Counting the number of queries performed

Question

I\'d like to test that a certain piece of code performs as few SQL queries as possible.

ActiveRecord::TestCase seems to have its own assert_querie

Answer 1

I ended up creating a tiny gem to abstract this problem: sql_spy.

Just add it to your Gemfile:

gem "sql_spy"

Wrap your code inside SqlSpy.track { ... }:

queries = SqlSpy.track do
  # Some code that triggers ActiveRecord queries
  users = User.all
  posts = BlogPost.all
end

...and use the return value of the block in your assertions:

expect(queries.size).to eq(2)
expect(queries[0].sql).to eq("SELECT * FROM users;")
expect(queries[0].model_name).to eq("User")
expect(queries[0].select?).to be_true
expect(queries[0].duration).to eq(1.5)