In one of my recent project, I need to implement an autocomplete in active_admin interface to select one or more users from the user list. I tried googling on this and zeroed in on the library Chosen.Chosen by default supports multiple select, selected state.Chosen is available as a gem for Ruby on Rails which fits well with Asset Pipeline.
Include Chosen gem in your Gemfile.

1	gem ‘chosen-rails’

Once the gem is installed, include chosen javascript assets to your js file.

1	//= require chosen-jquery

In /app/admin/modelname.rb

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ActiveAdmin.register Modlename do #Customize creates and edit form form do |f| f.inputs do f.input :name f.input :othermodel, :input_html => { :class => "chosen-input" } # other model with has_many relation ship end f.buttons end end

in active_admin.js

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$(document).ready(function(){ $(".chosen-input").chosen(); });

if you are using coffee script instead of js then use this

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$ -> # enable chosen js $('.chosen-input').chosen allow_single_deselect: true no_results_text: 'No results matched'

Then, include Chosen stylesheet assets to your css file.

1	*= require chosen

To include more details check Here
Thats it, you will have a nice autocomplte with multiselect . Happy coding…