Fix rake db:structure:dump on Postgres when multiple schemas are used

activerecord/CHANGELOG.md

@@ -1,3 +1,12 @@
+*   Fix `rake db:structure:dump` on Postgres when multiple schemas are used.
+
+    If postgresql is being used and there are multiple schemas listed on the
+    `schema_search_path`, then `structure.sql` dumps (triggered by `rake
+    db:structure:dump` or `config.active_record.schema_format = :sql`) began
+    failing in Rails 4.2.5.
+
+    *Nick Muerdter*
+
 *   Except keys of `build_record`'s argument from `create_scope` in `initialize_attributes`.
 
     Fixes #21893.

activerecord/lib/active_record/tasks/postgresql_database_tasks.rb

@@ -56,9 +56,9 @@ def structure_dump(filename)
 
         args = ['-s', '-x', '-O', '-f', filename]
         unless search_path.blank?
-          args << search_path.split(',').map do |part|
+          args += search_path.split(',').map do |part|
             "--schema=#{part.strip}"
-          end.join(' ')
+          end
         end
         args << configuration['database']
         run_cmd('pg_dump', args, 'dumping')

activerecord/test/cases/tasks/postgresql_rake_test.rb

@@ -212,7 +212,7 @@ def test_structure_dump
     def test_structure_dump_with_schema_search_path
       @configuration['schema_search_path'] = 'foo,bar'
 
-      Kernel.expects(:system).with('pg_dump', '-s', '-x', '-O', '-f', @filename, '--schema=foo --schema=bar', 'my-app-db').returns(true)
+      Kernel.expects(:system).with('pg_dump', '-s', '-x', '-O', '-f', @filename, '--schema=foo', '--schema=bar', 'my-app-db').returns(true)
 
       ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, @filename)
     end
@@ -228,7 +228,7 @@ def test_structure_dump_with_schema_search_path_and_dump_schemas_all
     end
 
     def test_structure_dump_with_dump_schemas_string
-      Kernel.expects(:system).with("pg_dump", '-s', '-x', '-O', '-f', @filename, '--schema=foo --schema=bar', "my-app-db").returns(true)
+      Kernel.expects(:system).with("pg_dump", '-s', '-x', '-O', '-f', @filename, '--schema=foo', '--schema=bar', "my-app-db").returns(true)
 
       with_dump_schemas('foo,bar') do
         ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, @filename)