method
size

v4.2.7 -
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Class: ActiveRecord::Associations::HasManyThroughAssociation
size()
public
Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn’t been loaded, and by calling collection.size if it has. If the collection will likely have a size greater than zero, and if fetching the collection will be needed afterwards, one less SELECT query will be generated by using #length instead.