NQL

Natural Query Language built on top of ActiveRecord and Ransack

Installation

Add this line to your application's Gemfile:

gem 'nql'

And then execute:

$ bundle

Or install it yourself as:

$ gem install nql

Supported comparators

--------------------------------------
| Symbol | Description               |
--------------------------------------
| :      | Contains                  |
| !:     | Not contains              |
| =      | Equals                    |
| !=     | Not equals                |
| >      | Grater than               |
| >=     | Grater or equals than     |
| <      | Less than                 |
| <=     | Less or equals than       |
| ~      | Matches (eq ignore case)  |
--------------------------------------

Usage

Converts from natural language to query expression

Country.nql('(name: arg | name: br) & region = south').to_sql
=> "SELECT coutries.* FROM countries WHERE (countries.name LIKE '%arg%' OR countries.name LIKE '%br%') AND region = 'south'"

Joins support

Country.nql('cities.name: buenos').to_sql
=> "SELECT countries.* FROM countries LEFT OUTER JOIN cities ON countries.id = cities.country_id WHERE cities.name LIKE '%buenos%'"

Invalid expressions handling

Safe query

Country.nql('xyz').to_sql
=> "SELECT coutries.* FROM countries WHERE (1=2)

Raising exceptions

Country.nql!('xyz') => raise NQL::SyntaxError

Country.nql!('xyz: arg') => raise NQL::AttributesNotFoundError

Country.nql!(1234) => raise NQL::DataTypeError

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request