Aleksander Madland Stapnes madstap

Quiz: Lesson 3

1 What's the difference between rendering and redirecting? What's the impact with regards to instance variables, view templates?

Rendering displays the view to be rendered on the same action, instance variables set up will be available in this view. Redirecting makes a new http request and will hit another controller action forgetting any instance variables.

2 If I need to display a message on the view template, and I'm redirecting, what's the easiest way to accomplish this?

To use the flash.

	# Quiz: Lesson 1

	# Quiz from lesson one materials. You can do this yourself, or create a new gist
	# or blog entry, answer the quiz, and post the link to the forums and others can
	# take a look.

	# 1. Why do they call it a relational database?

	# Because it stores data and the relations between the data.

	# Quiz: Lesson 2

	# Some exercises from lesson 2 materials:

	# 1.Name all the 7 (or 8) routes exposed by the resources keyword in the
	# routes.rb file. Also name the 4 named routes, and how the request is routed to
	# the controller/action.

	# /app/config/routes.rb
	resources :posts

	java.lang.Exception: Unexpected EOF. [at line 16, column 1]
	at mranderson046.rewrite_clj.v0v4v13_20150917v134033_1.rewrite_clj.reader$throw_reader.doInvoke (reader.clj:18)
	clojure.lang.RestFn.invoke (RestFn.java:425)
	mranderson046.rewrite_clj.v0v4v13_20150917v134033_1.rewrite_clj.parser.core$eval19602$fn__19603.invoke (core.clj:78)
	clojure.lang.MultiFn.invoke (MultiFn.java:229)
	mranderson046.rewrite_clj.v0v4v13_20150917v134033_1.rewrite_clj.reader$read_with_meta.invoke (reader.clj:122)
	mranderson046.rewrite_clj.v0v4v13_20150917v134033_1.rewrite_clj.parser.core$parse_next.invoke (core.clj:34)
	mranderson046.rewrite_clj.v0v4v13_20150917v134033_1.rewrite_clj.parser.core$parse_delim$fn__19584.invoke (core.clj:42)
	mranderson046.rewrite_clj.v0v4v13_20150917v134033_1.rewrite_clj.reader$read_repeatedly$fn__19483.invoke (reader.clj:131)
	clojure.core$repeatedly$fn__5111.invoke (core.clj:4921)

	;; The code starts as a string in a text file, like any programming language.
	"(defn f [x]
	(* x x))"

	;; Then it's read by the reader.
	(with-in-str
	"(defn f [x]
	(* x x))" (read))

	;; Read returns this data structure:

	(ns things.defn-spec
	(:require [clojure.spec :as s]
	[clojure.test :as test :refer [deftest testing is are]]
	[clojure.spec.test :as stest]))


	'([name doc-string? attr-map? [params*] prepost-map? body]
	[name doc-string? attr-map? ([params*] prepost-map? body) + attr-map?]) ; What's this last map for?

	(defn non-&-sym? [x] (and (symbol? x) (not= '& x)))

	;; Eval this in scratch (or emacs setup)
	(setq cider-cljs-lein-repl
	"(do (require 'figwheel-sidecar.repl-api)
	(figwheel-sidecar.repl-api/start-figwheel!)
	(figwheel-sidecar.repl-api/cljs-repl))")

	;; Then m-x cider-jack-in-clojurescript


	(ns conform-let
	(:require
	[clojure.spec :as s]
	[clojure.core.specs :as core-specs]))

	(s/def ::conform-bindings
	(s/and vector?
	(s/spec (s/* (s/cat :binding ::core-specs/binding-form
	:spec some?

	(ns foo.core
	(:require
	[net.cgrand.enlive-html :as e]))

	(def x "<p>asd</p><a href=\"google.com\">google</a>")

	;; Parse
	(def y (e/html-snippet x))

	y ;=> ({:tag :p, :attrs nil, :content ("asd")} {:tag :a, :attrs {:href "google.com"}, :content ("google")})

	;; I can use & as a name with def
	(def & identity)

	& ;=> #object[Function "function (a){return a}"]

	;; But if I do
	(& 42)

	;; It throws the exception.