1 files changed, 4 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 8fca34e524..8d5ea271a7 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -2055,9 +2055,10 @@ module ActiveRecord #:nodoc:
         end
 
         def replace_named_bind_variables(statement, bind_vars) #:nodoc:
-          statement.gsub(/:([a-zA-Z]\w*)/) do
-            match = $1.to_sym
-            if bind_vars.include?(match)
+          statement.gsub(/(:?):([a-zA-Z]\w*)/) do
+            if $1 == ':' # skip postgresql casts
+              $& # return the whole match
+            elsif bind_vars.include?(match = $2.to_sym)
               quote_bound_value(bind_vars[match])
             else
               raise PreparedStatementInvalid, "missing value for :#{match} in #{statement}"