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class UnifyPermissions < ActiveRecord::Migration[4.2]
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def up
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names = Permission.group(:name).having("count(*) > 1").pluck(:name)
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names.each do |name|
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dup_permissions = Permission.where(:name => name).order(:id).pluck(:id).to_a
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# Keeps one of the duplicates
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saved_permission = dup_permissions.pop
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Filtering.where(:permission_id => dup_permissions).update_all(:permission_id => saved_permission)
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Permission.where(:id => dup_permissions).delete_all
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end
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add_index :permissions, :name, :unique => true
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end
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def down
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remove_index :permissions, :name, :unique => true
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end
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end
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