John_Shelby
Hello,
I have a problem after logging in to my app and I don’t know how to solve this error: key :conn not found in: %{__changed__: % in my_app_web/templates/layout/app.html.heex Has anyone encountered this before? I’m upgrading from phoenix from 1.6.9 to 1.7.0 and phoenix_live_view from 17.8 to 18.3.
I don’t know what I should have set wrong. I followed the upgrade instructions or also the video from Elixircast
I checked web.ex and everything from tutorials, but it seems ok.
Has anyone had the same problem please?
Any ideas? Thank you.
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LostKobrakai
I think you want to use a root layout with LV to put everything outside of the html body. Usually that’s in
root.html.heex.Most Liked
LostKobrakai
If you’re using LV you should have a
root.html.heexand use that as root template. Leave just the pieces within<body>inapp.html.heex, there rest goes intoroot.html.heex. Everything in the root template is not touched by LV, but everything withinapp.htmlcan be. LV trying to manage head content however won’t go well.root.html.heexwill always receive a@conn, but (if you stick to using it for LV and non-LV)app.html.heexwill either have access to a@connor@socketdepending on the type of page. For all things related to links you can substitute them forMyAppWeb.Endpoint, which works for both types of pages.smathy
Right, yes, that’s a difficult situation. What I think the problem here is is that you have
@conninside yourheextemplate tags ({}), which is then being processed by LV as a tracked template var, and hence it’s looking for the:connkey in its internal__changed__map (which it can’t find). If you look in a new 1.7 project’sroot.html.heexyou’ll see it’s now using the verified routes~psigil:…so that should solve this problem, but I fear that’ll just lead you to the next, and the next, and the next.
smathy
Not answering your specific question here, but generally I find the best approach is to use the generator to create two new empty projects, one in the old version and one in the new version and use a
diffof those two as a guide for what to change in your project.Last Post!
Techie
Hi, I’m facing the same error condition:
[error] ** (KeyError) key :conn not found in: %{Tried downgrading to version 1.6.9, but still the same error persists !.
Any workarounds available?