thojanssens1

thojanssens1

Boolean parameters in routes

In the docs for Phoenix Routing we can see several examples such as below, where a parameter is a boolean.

Routes.user_path(Endpoint, :show, 17, admin: true, active: false)
"/users/17?admin=true&active=false"

Do we ever want to pass a boolean though? Because that will result in a string “true” and “false” in the URL, and in the controller action, we’ll have to convert “true” and “false” string respectively to true and false.

I was thinking to pass 1 or 0 like I used to do in PHP, to easily convert the parameter into a boolean, but converting 0 to a boolean gives true.

iex> !!0
true

Actually, while I’m writing this, I have the idea to use String.to_existing_atom/1

String.to_existing_atom("false")
String.to_existing_atom("true")

Do you do the same? Would maybe be interesting to have a plug that detects true and false strings for any route param (and query string param) and convert them automatically to the atoms? Systematically for all incoming requests.

Marked As Solved

dimitarvp

dimitarvp

I never use the strings “true” and “false” in these situations. But even if I did, you still have to convert anything coming to your controllers from string to the proper type – and also validate! – before acting on it. Doesn’t matter much if it’s the true/false or 1/0.

This is for you to decide but I wouldn’t. Make a Plug, sure, but use it selectively inside your controllers like so:

plug BooleanParameter, only: [:admin, :use_utc_time]

The above is used with crushing success and is practically one of the reasons for Phoenix being as good as it is (although there are many reasons).

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