Inspiriert von dieser Antwort
haben wir die folgende database.rake erstellt Datei. Wo die ursprüngliche Antwort nur für PostgreSQL 9.1 funktionierte, wurde diese so geändert, dass sie auch für PostgreSQL 9.2 funktioniert. Der Mechanismus ist nicht der schönste:Wenn der 9.1-Befehl fehlschlägt, führt er einfach den 9.2-Befehl aus. Aber das Wichtigste:Es funktioniert!
#{Rails.root}/lib/tasks/databases.rake
# monkey patch ActiveRecord to avoid There are n other session(s) using the database.
def drop_database(config)
case config['adapter']
when /mysql/
ActiveRecord::Base.establish_connection(config)
ActiveRecord::Base.connection.drop_database config['database']
when /sqlite/
require 'pathname'
path = Pathname.new(config['database'])
file = path.absolute? ? path.to_s : File.join(Rails.root, path)
FileUtils.rm(file)
when /postgresql/
begin
ActiveRecord::Base.establish_connection(config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
ActiveRecord::Base.connection.select_all("select * from pg_stat_activity order by procpid;").each do |x|
if config['database'] == x['datname'] && x['current_query'] =~ /<IDLE>/
ActiveRecord::Base.connection.execute("select pg_terminate_backend(#{x['procpid']})")
end
end
ActiveRecord::Base.connection.drop_database config['database']
rescue # in PG 9.2 column procpid was renamed pid and the query status is checked not using 'current_query' but using 'state'
ActiveRecord::Base.establish_connection(config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
ActiveRecord::Base.connection.select_all("select * from pg_stat_activity order by pid;").each do |x|
if config['database'] == x['datname'] && x['state'] =~ /idle/
ActiveRecord::Base.connection.execute("select pg_terminate_backend(#{x['pid']})")
end
end
ActiveRecord::Base.connection.drop_database config['database']
end
end
end
