandas
...achine learning data from a CSV file. The first 2 columns are observations and the remaining columns are features.
10 Answe...
Removing transforms in SVG files
I have been struggling with this for a while, and can't seem to find an answer (that works) anywhere. I have an SVG file which looks like this:
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what is reverse() in Django
...e sure what this is but it is used together with HttpResponseRedirect. How and when is this reverse() supposed to be used?
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How can I update npm on Windows?
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Does not change the default global package location.
Allows easy upgrades and downgrades.
Officially recommended by the NPM team.
A list of versions matched between NPM and NODE (https://nodejs.org/en/download/releases/) - but you will need to download NODE INSTALLER and run that to update node (ht...
Convert XML to JSON (and back) using Javascript
How would you convert from XML to JSON and then back to XML?
12 Answers
12
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Restore LogCat window within Android Studio
I have recently started to use Android Studio v0.1.1, And i can't seem to find LogCat... Is it gone? Or if not, how can I enable it?
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NHibernate ISession Flush: Where and when to use it, and why?
...nfused is the use of session.Flush ,in conjunction with session.Commit , and session.Close .
4 Answers
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Pass arguments to Constructor in VBA
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Here's a little trick I'm using lately and brings good results. I would like to share with those who have to fight often with VBA.
1.- Implement a public initiation subroutine in each of your custom classes. I call it InitiateProperties throughout all my classes....
What does ~~ (“double tilde”) do in Javascript?
I was checking out an online game physics library today and came across the ~~ operator. I know a single ~ is a bitwise NOT, would that make ~~ a NOT of a NOT, which would give back the same value, wouldn't it?
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