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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
...eter is present, and if it's not provided, the require method throws an error. It returns an instance of ActionController::Parameters for the key passed into require.
The permit method returns a copy of the parameters object, returning only the permitted keys and values. When creating a new ActiveR...
Remove Fragment Page from ViewPager in Android
...m trying to dynamically add and remove Fragments from a ViewPager, adding works without any problems, but removing doesn't work as expected.
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ASP.NET MVC View Engine Comparison
I've been searching on SO & Google for a breakdown of the various View Engines available for ASP.NET MVC, but haven't found much more than simple high-level descriptions of what a view engine is.
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How to create the most compact mapping n → isprime(n) up to a limit N?
Naturally, for bool isprime(number) there would be a data structure I could query.
I define the best algorithm , to be the algorithm that produces a data structure with lowest memory consumption for the range (1, N], where N is a constant.
Just an example of what I am looking for: I could rep...
How can I open Java .class files in a human-readable way?
...va applet's class file is doing under the hood. Opening it up with Notepad or Textpad just shows a bunch of gobbledy-gook.
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Close file without quitting VIM application?
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Yours is better than mine for what the OP asked, although I tend to prefer :enew because I like having the buffer in the buffer list. :)
– Rytmis
Nov 1 '08 at 22:39
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Display / print all rows of a tibble (tbl_df)
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You could also use
print(tbl_df(df), n=40)
or with the help of the pipe operator
df %>% tbl_df %>% print(n=40)
To print all rows specify tbl_df %>% print(n = Inf)
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How do you create a remote Git branch?
...lly created when you push it to the remote server. So when you feel ready for it, you can just do:
git push <remote-name> <branch-name>
Where <remote-name> is typically origin, the name which git gives to the remote you cloned from. Your colleagues would then just pull that bra...
Calculate total seconds in PHP DateInterval
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I guess I didn't RTFM... This is what I was looking for; thanks a lot!
– efritz
Jul 5 '10 at 1:24
3
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Change “on” color of a Switch
...the AppCompat.v7 library. You can then use simple styling to change the color of your components.
values/themes.xml:
<style name="Theme.MyTheme" parent="Theme.AppCompat.Light">
<!-- colorPrimary is used for the default action bar background -->
<item name="colorPrimary">@...