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-rw-r--r--activemodel/lib/active_model/validations/length.rb12
1 files changed, 10 insertions, 2 deletions
diff --git a/activemodel/lib/active_model/validations/length.rb b/activemodel/lib/active_model/validations/length.rb
index 940c58f3a7..d6c80b2c5d 100644
--- a/activemodel/lib/active_model/validations/length.rb
+++ b/activemodel/lib/active_model/validations/length.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module ActiveModel
module Validations
class LengthValidator < EachValidator # :nodoc:
@@ -29,8 +31,8 @@ module ActiveModel
keys.each do |key|
value = options[key]
- unless (value.is_a?(Integer) && value >= 0) || value == Float::INFINITY
- raise ArgumentError, ":#{key} must be a nonnegative Integer or Infinity"
+ unless (value.is_a?(Integer) && value >= 0) || value == Float::INFINITY || value.is_a?(Symbol) || value.is_a?(Proc)
+ raise ArgumentError, ":#{key} must be a nonnegative Integer, Infinity, Symbol, or Proc"
end
end
end
@@ -43,6 +45,12 @@ module ActiveModel
next unless check_value = options[key]
if !value.nil? || skip_nil_check?(key)
+ case check_value
+ when Proc
+ check_value = check_value.call(record)
+ when Symbol
+ check_value = record.send(check_value)
+ end
next if value_length.send(validity_check, check_value)
end