Very useful helper if you want to keep your environment clean, useful for testing or if you have to require something that has lots of side effects or memory leaks.
Usage
result = fork_and_return do require 'some_lib_with_side_effects' leak_some_memory get_stuff_done end puts result
Code
# https://grosser.it/2012/07/15/return-values-from-fork-fork_and_return/ def fork_and_return(&block) require 'parallel' Parallel.map([0], &block).first end
If you like test::unit or are simply stuck with it, this works great on ruby 1.8 and 1.9+, have fun 🙂
gem install testrbl testrbl test/unit/xxx.rb:15 # test or should or context on line 15 testrbl test/unit.xxx.rb # all tests in xxx.rb testrbl test/unit # all tests in folder
Just posting it here since I did not find anything on google when searching this for our rails 2 upgrade 🙂
view_context.instance_variable_get(:@_virtual_path)
Kill those warnings without having to load activesupport, just drop this wherever you need 🙂
Usage
class Foo; BAR = 1; end
silence_warnings{ Foo.const_set :BAR, 2 }
Code
def silence_warnings
old_verbose, $VERBOSE = $VERBOSE, nil
yield
ensure
$VERBOSE = old_verbose
end
Tried a few strategies, but this seems to be the fastest:
DatabaseCleaner truncate_all: 0.8s
This: 0.2s
# fast truncation of all tables that need truncations (select is 10x faster then truncate)
# https://grosser.it/2012/07/03/rubyactiverecord-fastest-way-to-truncate-test-database/
def truncate_all_tables
config = ActiveRecord::Base.configurations[::Rails.env]
connection = ActiveRecord::Base.connection
connection.disable_referential_integrity do
connection.tables.each do |table_name|
next if connection.select_value("SELECT count(*) FROM #{table_name}") == 0
case config["adapter"]
when "mysql", "mysql2", "postgresql"
connection.execute("TRUNCATE #{table_name}")
when "sqlite", "sqlite3"
connection.execute("DELETE FROM #{table_name}")
connection.execute("DELETE FROM sqlite_sequence where name='#{table_name}'")
end
end
connection.execute("VACUUM") if config["adapter"] == "sqlite3"
end
end
Michael Grosser, the Blog 