Backport #3232 to 3-1-stable.

Use the schema_search_path in prepared statements in postgres.

Only the tests are backported, the fix was already included by
commit 818d285305.

activerecord/CHANGELOG.md

@@ -1,5 +1,10 @@
 ## Rails 3.1.2 (unreleased) ##
 
+*   Fix problem with prepared statements and PostgreSQL when multiple schemas are used.
+    *GH #3232*
+
+    *Juan M. Cuello*
+
 *   Fix bug with PostgreSQLAdapter#indexes. When the search path has multiple schemas, spaces
     were not being stripped from the schema names after the first.
 

activerecord/test/cases/adapters/postgresql/schema_test.rb

@@ -37,6 +37,10 @@ class SchemaTest < ActiveRecord::TestCase
     set_table_name 'test_schema."Things"'
   end
 
+  class Thing5 < ActiveRecord::Base
+    set_table_name 'things'
+  end
+
   def setup
     @connection = ActiveRecord::Base.connection
     @connection.execute "CREATE SCHEMA #{SCHEMA_NAME} CREATE TABLE #{TABLE_NAME} (#{COLUMNS.join(',')})"
@@ -178,6 +182,21 @@ class SchemaTest < ActiveRecord::TestCase
     ActiveRecord::Base.connection.schema_search_path = "public"
   end
 
+  def test_prepared_statements_with_multiple_schemas
+
+    @connection.schema_search_path = SCHEMA_NAME
+    Thing5.create(:id => 1, :name => "thing inside #{SCHEMA_NAME}", :email => "thing1@localhost", :moment => Time.now)
+
+    @connection.schema_search_path = SCHEMA2_NAME
+    Thing5.create(:id => 1, :name => "thing inside #{SCHEMA2_NAME}", :email => "thing1@localhost", :moment => Time.now)
+
+    @connection.schema_search_path = SCHEMA_NAME
+    assert_equal 1, Thing5.count
+
+    @connection.schema_search_path = SCHEMA2_NAME
+    assert_equal 1, Thing5.count
+  end
+
   private
     def columns(table_name)
       @connection.send(:column_definitions, table_name).map do |name, type, default|