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class CallForParticipation < ActiveRecord::Base
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belongs_to :conference
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def open?
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self.opens_at.present? and self.opens_at < Time.now
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end
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def closed?
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self.closes_at.present? and self.closes_at < Time.now
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end
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def in_progress?
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open? and not closed?
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end
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end
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