silverdr
There is a fine answer
on SO by @chrismccord about pleasant pattern-matching request format on controller actions, followed by a few comments saying that it does not work. Well - I checked - it doesn’t. A suggestion of digging into private fields of conn instead unfortunately seems far less elegant. I assume this particular answer’s author knew what he was talking about 
In such case the param must have been removed at some point. And yes, I can imagine valid reasons for this removal but would like to know a) what was the actual rationale, and b) if there’s any replacement for this, other than mentioned in the comments to the answer (conn/private/phoenix_format) that could be used to pattern-match on controller actions?
Where Next?
Trending in Questions
Other Trending Topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
At WyeWorks, we believe great software is built by combining technical excellence with genuine human connection
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
- #code-sync
- #discussion
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #ai
- #umbrella
- #elixirconf-us
- #full-time-contract
- #podcasts-by-brainlid
- #blog-post
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #elixirconf-eu
- #processes
- #security
- #api
- #forms
- #performance
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. Next: ElixirConf EU 2027
Master modern tools, write cleaner code, and tackle real-world challenges.
**Building the future of software with AI, trust, and human connection.**
The deployment platform built for Elixir: PaaS ease, VPS control.
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 5- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
mcrumm
You can use
Phoenix.Controller.get_format/1to get the format for the current request.Also note that the param key is
"_format"LostKobrakai
There‘s also the option to change the parameters on controller actions:
silverdr
Yes, and then I surely can
casethe output inside function body. But how do you propose I pattern-match controller action functions using this?silverdr
Right. In such case I could “massage” whatever’s passed down to actions as I see fit and problem solved. OTOH it feels a bit like wrestling with the framework rather than working with it
– you know what I mean? It’s probably the most flexible way though.
LostKobrakai
That’s for sure a valid concern, but this is a documented feature of the framework – just a rarely used one.