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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_with_logger
base.logger.expects(:warn).with do |message|
message.starts_with?('EXPLAIN for:')
end
with_threshold(0) do
Car.where(:name => 'honda').to_a
end
end
def test_logging_query_plan_without_logger
original = base.logger
base.logger = nil
class << base.logger
def warn; raise "Should not be called" end
end
with_threshold(0) do
car = Car.where(:name => 'honda').first
assert_equal 'honda', car.name
end
ensure
base.logger = original
end
def test_collect_queries_for_explain
base.auto_explain_threshold_in_seconds = nil
queries = Thread.current[:available_queries_for_explain] = []
with_threshold(0) do
Car.where(:name => 'honda').to_a
end
sql, binds = queries[0]
assert_match "SELECT", sql
assert_match "honda", sql
assert_equal [], binds
ensure
Thread.current[:available_queries_for_explain] = nil
end
def test_collecting_queries_for_explain
result, queries = ActiveRecord::Base.collecting_queries_for_explain do
Car.where(:name => 'honda').to_a
end
sql, binds = queries[0]
assert_match "SELECT", sql
assert_match "honda", sql
assert_equal [], binds
assert_equal [cars(:honda)], result
end
def test_logging_query_plan_when_counting_by_sql
base.logger.expects(:warn).with do |message|
message.starts_with?('EXPLAIN for:')
end
with_threshold(0) do
Car.count_by_sql "SELECT COUNT(*) FROM cars WHERE name = 'honda'"
end
end
def test_exec_explain_with_no_binds
sqls = %w(foo bar)
binds = [[], []]
queries = sqls.zip(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(queries)
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]]]
queries = sqls.zip(binds)
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(queries)
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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