scinote-web/db/migrate/20151028091615_add_counter_cache_to_samples.rb

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class AddCounterCacheToSamples < ActiveRecord::Migration[4.2]
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def up
add_column :samples, :nr_of_modules_assigned_to, :integer, default: 0
add_column :my_modules, :nr_of_assigned_samples, :integer, default: 0
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# Okay, now initialize the values
if defined?(Sample)
Sample.find_each do |sample|
Sample.reset_counters(sample.id, :sample_my_modules)
end
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MyModule.find_each do |my_module|
MyModule.reset_counters(my_module.id, :sample_my_modules)
end
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end
end
def down
remove_column :samples, :nr_of_modules_assigned_to
remove_column :my_modules, :nr_of_assigned_samples
end
end