Localized fields should be validated separately for each localization because the value should be unique in each locale.

For example, we have a document with localized attribute:

{ description:

{ "en" => "Car", "de" => "Auto" }

}

We want to add a new document:

{ description:

{ "en" => "Motorbike", "de" => "Auto" }

}

The description hash is different but we have the same value for "de" locale. To solve this issue I implemented uniqueness validation for licalized fields using $or selection:

validatable.or(

{ "description.en" => "Motorbike" }

,

{ "description.de" => "Auto" }

)

case_sensitive flag was also fixed.