PifyZ

Friendly URLs

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.

PifyZ

data Typ =
    IntTyp
  | BolTyp
  | FunTyp Typ Typ

toType : Typ -> Type
toType IntTyp       = Integer
toType BolTyp       = Bool
toType (FunTyp x y) = toType x -> toType y

PifyZ

-- Two dashes start a one-line comment.

--[[
     Adding two ['s and ]'s makes it a
     multi-line comment.
--]]

----------------------------------------------------
-- 1. Variables and flow control.
----------------------------------------------------

PifyZ

// The base constructor (can be left empty, but a nice boilerplate might look like this)
function Class(properties) {
  if (properties) {
    // Add properties to the instance
    Object.getOwnPropertyNames(properties).forEach(function (property_name) {
      var descriptor = Object.getOwnPropertyDescriptor(properties, property_name);
      Object.defineProperty(this, property_name, descriptor);
    }, this);
  }
}