how can I search by ip address? about search_cop HOT 8 OPEN

irb(main):021:0> HostSearch.search(ip: '192')
NameError: uninitialized constant SearchCopGrammar::Attributes::Inet
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop_grammar/attributes.rb:89:in `const_get'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop_grammar/attributes.rb:89:in `attribute_for'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop_grammar/attributes.rb:55:in `block in attributes'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop_grammar/attributes.rb:55:in `collect'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop_grammar/attributes.rb:55:in `attributes'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop_grammar/attributes.rb:38:in `matches'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop/hash_parser.rb:38:in `parse_attribute'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop/hash_parser.rb:21:in `block in parse'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop/hash_parser.rb:10:in `each'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop/hash_parser.rb:10:in `collect'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop/hash_parser.rb:10:in `parse'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop.rb:23:in `parse'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop/query_builder.rb:10:in `initialize'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop.rb:61:in `new'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop.rb:61:in `unsafe_search_cop'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop.rb:53:in `search_cop'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/search_cop-1.0.6/lib/search_cop.rb:44:in `block in search_scope'
  from (irb):21
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/console.rb:110:in `start'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/console.rb:9:in `start'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:68:in `console'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
  from /Users/user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
  from bin/rails:4:in `require'

class HostSearch < ::Host
  include SearchCop

  search_scope :search do
    attributes :ip, :name
  end
end

  create_table "hosts", force: :cascade do |t|
    t.inet     "ip",                                         null: false
    t.string   "name",                  limit: 255
  end