Merge pull request rails#22748 from Azzurrio/master

Fix NoMethodError preparable for Arel::Visitors::PostgreSQL

Author: matthewd

activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb

@@ -30,7 +30,7 @@ def cacheable_query(arel) # :nodoc:
       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

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