Matching array values in PostgreSQL with ActiveRecord

In my Rails 4 app I have a goal to see all contacts, where field visible_to in contacts table equal to 1. My visible_to is :integer, array: true.

However, I get the following exception:

PG::UndefinedFunction: ERROR:  operator does not exist: integer[] = integer
LINE 1: ....* FROM "contacts"  WHERE "contacts"."visible_to" IN (1)  OR...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.:
SELECT "contacts".* FROM "contacts"  WHERE "contacts"."visible_to" IN (1)  ORDER BY created_at DESC

I searched for answers and as far as I see there is an issue with a type of visible_to. However, I couldn't find the solution. I also tried to get benefit from casts hint, but in vain.

My migration:

class AddVisibleToToContacts < ActiveRecord::Migration
    def change
      add_column :contacts, :visible_to, :integer, array: true, default: [], using: 'gin'     
    end 
end

Relevant variable from Controller:

@contacts_all_user_sorted = Contact.all.where(visible_to: [1]).order("created_at DESC")