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class TrendCounter < ApplicationRecord
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belongs_to :trend
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validates :count, :numericality => {:greater_than_or_equal_to => 0}
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validates :created_at, :uniqueness => {:scope => :trend_id}
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default_scope -> { order(:created_at) }
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scope :recent, ->(*args) { where("created_at > ?", (args.first || 30.days.ago)).order(:created_at) }
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end
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