如何从自定义错误消息+ rails 2

Question

  

如何在错误消息中从模型中删除字段名称   `module RankStudentModel

    def self.included (base)
        base.instance_eval do
            validates_uniqueness_of :first_name, :scope => [:batch_id, :phone2, :middle_name, :last_name], :message => "Student with same Name and Mobile number is already Present in the Batch " 
        end
    end

  

在上面的模型验证中，我需要跳过first_name错误消息，只需要显示给定的自定义消息。