moxley
Using Ash.Query.add_error()
I’m creating a read AshGraphql query, and I want it to return an error for certain conditions. When I call Ash.Query.add_error(query, "some error message") or similar in the action prepare, the GraphQL query returns:
%{
"data" => %{"listMemberSelfSubscriptions" => nil},
"errors" => [
%{
"locations" => [%{"column" => 3, "line" => 2}],
"message" => "Something went wrong. Unique error id: `dd416b26-3ffd-4731-aae3-279a2131cb05`",
"path" => ["listMemberSelfSubscriptions"]
}
]
}
It always returns a generic “Something went wrong”. How do I pass an error message to the response?
If I use raw Ash.Query without AshGraphql, calling Ash.Query.add_error() results in an UnknownError:
%Ash.Error.Unknown{
errors: [
%Ash.Error.Unknown.UnknownError{
error: ": Test error",
field: nil,
value: nil,
splode: Ash.Error,
bread_crumbs: [],
vars: [],
path: [],
stacktrace: #Splode.Stacktrace<>,
class: :unknown
}
]
}
For that matter, how do I use Ash.Query.add_error()? There’s no documentation for it:
Marked As Solved
zachdaniel
Ahh, that doc is out of date for 3.0, sorry! Using exception modules like that is “the way”, the only difference is that all our errors are exceptions, so you’d use .exception as if it was any other error. It’s all powered by the library (which was extracted out of Ash) called Splode API Reference — splode v0.3.1
Then, these errors have a specific protocol defined for them to allow them to be exposed over an API (differs depending on the API). You can also define your own errors and use those, if you implement the appropriate protocol.
You can see examples here: ash_graphql/lib/error.ex at main · ash-project/ash_graphql · GitHub
Also Liked
zachdaniel
Since a release was just done yesterday, I was able to publish these new docs, so the hexdocs for Ash should reflect these updates as of now.
moxley
That’s great to hear! I’ll keep an eye our for opportunities to pitch in with some documentation PRs.
allenwyma
Last Post!
allenwyma
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