88 lines
2.2 KiB
Ruby
88 lines
2.2 KiB
Ruby
require 'cases/helper'
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require 'models/car'
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require 'active_support/core_ext/string/strip'
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if ActiveRecord::Base.connection.supports_explain?
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class ExplainTest < ActiveRecord::TestCase
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fixtures :cars
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def base
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ActiveRecord::Base
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end
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def connection
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base.connection
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end
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def test_relation_explain
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message = Car.where(:name => 'honda').explain
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assert_match(/^EXPLAIN for:/, message)
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end
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def test_collecting_queries_for_explain
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queries = ActiveRecord::Base.collecting_queries_for_explain do
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Car.where(:name => 'honda').to_a
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end
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sql, binds = queries[0]
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assert_match "SELECT", sql
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if binds.any?
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assert_equal 1, binds.length
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assert_equal "honda", binds.last.value
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else
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assert_match 'honda', sql
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end
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end
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def test_exec_explain_with_no_binds
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sqls = %w(foo bar)
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binds = [[], []]
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queries = sqls.zip(binds)
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stub_explain_for_query_plans do
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expected = sqls.map {|sql| "EXPLAIN for: #{sql}\nquery plan #{sql}"}.join("\n")
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assert_equal expected, base.exec_explain(queries)
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end
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end
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def test_exec_explain_with_binds
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object = Struct.new(:name)
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cols = [object.new('wadus'), object.new('chaflan')]
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sqls = %w(foo bar)
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binds = [[[cols[0], 1]], [[cols[1], 2]]]
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queries = sqls.zip(binds)
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stub_explain_for_query_plans(["query plan foo\n", "query plan bar\n"]) do
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expected = <<-SQL.strip_heredoc
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EXPLAIN for: #{sqls[0]} [["wadus", 1]]
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query plan foo
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EXPLAIN for: #{sqls[1]} [["chaflan", 2]]
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query plan bar
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SQL
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assert_equal expected, base.exec_explain(queries)
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end
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end
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def test_unsupported_connection_adapter
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connection.stub(:supports_explain?, false) do
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assert_not_called(base.logger, :warn) do
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Car.where(:name => 'honda').to_a
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end
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end
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end
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private
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def stub_explain_for_query_plans(query_plans = ['query plan foo', 'query plan bar'])
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explain_called = 0
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connection.stub(:explain, proc{ explain_called += 1; query_plans[explain_called - 1] }) do
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yield
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end
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end
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end
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end
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