Rails model attribute allow nil but validate when not -


i want validate input box value in 2 cases:

  1. if nil? save successfully, no errors
  2. if not nil? validate format

i have simple line here:

validates :ip_addr, format: { with: regexp.union(resolv::ipv4::regex)}

this work in cases won't allow nil/empty value throws exception. but:

validates :ip_addr, format: { with: regexp.union(resolv::ipv4::regex)}, allow_nil: true

and 

validates :ip_addr, format: { with: regexp.union(resolv::ipv4::regex)}, allow_blank: true

will allow nil/empty values if input invalid e.g. "33@@@#$" returns "true".

how include both cases ? possible ?

edit: seems regexp.union(resolv::ipv4::regex).match("something") returns nil if validation works same way, return nil in wrong values , allow_nil: true allow them persisted this.

try this

validates :ip_addr, format: { with: regexp.union(resolv::ipv4::regex)}, if: :ip_addr

i not sure whether above 1 work. if doesn't, this

validate :ip_addr_format_check, if: :ip_addr  def ip_addr_format_check   unless ip_addr =~ regexp.union(resolv::ipv4::regex)     errors.add(:base, "error want show")   end end

-

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