Make select_all on query cache accept a Relation without binds.

[fixes #14361]
[related #13886]

2 files changed, 10 insertions, 12 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index 6eb59cc398..dd1962e4d6 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -20,14 +20,7 @@ module ActiveRecord
 
       # Returns an ActiveRecord::Result instance.
       def select_all(arel, name = nil, binds = [])
-        if arel.is_a?(Relation)
-          relation = arel
-          arel = relation.arel
-          if !binds || binds.empty?
-            binds = relation.bind_values
-          end
-        end
-
+        arel, binds = binds_from_relation arel, binds
         select(to_sql(arel, binds), name, binds)
       end
 
@@ -47,10 +40,7 @@ module ActiveRecord
       # Returns an array of the values of the first column in a select:
       #   select_values("SELECT id FROM companies LIMIT 3") => [1,2,3]
       def select_values(arel, name = nil)
-        binds = []
-        if arel.is_a?(Relation)
-          arel, binds = arel.arel, arel.bind_values
-        end
+        arel, binds = binds_from_relation arel
         select_rows(to_sql(arel, binds), name, binds).map(&:first)
       end
 
@@ -389,6 +379,13 @@ module ActiveRecord
           row = result.rows.first
           row && row.first
         end
+
+        def binds_from_relation(relation, binds = [])
+          if relation.is_a?(Relation) && binds.blank?
+            relation, binds = relation.arel, relation.bind_values
+          end
+          [relation, binds]
+        end
     end
   end
 end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
index adc23a6674..4a4506c7f5 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
@@ -63,6 +63,7 @@ module ActiveRecord
 
       def select_all(arel, name = nil, binds = [])
         if @query_cache_enabled && !locked?(arel)
+          arel, binds = binds_from_relation arel, binds
           sql = to_sql(arel, binds)
           cache_sql(sql, binds) { super(sql, name, binds) }
         else