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class Trend < ActiveRecord::Base
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after_save :create_values, :if => lambda{ |o| o.fact_value == nil }
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after_destroy :destroy_values, :if => lambda{ |o| o.fact_value == nil }
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belongs_to :trendable, :polymorphic => true
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has_many :trend_counters, :dependent => :destroy
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scope :has_value, lambda { where('fact_value IS NOT NULL').order("fact_value") }
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scope :types, lambda { where(:fact_value => nil) }
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def to_param
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"#{id}-#{to_label.parameterize}"
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end
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private
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def destroy_values ids = []
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TrendCounter.where(:trend_id => ids).delete_all
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Trend.where(:id => ids).delete_all
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end
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end
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