test.rb

require 'active_record'
require 'logger'

ActiveRecord::Base.establish_connection(adapter: 'postgresql', database: 'avsej')

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.string :first_name
    t.string :last_name
    t.string :role
  end
end

class User < ActiveRecord::Base; end

puts "without squeel: #{User.where(role: 'admin').where_values.inspect}"
require 'squeel'
puts "with squeel: #{User.where(role: 'admin').where_values.inspect}"

# -- create_table(:users, {:force=>true})
#    -> 0.0240s
# without squeel: [#<Arel::Nodes::Equality:0x00000001f32450 @left=#<struct Arel::Attributes::Attribute relation=#<Arel::Table:0x00000001f2a868 @name="users", @engine=User(id: integer, first_name: string, last_name: string, role: string), @columns=nil, @aliases=[], @table_alias=nil, @primary_key=nil>, name="role">, @right="admin">]
# with squeel: [{:role=>"admin"}]
#=> nil
#  0.270000   0.030000   0.300000 (  0.336954)