Stringify properties before filtering (#1929)

lib/liquid/standardfilters.rb

@@ -979,8 +979,10 @@ module Liquid
     attr_reader :context
 
     def filter_array(input, property, target_value, default_value = [], &block)
-      ary = InputIterator.new(input, context)
+      property = Liquid::Utils.to_s(property)
+      return default_value if property.empty?
 
+      ary = InputIterator.new(input, context)
       return default_value if ary.empty?
 
       block.call(ary) do |item|

test/integration/standard_filter_test.rb

@@ -1061,6 +1061,19 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result(expected_output, template, { "array" => array })
   end
 
+  def test_where_with_non_string_property
+    array = [
+      { "handle" => "alpha", "{}" => true },
+      { "handle" => "beta", "{}" => false },
+      { "handle" => "gamma", "{}" => false },
+      { "handle" => "delta", "{}" => true },
+    ]
+    template = "{{ array | where: some_property, true | map: 'handle' | join: ' ' }}"
+    expected_output = "alpha delta"
+
+    assert_template_result(expected_output, template, { "array" => array, "some_property" => {} })
+  end
+
   def test_where_string_keys
     input = [
       "alpha", "beta", "gamma", "delta"