This is how make own custom rails validation with traslation

    errors.add(:base, I18n.t(:vola_summa_vigane)) if @amount <= 0.00

On Error display’s full_message => message only

    errors.add(:amount, I18n.t(:vola_summa_vigane)) if @amount <= 0.00 =>

On Error display’s “attribute - message”

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