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Contents
module ActiveModelExtensions
module Validations
def self.included(base)
base.extend ClassMethods
end
# Validates the presence of the required fields identified in a rule-string.
#
# Similar to validates_presence_of macro, but is an INSTANCE method.
# This allows it to vary depending on custom settings.
#
# Example:
# validate_required_fields "field1,field2 or field4"
#
# The string is a CSV of required field rules, where each field rule is:
# - the name of a required field
# - OR a set of required field names spearated by 'or' (where only ONE is required)
#
class CustomPresenceValidator < ActiveModel::Validator
def validate(record)
required_fields = Array.wrap(@options[:attributes]).first.call || []
return if required_fields.empty?
required_fields.flatten.each do |required_field|
if required_field.include? ' or '
fields = required_field.split(' or ')
if fields.all? { |field| record.send(field).to_s.blank? }
record.errors.add(:base, "One of %s is required" % fields.map(&:humanize).to_sentence)
end
else
if record.send(required_field).to_s.blank?
record.errors.add(required_field, "is required")
end
end
end
end
end
module ClassMethods
def validate_presence_by_custom_rules(*with)
validates_with CustomPresenceValidator, _merge_attributes(with)
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems