It's used in host_common.rb #22
https://github.com/isratrade/foreman/blob/inherit_loc/app/models/concerns/host_common.rb#L22
```ruby
    has_many :lookup_values, :finder_sql => Proc.new { LookupValue.where('lookup_values.match' => lookup_value_match).to_sql }, :dependent => :destroy
```

If it's in taxonomy.rb, then the matcher needs to determine the sti type. I think this is easier to understand.
```ruby
    "location=#{label}"
```