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class RemoveDuplicateFactNames < ActiveRecord::Migration[4.2]
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def up
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unique_names = FactName.group(:name).maximum(:id)
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unique_names.each do |fact_name, fact_name_id|
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duplicates = FactName.where("name=? and id<>?", fact_name, fact_name_id).select(:id)
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if duplicates.any?
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ActiveRecord::Base.transaction do
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FactValue.update_all(
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["fact_name_id=?", fact_name_id],
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["fact_name_id in (?)", duplicates]
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)
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UserFact.update_all(
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["fact_name_id=?", fact_name_id],
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["fact_name_id in (?)", duplicates]
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)
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FactName.where(["id in (?)", duplicates]).delete_all
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end
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end
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end
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end
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def down
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end
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end
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