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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_relation_explain
message = Car.where(:name => 'honda').explain
assert_match(/^EXPLAIN for:/, message)
end
def test_collecting_queries_for_explain
queries = ActiveRecord::Base.collecting_queries_for_explain do
Car.where(:name => 'honda').to_a
end
sql, binds = queries[0]
assert_match "SELECT", sql
if binds.any?
assert_equal 1, binds.length
assert_equal "honda", binds.flatten.last
else
assert_match 'honda', sql
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_unsupported_connection_adapter
connection.stubs(:supports_explain?).returns(false)
base.logger.expects(:warn).never
Car.where(:name => 'honda').to_a
end
end
end
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