ActiveRecordQueryCount

ActiveRecordQueryCount is a Ruby gem designed to help you visualize and track the SQL queries executed by your ActiveRecord models within a block of code.

By subscribing to ActiveSupport notifications, it provides detailed insights into the number of queries being run, the time taken by the code at specific locations (by adding the time each query took in that place), the tables involved, and the locations in your code where the queries were generated.

This gem offers three key features:

1. View an overview of all queries executed by a block of code, including the time taken and their origin locations, presented in a graph, an HTML table, or directly in the console.
2. Benchmark two blocks of code to compare SQL query counts at different locations, with results displayed in a graph or table.
3. Get an overview of SQL queries for the current request in a controller action, accessible via a button in the top-left corner of the screen.

Installation

Add this line to your application's Gemfile:

gem 'active-record-query-count'

And then execute:

bundle install

Or install it yourself as:

gem install active-record-query-count

Usage

There are four ways of using this gem:

1. With a block of code

   require 'active-record-query-count'
   ActiveRecordQueryCount.start_with_block(printer: :html) do
       # your code goes here
   end
   

   this will open up a html table with the SQL stats of your code

2. Starting recording manually

   require 'active-record-query-count'
   
   ActiveRecordQueryCount.start_recording
   # your code goes here
   ActiveRecordQueryCount.end_recording(printer: :html)
   

3. Comparing two blocks of code (only available for html printer)

   require 'active-record-query-count'
   ActiveRecordQueryCount.compare do |bench|
       bench.code('script1') do
       end
       bench.code('script2') do
       end
       bench.compare!
   end
   

   this will open up a graph comparing the quantity of SQL of the two codes

4. Enabling a middleware to see an overview of the current request SQL's in Rack Application.

This will disponibilize a button on the top left on every request that will open the query count html view of the request on a modal.

To enable this, there are two ways,

1. You can enable it by an enviroment variable called ENABLE_QUERY_COUNT.

2. In config/development.rb or the initializer of the application.

   ```ruby
     config.after_initialize do
       ActiveRecordQueryCount.configure do |configuration|
         configuration.enable_middleware = true
       end
     end
   ```
   

Printing options

There are two ways of displaying the collected queries data, :console and :html, to select one pass the printer argument to start_with_block o end_recording methods.

If you use html with WSL enviroment, you need to set on your enviroments variables the WSL_DISTRIBUTION that you are using, so the dependency Launchy work as expected.

Configuration options

When visualizing the html table or the console output, tables with less than ignore_table_count will not be shown. Also, the amount of locations to show is given by max_locations_per_table

config.after_initialize do
    ActiveRecordQueryCount.configure do |configuration|
      # Default values
      configuration.ignore_table_count = 1
      configuration.max_locations_per_table = 4
      configuration.enable_middleware = false
    end
  end
end

Examples of visualization

1. Console output

1. HTML output

1. Bar chart output

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/jvlara/active-record-query-count. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the ActiveRecordQueryCount project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.