88 lines
2.2 KiB
Ruby
88 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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require "cases/helper"
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require "models/car"
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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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sqls = %w(foo bar)
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binds = [[bind_param("wadus", 1)], [bind_param("chaflan", 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
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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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def bind_param(name, value)
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ActiveRecord::Relation::QueryAttribute.new(name, value, ActiveRecord::Type::Value.new)
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end
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end
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end
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