custom fields

app/controllers/account_custom_fields_controller.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class AccountCustomFieldsController < ApplicationController
+  before_action :load_account_config, only: :create
+
+  def create
+    authorize!(:create, Template)
+
+    @account_config.update!(account_config_params)
+
+    render json: @account_config.value
+  end
+
+  private
+
+  def load_account_config
+    @account_config =
+      AccountConfig.find_or_initialize_by(account: current_account, key: AccountConfig::TEMPLATE_CUSTOM_FIELDS_KEY)
+  end
+
+  def account_config_params
+    params.permit(
+      value: [[:uuid, :name, :type,
+               :required, :readonly, :default_value,
+               :title, :description,
+               { preferences: {},
+                 default_value: [],
+                 options: [%i[value uuid]],
+                 validation: %i[message pattern min max step],
+                 areas: [%i[x y w h cell_w option_uuid]] }]]
+    )
+  end
+end