before delete/destroy check for restrict dependents [rails]

has_no_restrict_dependent.rb

# Rails

# to use globally, put in class ApplicationRecord
# before delete/destroy check for restrict dependents
# given an object, iterate its associations, and check if the restricted ones are empty or not.

def has_no_restrict_dependent?
  self.class.reflect_on_all_associations.all? do |assoc|
    ( ([:restrict_with_error, :restrict_with_exception].exclude? assoc.options[:dependent]) ||
        (assoc.macro == :has_one && self.send(assoc.name).nil?) ||
        (assoc.macro == :has_many && self.send(assoc.name).empty?) )
  end
end