apply quoting patch

lib/active_record/connection_adapters/postgis/quoting.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module ActiveRecord
+  module ConnectionAdapters
+    module PostGIS
+      module Quoting
+        def type_cast(value)
+          case value
+          when RGeo::Feature::Instance
+            value.to_s
+          else
+            super
+          end
+        end
+      end
+    end
+  end
+end

lib/active_record/connection_adapters/postgis_adapter.rb

@@ -16,6 +16,7 @@
 require_relative "postgis/arel_tosql"
 require_relative "postgis/oid/spatial"
 require_relative "postgis/oid/date_time"
+require_relative "postgis/quoting"
 require_relative "postgis/type" # has to be after oid/*
 # :startdoc:
 
@@ -42,6 +43,7 @@ class PostGISAdapter < PostgreSQLAdapter
       # http://postgis.17.x6.nabble.com/Default-SRID-td5001115.html
       DEFAULT_SRID = 0
 
+      include PostGIS::Quoting
       include PostGIS::SchemaStatements
       include PostGIS::DatabaseStatements
 

test/cases/spatial_queries_test.rb

@@ -115,11 +115,19 @@ def test_ewkt_parser_query
       assert_nil(obj3)
     end
 
+    def test_geo_safe_where
+      create_model
+      SpatialModel.create!(latlon_geo: geographic_factory.point(-72.1, 42.1))
+      SpatialModel.create!(latlon_geo: geographic_factory.point(10.0, 10.0))
+      assert_equal 1, SpatialModel.where("ST_DWITHIN(latlon_geo, ?, 500)", geographic_factory.point(-72.099, 42.099)).count
+    end
+
     private
 
     def create_model
       SpatialModel.lease_connection.create_table(:spatial_models, force: true) do |t|
         t.column "latlon", :st_point, srid: 3785
+        t.column "latlon_geo", :st_point, srid: 4326, geographic: true
         t.column "points", :multi_point, srid: 3785
         t.column "path", :line_string, srid: 3785
       end