In a unit test, i launched a query which needs 3 parameters as follows:

@query """
    query ($container_type: String!, $container_id: UUID!, $limit: Int) {
      messages_for_container(container_type: $container_type, container_id: $container_id, limit: $limit) {
        messages {
          id
        }
      }
    }
"""
test "returns a limited number of messages", %{conn: conn, user: user} do
      ...
      conn =
        get(conn, "/graphql2",
          query: @query,
          variables: %{
            container_type: room.container_type,
            container_id: room.container_id,
            limit: 1
          }
        )

      assert %{"data" => data} = json_response(conn, 200)
      ...
    end

It failed with the following error:

%{"errors" => [%{"locations" => [...], "message" => "Argument \"limit\" has invalid value $limit."}] }

That mean limit parameter didn’t get the right value from what was passed.

What confused me most is that if i directly set limit to 1 and remove $limit totally, it passed:

@query """
    query ($container_type: String!, $container_id: UUID!) {
      messages_for_container(container_type: $container_type, container_id: $container_id, limit: 1) {
        messages {
          id
        }
      }
    }
"""
test "returns a limited number of messages", %{conn: conn, user: user} do
      ...
      conn =
        get(conn, "/graphql2",
          query: @query,
          variables: %{
            container_type: room.container_type,
            container_id: room.container_id,
          }
        )

      assert %{"data" => data} = json_response(conn, 200)
      ...
    end

So there is no problem with the schema. Anybody has some hints:

phoenix version: 1.7.7
absinthe version: 1.7.5