Ash Elixir•3y ago

Using AshGraphql to fetch a single item without providing arguments

My app uses attribute-based multitenancy. There is a resource called WebSite, and the tenant would normally have only one of these. I am trying to create a GraphQL query called getWebSite that returns the tenant's WebSite, but the query response has the error, "In argument "id": Expected type "ID!", found null." I don't want the query to take any arguments. Here is the test that reproduces there error:

# This returns an error
query = """
query GetWebSite {
  getWebSite {
    id
  }
}
"""

resp_body =
  conn
  |> set_authorized_user(user)
  |> set_org(org) # tenant
  |> put_req_header("content-type", "application/json")
  |> post("/api/gql", query: query)
  |> json_response(200)

# resp_body:
# %{"errors" => [%{"locations" => [%{"column" => 3, "line" => 2}], "message" => "In argument \"id\": Expected type \"ID!\", found null."}]}

# This returns an error
query = """
query GetWebSite {
  getWebSite {
    id
  }
}
"""

resp_body =
  conn
  |> set_authorized_user(user)
  |> set_org(org) # tenant
  |> put_req_header("content-type", "application/json")
  |> post("/api/gql", query: query)
  |> json_response(200)

# resp_body:
# %{"errors" => [%{"locations" => [%{"column" => 3, "line" => 2}], "message" => "In argument \"id\": Expected type \"ID!\", found null."}]}

Here are the relevant parts of the WebSite resource:

actions do
  read :get_web_site do
    prepare build(limit: 1)
  end
end

graphql do
  type :web_site

  queries do
    get :get_web_site, :get_web_site
  end
end

actions do
  read :get_web_site do
    prepare build(limit: 1)
  end
end

graphql do
  type :web_site

  queries do
    get :get_web_site, :get_web_site
  end
end

How do I solve this?

5 Replies

ZachDaniel•3y ago

I believe the pattern for this is get :get_web_site, :get_web_site, identity: false to instruct it to not use any of the identities on the resource to look it up

moxleyOP•3y ago

Thank you. I will try this... It worked!

ZachDaniel•3y ago

🥳

moxleyOP•3y ago

Is there documentation on this? I couldn't find any documentation on the AshGraph queries and mutations DSL. Never mind. I found it under the Ash.Resource documentation.

ZachDaniel•3y ago

👍

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Using AshGraphql to fetch a single item without providing arguments

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