ruby on rails - RoR: Error handle to validates_uniqueness_of example -

ruby on rails - RoR: Error handle to validates_uniqueness_of example -

my ror app reads in csv file , imports lot of data. 1 model's attribute validated unique (set validates_uniqueness_of) , info attribute can not repeated. however, how can allow repeated info pass, rather show error page? i'd file reading process go on running while ignoring repeated data.

ruby-on-rails