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# frozen_string_literal: true
require "cases/helper"
require "models/car"
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.last.value
else
assert_match "honda", sql
end
end
def test_exec_explain_with_no_binds
sqls = %w(foo bar)
binds = [[], []]
queries = sqls.zip(binds)
stub_explain_for_query_plans do
expected = sqls.map { |sql| "EXPLAIN for: #{sql}\nquery plan #{sql}" }.join("\n")
assert_equal expected, base.exec_explain(queries)
end
end
def test_exec_explain_with_binds
sqls = %w(foo bar)
binds = [[bind_param("wadus", 1)], [bind_param("chaflan", 2)]]
queries = sqls.zip(binds)
stub_explain_for_query_plans(["query plan foo\n", "query plan bar\n"]) do
expected = <<~SQL
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
end
def test_unsupported_connection_adapter
connection.stub(:supports_explain?, false) do
assert_not_called(base.logger, :warn) do
Car.where(name: "honda").to_a
end
end
end
private
def stub_explain_for_query_plans(query_plans = ["query plan foo", "query plan bar"])
explain_called = 0
connection.stub(:explain, proc { explain_called += 1; query_plans[explain_called - 1] }) do
yield
end
end
def bind_param(name, value)
ActiveRecord::Relation::QueryAttribute.new(name, value, ActiveRecord::Type::Value.new)
end
end
end
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