module ActiveRecord::Assertions::QueryAssertions

assert_no_queries(include_schema: true) { Post.columns }

If the +:include_schema+ option is provided, any queries (including schema related) are counted.

assert_no_queries { post.comments }

Asserts that no SQL queries are executed in the given block.

def assert_no_queries(include_schema: false, &block)
  assert_queries_count(0, include_schema: include_schema, &block)
end