cars = Car.find(data).find_all{ |car| car.model == "Honda" }
this returns a list of Car's--I'd like to convert this list to a list that only contains the car.id's. How would I do it in a Ruby like way?
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3 Answers
Simply call:
cars = Car.find(data).find_all{ |car| car.model == "Honda" }.map{ |car| car.id }
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You can do this:
car_ids = Car.find(data).find_all{ |car| car.model=="Honda" }.map{ |car| car.id }
Essentially, array.map { |x| f(x) } returns a new array of identical size, which contains the result of calling f on each of the original array's entries, in the same order.
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I'd do it like that:
cars = Car.where(id: data, model: 'Honda').pluck(:id)
assuming that data is an array of car id's
