Custom Parameter Binding

Custom parameter binding can be created easily by using @bind.custom decorator. You can create a new decorator by wrap the @bind.custom decorator inside a function.

Example below we will create parameter binder for ip address (instead of using @bind.request("ip"))

import {bind} from "plumier"

export function ip(){
    return bind.custom(ctx => ctx.request.ip)
}

The main logic of parameter binding is in inside the function callback, where the logic of which part of the context will be bound to the parameter. The call back function signature is like below:

process: (context:Koa.Context) => any

To use the ip decorator above is like below:

export class AnimalController {
    @route.get()
    save(@ip() ipAddress:string){

    }
}