Ransack search string arrays stored in db

Question

I'm trying to search using ransack for articles.

In one of my question in how to get the articles based on their tags, I found out how to do so:

Find articles where array

Now I just want to do the search with ransack but I get an error

I have it like this

<%= search_form_for @q do |f| %>
        <div class="row">
          <div class="col-md-2">
            <%= f.label :tags_in %> <span data-toggle='tooltip', data-placement='right', title='Una o dos palabras máximo para expecificar lo que está buscando' class="glyphicon glyphicon-question-sign" ></span>
            <%= f.search_field :tags_in, class: 'form-control' %>
          </div>
          <div class="col-md-2">
            <%= f.submit 'Buscar', class: 'btn btn-primary m-t-large' %>
          </div>
        </div>

      <% end %>

the error I get when performing this searching for xbox is the following:

PG::InvalidTextRepresentation: ERROR:  array value must start with "{" or dimension information
LINE 1: ...es".* FROM "articles" WHERE "articles"."tags" IN ('xbox')  O...

heres the controller:

def index
    @q = Article.ransack(params[:q])
    @articles = @q.result.paginate(page: params[:page], :per_page => 10).order('created_at DESC')
  end

How can I search for the articles using their tags?

Thanks!

Answer 1

As discussed on this issue you need to add the gem postgres_ext to your project:

# Gemfile
gem 'postgres_ext'

And add this to an initializer:

# config/initializers/ransack.rb
Ransack.configure do |config|
  %w[
    contained_within
    contained_within_or_equals
    contains
    contains_or_equals
    overlap
  ].each do |p|
    config.add_predicate p, arel_predicate: p, wants_array: true
  end
end

After that you'll be able to use contains in a serialized array.