Where does Routes.static_path() fn come from?

hlship · August 22, 2021, 11:07pm

I can see that it’s a callback from Phoenix.Endpoint, but I’ve gotten a bit lost in macro expansion.

A view will alias Routes to .Router.Helpers, which AFAIK is generated on the fly by macro expansion in Phoenix.Router, and it looks like it involves Phoenix.Router.Helpers.

I really like to know how all the dots are connected, and this one is escaping me.

crispinb · August 23, 2021, 12:45am

I’m sure someone who actually knows something will illuminate, but in the meantime if you want to dig further yourself here are some notes I jotted down (before persuading myself that I really must gen up on elixir macros before going backwards through the framework even more …)

The meat seems to be in Phoenix.Router.Helpers define phoenix/helpers.ex at v1.5.11 · phoenixframework/phoenix · GitHub

This gets to the project via the __before_compile__ macro in Phoenix.Router which is used in the main web module.

It’s a bit circuitous & at my level of elixir knowledge I find it kind of hard to trace (or at least to grok what I find)

qhwa · August 23, 2021, 2:13am

@crispinb is right. Just to add to the answer, here’s the relationship among the modules:

In case you’re not familiar with @before_compile, you can check out the official documentation:
https://hexdocs.pm/elixir/Module.html#module-before_compile-1