fix: include generic GET action arguments as query parameters in JSON schema

lib/ash_json_api/json_schema/json_schema.ex

@@ -675,7 +675,7 @@ defmodule AshJsonApi.JsonSchema do
       }
     }
 
-    if route.type in [:get, :related] do
+    if route.type in [:get, :related] or (route.type == :route and route.method == :get) do
       props
       |> add_route_properties(resource, properties)
       |> add_read_arguments(route, resource)

test/acceptance/generic_action_index_test.exs

@@ -123,7 +123,7 @@
            ]
   end
 
   test "generic action index route with missing required argument returns error" do
     response =
       Domain
       |> get("/search", status: 400)
@@ -141,4 +141,21 @@
     assert String.contains?(source_pointer, "query"),
            "Expected source pointer '#{source_pointer}' to contain field name 'query'"
   end
+
+  test "generic GET actions include arguments as query parameters in JSON schema" do
+    schema = AshJsonApi.JsonSchema.generate([Domain])
+
+    assert %{
+             "method" => "GET",
+             "rel" => "route",
+             "hrefSchema" => %{
+               "properties" => properties,
+               "required" => required
+             }
+           } = Enum.find(schema["links"], &(&1["method"] == "GET" and &1["rel"] == "route"))
+
+    assert Map.has_key?(properties, "query")
+    assert Map.has_key?(properties, "category")
+    assert "query" in required
+  end
 end