persistent_params

Save params in session to use them again when the user goes to another page and comes back. This gem adds a method to Rails controllers called persists_params that adds this feature to that controller.

I have to deal with not-so-simple search forms in my index templates. It's awful when I combine several filters, search for records, choose one of them to see details and then go back to the index page just to see all my filters gone and I have to set them all over.

With this gem, the controller will save the params in session and, when the same action is invoked again with no params, the request is redirected to the same path, but with the previous used params set.

It also offers a handy method to integrate with the HasScope gem, so scopes are persisted between requests.

In your Gemfile:

gem 'persistent_params'

In your controller:

class UsersController < ApplicationController
  persists_params
end

That's it. All the parameters except controller and action will be stored and used between requests to the index action. If you want to apply to other actions, use the only key when calling persists_params.

In my case, I use the gem to save scopes defined by HasScope. Not all parameters are scopes, so I created a handy method that configures PersistentParams to save only scopes:

class UsersController < ApplicationController
  has_scope :search

  persists_scopes # Add this AFTER declaring your scopes.
end

To actually clear the previous params and prevent the redirecting, you need to parameterize a ?clear=true. I usually do this with a link_to in my index:

<%= link_to 'Clear Filters', users_path(clear: true) %>

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Copyright (c) 2015 Diego Aguir Selzlein. See LICENSE.txt for further details.