xgeek116
Phoenix do not take into consideration my custom errorView
I have defined a custom exception :
defmodule UnkownBookError do
@moduledoc false
defexception message: "Unknown book id", plug_status: 404
end
In ErrorView module I have added my custom error view func :
def render("error.json", %{message: message}) do
%{errors: %{detail: message}}
end
But I always get this in the console :
[debug] Converted error Booking.BookHandler.UnkownBookError to 404 response
and I get a text response in Postamn instead of JSON :
What I’m missing here ?
Thanks
Marked As Solved
fuelen
- What headers do you have? Have you sent
Accept: application/json? - Matching by template name is invalid. In case of 404, the template is the following:
404.json, noterror.json. - The second parameter is not an exception, but
assigns. The exception could be found inassigns.reason.
If you want generic handler for JSON format:
def render(<<_::binary-size(3)>> <> ".json" = template, assigns) do
%{
error: Phoenix.Controller.status_message_from_template(template),
description: Exception.message(assigns.reason)
}
end
but don’t show a message from all exceptions, as they may contain not public information
Also Liked
xgeek116
Thanks a lot @fuelen , so I get that “error_view.ex” is responsible from rendring theese errors, so what is the purpose of “fallback_controller.ex” ?
For example in my file “fallback_controller.ex” I have only :
I’m not defining how Forbidden (403 status) will be handled, and If I try a forbidden action I get the correct error :
LostKobrakai
action_fallback is about consolidating common error return values (of your business logic) and how they’re transformed to http responses (it’s about data).
MyAppWeb.ErrorView is a view, so it’s about transforming elixir data into json/html/whatever format your http response should be formatted in. This one specifically is about rendering responses for the various http error codes.
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