fchabouis
I would like to know if there is a way, in a mix project, to get information about where a function is defined?
I would like, given a module name and function name, to know that this function is defined line 8 of foo.ex file. I guess it is possible to find information like this, as we get lines number when running tests or for compiler warnings.
Thanks!
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Deploy Phoenix to your own VPS with PaaS ease: push-to-deploy, zero downtime, auto SSL, managed Postgres. 14-day free trial at potions.io
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixirconf-us
- #blog-post
- #ai
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #hex
- #security
- #metaprogramming
Our Sponsors
Build Elixir applications with speed and confidence.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Practical resources that improve the lives of professional developers.
Bringing learning, work and compliance together since 1987.
Producing high quality Elixir screencasts since 2017.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 10- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
hauleth
What exactly you are trying to achieve? You may look into ElixirLS sources how they do it.
fchabouis
I would like to create a mix task, taking one of my website url, and that would output the file and the line of the controller function that is called by that url. I am tired of going to the router file, see which module and function is called by the route, go that module and look for the corresponding function.
hauleth
You can try to extract that information from the
Code.fetch_docs/1. It will not always be 100% precise (as if there is documentation, then it will point to the line for documentation), but works well enough, especially in presence of multiple heads.LostKobrakai
Phoenix.Router — Phoenix v1.6.6 can give you the plug / plug_opts (action). But
MyController.action/2can be overwritten, so you cannot be sure thatMyController, :indexactually callsMyController.index/2.fchabouis
In my case, I don’t think there is any overwriting, so that would be good enough!
I found how to get the module and function name with
Phoenix.Router.route_info.Code.fetch_docs/1seems to be giving the line number in the file (thanks @hauleth ), I am just missing the name of the filehauleth
It is in the metadata of module itself. Just check out
module.module_info().fchabouis
Thanks, I have all the information I need
Phoenix.Router.route_infoto know which module + function is calledmodule.module_info()for the source file pathCode.fetch_docs/1for the line numberambareesha7
It deserve a blog post, once you have clear solution, if you have time
fchabouis
@ambareesha7 No blog post, but I made a PR on Phoenix that just got merged!
https://github.com/phoenixframework/phoenix/pull/4748
LostKobrakai
This is intersting. I’m wondering it this could also show all the places the route is referenced (with verified routes).