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require 'cases/helper'
require 'models/car'
require 'active_support/core_ext/string/strip'
if ActiveRecord::Base.connection.supports_explain?
class ExplainTest < ActiveRecord::TestCase
fixtures :cars
def base
ActiveRecord::Base
end
def connection
base.connection
end
def test_logging_query_plan
base.logger.expects(:warn).with do |value|
value.starts_with?('EXPLAIN for:')
end
with_threshold(0) do
Car.where(:name => 'honda').all
end
end
def test_collecting_sqls_for_explain
base.auto_explain_threshold_in_seconds = nil
honda = cars(:honda)
expected_sqls = []
expected_binds = []
callback = lambda do |*args|
payload = args.last
unless base.ignore_explain_notification?(payload)
expected_sqls << payload[:sql]
expected_binds << payload[:binds]
end
end
result = sqls = binds = nil
ActiveSupport::Notifications.subscribed(callback, "sql.active_record") do
with_threshold(0) do
result, sqls, binds = base.collecting_sqls_for_explain {
Car.where(:name => 'honda').all
}
end
end
assert_equal result, [honda]
assert_equal expected_sqls, sqls
assert_equal expected_binds, binds
end
def test_exec_explain_with_no_binds
sqls = %w(foo bar)
binds = [[], []]
connection.stubs(:explain).returns('query plan foo', 'query plan bar')
expected = sqls.map {|sql| "EXPLAIN for: #{sql}\nquery plan #{sql}"}.join("\n")
assert_equal expected, base.exec_explain(sqls, binds)
end
def test_exec_explain_with_binds
cols = [Object.new, Object.new]
cols[0].expects(:name).returns('wadus')
cols[1].expects(:name).returns('chaflan')
sqls = %w(foo bar)
binds = [[[cols[0], 1]], [[cols[1], 2]]]
connection.stubs(:explain).returns("query plan foo\n", "query plan bar\n")
expected = <<-SQL.strip_heredoc
EXPLAIN for: #{sqls[0]} [["wadus", 1]]
query plan foo
EXPLAIN for: #{sqls[1]} [["chaflan", 2]]
query plan bar
SQL
assert_equal expected, base.exec_explain(sqls, binds)
end
def test_silence_auto_explain
base.expects(:collecting_sqls_for_explain).never
base.logger.expects(:warn).never
base.silence_auto_explain do
with_threshold(0) { Car.all }
end
end
def with_threshold(threshold)
current_threshold = base.auto_explain_threshold_in_seconds
base.auto_explain_threshold_in_seconds = threshold
yield
ensure
base.auto_explain_threshold_in_seconds = current_threshold
end
end
end
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