use new query helper

lib/policy_service_web/query_helpers.ex

@@ -0,0 +1,33 @@
+defmodule PolicyServiceWeb.QueryHelpers do
+  @moduledoc false
+
+  alias OpenApiSpex.Schema
+
+  def flop(filter_fields, order_fields, other \\ []) do
+    [
+      filters: [in: :query, schema: filters(filter_fields)],
+      order_by: [in: :query, schema: order_by(order_fields)],
+      page: [in: :query, schema: %Schema{type: :number, default: 1}],
+      page_size: [in: :query, schema: %Schema{type: :number, default: 20}]
+    ] ++ other
+  end
+
+  defp filters(fields) do
+    %Schema{
+      type: :array,
+      items: %Schema{
+        type: :object,
+        properties: %{
+          field: %Schema{type: :string, enum: fields},
+          value: %Schema{type: :any},
+          op: %Schema{type: :string, enum: Flop.Filter.allowed_operators(:all)}
+        },
+        required: [:field, :value]
+      }
+    }
+  end
+
+  defp order_by(fields) do
+    %Schema{type: :array, items: %Schema{type: :string, enum: fields}}
+  end
+end