thojanssens1
Absinthe Dataloader fetches assocs even if already preloaded
Say the Absinthe resolver returns a struct with an assoc that has already been loaded, e.g.
%Organization{
name: "Acme",
members: []
}
When using Dataloader with Absinthe to load the :members for the organization, dataloader will still execute a query to fetch the members while it was already loaded (set to []).
I found this old merge:
- Dataloader Ecto: Prevent reuse of a preloaded child · Issue #18 · absinthe-graphql/dataloader · GitHub
- Prevent Ecto Caching by benwilson512 · Pull Request #19 · absinthe-graphql/dataloader · GitHub
But the above GH comments don’t really state why we ignore already preloaded associations. It only mentions consistency but I do not see why we need to execute preload queries again if those had already been executed against the db, leading to double db requests.
Any idea as to why?
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arcyfelix
An example how you can sort it out:
field :members, non_null(list_of(non_null(:member_type))) do
resolve(fn parent, args, context ->
case parent.members do
%Ecto.Association.NotLoaded{} ->
dataloader(:source, :members).(parent, args, context)
members->
{:ok, members}
end
end)
end
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