thojanssens1
Hello,
When I try to use:
IO.inspect Phoenix.Endpoint.url()
it says:
function Phoenix.Endpoint.url/0 is undefined or private
I tried to call another function from Phoenix like IO.inspect Phoenix.json_library() and it works (returns “Jason”).
Why does it say that the function url/0 is undefined or private?
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aesmail
Phoenix.Endpoint.url/0is a callback.Try
YourAppWeb.Endpoint.urlinstead.thojanssens1
Thank you. How do these callbacks work actually?
sb8244
When you
use Phoenix.Endpoint, the__using__macro is invoked (phoenix/lib/phoenix/endpoint.ex at v1.4.10 · phoenixframework/phoenix · GitHub). This function unquotes several other blocks of code (phoenix/lib/phoenix/endpoint.ex at v1.4.10 · phoenixframework/phoenix · GitHub).Here you can see where
url/0is implemented (phoenix/lib/phoenix/endpoint.ex at v1.4.10 · phoenixframework/phoenix · GitHub).The callback dictates which functions must be defined when you implement a Behavior.
url/0is one of these functions. Phoenix, of course, provides default implementations for all of these core Behaviors.