A demo app using Ransack with Rails 5.1 and Ruby 2.3 to create advanced search forms.
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Ransack Demo Application

This is a quick demonstration of how you might use Ransack in a Rails 5 application to create an "advanced" search form, with nesting, etc.

The main things you'll want to note are:

  • app/models/user.rb - Demonstration of:
    • using a "ransacker" (a virtual, searchable "column") to allow searching on full names from concatenated first and last names.
    • whitelisting attributes allowed for searching using ransackable_attributes.
    • whitelisting attributes allowed for sorting using ransortable_attributes.
  • app/views/users/ - Search form and various partials used in dynamic form.
  • app/helpers/application_helper.rb - setup_search_form, which creates a Javascript search object with a grouping template, since we can't dynamically create grouping templates in Ruby (groupings can contain other groupings, would end up in infinite recursion). The rest of the methods in here are pretty much the same as the nested field helpers in Ryan Bates' Railscast #197.
  • app/assets/javascripts/search.js.coffee - CoffeeScript to handle addition/removal of fields, as well as nesting fields (adding a grouping from the previously mentioned grouping template)

Let us know if you have any questions, and happy ransacking!