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Diffstat (limited to 'activemodel/lib/active_model/validations/numericality.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/numericality.rb | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations/numericality.rb b/activemodel/lib/active_model/validations/numericality.rb new file mode 100644 index 0000000000..4c4e0ce952 --- /dev/null +++ b/activemodel/lib/active_model/validations/numericality.rb @@ -0,0 +1,80 @@ +module ActiveModel + module Validations + module ClassMethods + ALL_NUMERICALITY_CHECKS = { :greater_than => '>', :greater_than_or_equal_to => '>=', + :equal_to => '==', :less_than => '<', :less_than_or_equal_to => '<=', + :odd => 'odd?', :even => 'even?' }.freeze + + + # Validates whether the value of the specified attribute is numeric by trying to convert it to + # a float with Kernel.Float (if <tt>integer</tt> is false) or applying it to the regular expression + # <tt>/\A[\+\-]?\d+\Z/</tt> (if <tt>integer</tt> is set to true). + # + # class Person < ActiveRecord::Base + # validates_numericality_of :value, :on => :create + # end + # + # Configuration options: + # * <tt>message</tt> - A custom error message (default is: "is not a number") + # * <tt>on</tt> Specifies when this validation is active (default is :save, other options :create, :update) + # * <tt>only_integer</tt> Specifies whether the value has to be an integer, e.g. an integral value (default is false) + # * <tt>allow_nil</tt> Skip validation if attribute is nil (default is false). Notice that for fixnum and float columns empty strings are converted to nil + # * <tt>greater_than</tt> Specifies the value must be greater than the supplied value + # * <tt>greater_than_or_equal_to</tt> Specifies the value must be greater than or equal the supplied value + # * <tt>equal_to</tt> Specifies the value must be equal to the supplied value + # * <tt>less_than</tt> Specifies the value must be less than the supplied value + # * <tt>less_than_or_equal_to</tt> Specifies the value must be less than or equal the supplied value + # * <tt>odd</tt> Specifies the value must be an odd number + # * <tt>even</tt> Specifies the value must be an even number + # * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should + # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The + # method, proc or string should return or evaluate to a true or false value. + # * <tt>unless</tt> - Specifies a method, proc or string to call to determine if the validation should + # not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The + # method, proc or string should return or evaluate to a true or false value. + def validates_numericality_of(*attr_names) + configuration = { :on => :save, :only_integer => false, :allow_nil => false } + configuration.update(attr_names.extract_options!) + + + numericality_options = ALL_NUMERICALITY_CHECKS.keys & configuration.keys + + (numericality_options - [ :odd, :even ]).each do |option| + raise ArgumentError, ":#{option} must be a number" unless configuration[option].is_a?(Numeric) + end + + validates_each(attr_names,configuration) do |record, attr_name, value| + raw_value = record.send("#{attr_name}_before_type_cast") || value + + next if configuration[:allow_nil] and raw_value.nil? + + if configuration[:only_integer] + unless raw_value.to_s =~ /\A[+-]?\d+\Z/ + record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number]) + next + end + raw_value = raw_value.to_i + else + begin + raw_value = Kernel.Float(raw_value.to_s) + rescue ArgumentError, TypeError + record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number]) + next + end + end + + numericality_options.each do |option| + case option + when :odd, :even + record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[option]) unless raw_value.to_i.method(ALL_NUMERICALITY_CHECKS[option])[] + else + message = configuration[:message] || ActiveRecord::Errors.default_error_messages[option] + message = message % configuration[option] if configuration[option] + record.errors.add(attr_name, message) unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]] + end + end + end + end + end + end +end
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