make query helpers default with flop format

lib/policy_service_web/query_helpers.ex

@@ -3,31 +3,26 @@ defmodule PolicyServiceWeb.QueryHelpers do
 
   alias OpenApiSpex.Schema
 
+  @filter_count 3
+
   def flop(filter_fields, order_fields, other \\ []) do
+    filter_params = build_filter_params(filter_fields, @filter_count)
+
     [
-      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
+      page_size: [in: :query, schema: %Schema{type: :number, default: 20}],
+      "order_by[]": [in: :query, schema: %Schema{type: :array, items: %Schema{type: :string, enum: order_fields}}],
+      "order_directions[]": [in: :query, schema: %Schema{type: :array, items: %Schema{type: :string, enum: ["asc", "desc"]}}]
+    ] ++ filter_params ++ 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}}
+  defp build_filter_params(fields, count) do
+    for i <- 0..(count - 1) do
+      [
+        {"filters[#{i}][field]", [in: :query, schema: %Schema{type: :string, enum: fields}]},
+        {"filters[#{i}][op]", [in: :query, schema: %Schema{type: :string, enum: Flop.Filter.allowed_operators(:all)}]},
+        {"filters[#{i}][value]", [in: :query, schema: %Schema{type: :string}]}
+      ]
+    end |> List.flatten()
   end
 end