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# File 'activerecord/lib/active_record/validations/uniqueness.rb', line 20
def validate_each(record, attribute, value)
finder_class = find_finder_class_for(record)
value = map_enum_attribute(finder_class, attribute, value)
return if record.persisted? && !validation_needed?(finder_class, record, attribute)
relation = build_relation(finder_class, attribute, value)
if record.persisted?
if finder_class.primary_key
relation = relation.where.not(finder_class.primary_key => [record.id_in_database])
else
raise UnknownPrimaryKey.new(finder_class, "Cannot validate uniqueness for persisted record without primary key.")
end
end
relation = scope_relation(record, relation)
if options[:conditions]
conditions = options[:conditions]
relation = if conditions.arity.zero?
relation.instance_exec(&conditions)
else
relation.instance_exec(record, &conditions)
end
end
if relation.exists?
error_options = options.except(:case_sensitive, :scope, :conditions)
error_options[:value] = value
record.errors.add(attribute, :taken, **error_options)
end
end
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