Created
April 16, 2021 21:36
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Ruby module (rspec) to count and assert number of mongo queries
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# Examples: | |
# | |
# expect { code }.to change { finds("users") }.by(3) | |
# expect { code }.to change { updates("contents") }.by(1) | |
# expect { code }.not_to change { inserts } | |
# | |
# MongoSpy.flush | |
# ..code.. | |
# expect(MongoSpy.queries).to match( | |
# "find" => { "users" => 1, "contents" => 1 }, | |
# "update" => { "users" => 1 } | |
# ) | |
# | |
# Reset numbers in a test or before(:each) (optional): | |
# | |
# MongoSpy.flush | |
# | |
# View all numbers during a test: | |
# | |
# pp MongoSpy.queries | |
# | |
module MongoSpy | |
module Helpers | |
%w(find delete insert update).each do |op| | |
define_method(op.pluralize) { |ns = nil| | |
ns ? MongoSpy.queries[op][ns] : MongoSpy.queries[op].values.sum | |
} | |
end | |
end | |
class << self | |
def queries | |
@queries ||= Hash.new { |h, k| h[k] = Hash.new(0) } | |
end | |
def flush | |
@queries = nil | |
end | |
def started(event) | |
op = event.command.keys.first # find, update, delete, createIndexes, etc. | |
ns = event.command[op] # collection name | |
return unless ns.is_a?(String) | |
queries[op][ns] += 1 | |
end | |
def succeeded(_); end | |
def failed(_); end | |
end | |
end | |
Mongo::Monitoring::Global.subscribe(Mongo::Monitoring::COMMAND, MongoSpy) | |
RSpec.configure do |config| | |
config.include MongoSpy::Helpers | |
end |
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