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module Shoulda
module Matchers
module ActiveModel
# Finds message information from exceptions thrown by #valid?
class ExceptionMessageFinder
def initialize(instance, attribute)
@instance = instance
@attribute = attribute
end
def allow_description(allowed_values)
"doesn't raise when #{@attribute} is set to #{allowed_values}"
end
def messages_description
if has_messages?
messages.join
else
'no exception'
end
end
def has_messages?
messages.any?
end
def messages
@messages ||= validate_and_rescue
end
def source_description
'exception'
end
def expected_message_from(attribute_message)
"#{human_attribute_name} #{attribute_message}"
end
private
def validate_and_rescue
@instance.valid?
[]
rescue ::ActiveModel::StrictValidationFailed => exception
[exception.message]
end
def human_attribute_name
@instance.class.human_attribute_name(@attribute)
end
end
end
end
end
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