Fix NoMethodError preparable for Arel::Visitors in case prepared statements is falsy

2 files changed, 23 insertions, 1 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 bb5119d64e..aa5ae15285 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -30,7 +30,7 @@ module ActiveRecord
       def select_all(arel, name = nil, binds = [], preparable: nil)
         arel, binds = binds_from_relation arel, binds
         sql = to_sql(arel, binds)
-        if arel.is_a?(String) && preparable.nil?
+        if !prepared_statements || (arel.is_a?(String) && preparable.nil?)
           preparable = false
         else
           preparable = visitor.preparable
diff --git a/activerecord/test/cases/adapters/postgresql/prepared_statements_test.rb b/activerecord/test/cases/adapters/postgresql/prepared_statements_test.rb
new file mode 100644
index 0000000000..f1519db48b
--- /dev/null
+++ b/activerecord/test/cases/adapters/postgresql/prepared_statements_test.rb
@@ -0,0 +1,22 @@
+require "cases/helper"
+require "models/developer"
+
+class PreparedStatementsTest < ActiveRecord::PostgreSQLTestCase
+  fixtures :developers
+
+  def setup
+    @default_prepared_statements = Developer.connection_config[:prepared_statements]
+    Developer.connection_config[:prepared_statements] = false
+  end
+
+  def teardown
+    Developer.connection_config[:prepared_statements] = @default_prepared_statements
+  end
+
+  def nothing_raised_with_falsy_prepared_statements
+    assert_nothing_raised do
+      Developer.where(id: 1)
+    end
+  end
+
+end