By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:
/people/6
But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.
jQuery has become the most popular JavaScript library both inside and outside the Rails community. Let's look at how to take advantage of the library with our applications.
The setup process differs depending on whether your app is running on a version of Rails before 3.1 or greater than 3.1.
| def sumInts(a: Int, b: Int): Int = | |
| if (a > b) 0 else a + sumInts(a + 1, b) | |
| def countChange(money: Int, couns: List[Int]): Int = { | |
| if (money == 0) 1 | |
| else if (money < 0) 0 | |
| else if (coins.isEmpty && money >= 1) 0 | |
| else { | |
| countChange(money, coins.tail) + countChange(money - coins.head, coins) | |
| } |