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hey welcome to the channel in this video were going to look at four ways to build dependent drop-downs the kind where you need to fill in one before the second one gets populated and so on and one of them is going to blow you away i promise at my first rails job i worked for a company that was building a car repair app this was in 2008 and back then the only way to create a drop down for choosing a cars make model and year was to use javascript and heres why the problem with these kinds of drop downs is you cannot load everything from the database in memory because there is a lot of data just for this simple example there are more than 15 000 records you need to keep in memory and youre probably going to ignore a lot of it because you only care about one car not all of them then there is the size of the payload for every new request to this page youre going to have to download a huge html file so because you have to download such a big file its going to be slow as well and we wan