thoughtbot--shoulda-matchers/lib/shoulda/matchers/active_model/validate_absence_of_matcher.rb

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2013-12-05 16:38:30 +00:00
module Shoulda # :nodoc:
module Matchers
module ActiveModel # :nodoc:
# Ensures that the model is not valid if the given attribute is present.
#
# Options:
# * <tt>with_message</tt> - value the test expects to find in
# <tt>errors.on(:attribute)</tt>. <tt>Regexp</tt> or <tt>String</tt>.
# Defaults to the translation for <tt>:present</tt>.
#
# Examples:
# it { should validate_absence_of(:name) }
# it { should validate_absence_of(:name).
# with_message(/may not be set/) }
def validate_absence_of(attr)
ValidateAbsenceOfMatcher.new(attr)
end
class ValidateAbsenceOfMatcher < ValidationMatcher # :nodoc:
def with_message(message)
@expected_message = message
self
end
def matches?(subject)
super(subject)
@expected_message ||= :present
disallows_value_of(value, @expected_message)
end
def description
"require #{@attribute} to not be set"
end
private
def value
if reflection
obj = reflection.klass.new
if collection?
[ obj ]
else
obj
end
elsif attribute_class == Fixnum
1
elsif !attribute_class || attribute_class == String
'an arbitrary value'
else
attribute_class.new
end
end
def attribute_class
@subject.class.respond_to?(:columns_hash) &&
@subject.class.columns_hash[@attribute].respond_to?(:klass) &&
@subject.class.columns_hash[@attribute].klass
end
def collection?
if reflection
[:has_many, :has_and_belongs_to_many].include?(reflection.macro)
else
false
end
end
def reflection
@subject.class.respond_to?(:reflect_on_association) &&
@subject.class.reflect_on_association(@attribute)
end
end
end
end
end