adds validation for min-max length

app/models/custom_field.rb

@@ -74,6 +74,12 @@ class CustomField < ActiveRecord::Base
   validate :validate_default_value_in_translations
 
   validate :validate_name
+  
+  validates :min_length, numericality: { only_integer: true, :greater_than_or_equal => 0 }
+  validates :max_length, numericality: { only_integer: true, :greater_than_or_equal => 0 }
+  validates :min_length, numericality: { :less_than_or_equal_to => :max_length , :message => :greater_than_or_equal_to_max_length}, :unless => Proc.new { |cf| cf.max_length.blank?}
+
+
 
   def initialize(attributes = nil, options = {})
     super

config/locales/de.yml

@@ -196,6 +196,7 @@ de:
         exclusion: "ist nicht verfügbar"
         greater_than: "muss größer als %{count} sein"
         greater_than_or_equal_to: "muss größer oder gleich %{count} sein"
+        greater_than_or_equal_to_max_length: "muss größer oder gleich der maximalen Länge sein"
         greater_than_start_date: "muss größer als Anfangsdatum sein"
         inclusion: "ist kein gültiger Wert"
         invalid: "ist nicht gültig"

config/locales/en.yml

@@ -196,6 +196,7 @@ en:
         exclusion: "is reserved"
         greater_than: "must be greater than %{count}"
         greater_than_or_equal_to: "must be greater than or equal to %{count}"
+        greater_than_or_equal_to_max_length: "must be greater than or equal to maximum length"
         greater_than_start_date: "must be greater than start date"
         inclusion: "is not included in the list"
         invalid: "is invalid"