Ruby on Rails

I have a model, Work, that when I create a new instance with incorrect
field data does not call the validation methods. When I update an
existing instance with the same incorrect fields the validation
methods are called.

The create action fails on the save method and re-routes to the new
action, causing runtime errors.

I dont understand why update validates correctly and create doesn't.

Validation lines in the model are as follows:

validates :start, :presence => { :message => "must be a valid date/
time" }
validates :end, :presence => {:message => "must be a valid date/
time"}
validate :start_must_be_before_end_time

def start_must_be_before_end_time
errors.add(:start, "must be before end time") unless
self.start < self.end
end

Any pointers would be great.

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