Merge pull request #26 from eneko/patch-1

Add Query Parameters page to Routing section

couscous.yml

@@ -78,8 +78,11 @@ menu:
                     text: Basic
                     relativeUrl: routing/basic.html
                 routing-parameters:
-                    text: Parameters
+                    text: Route Parameters
                     relativeUrl: routing/parameters.html
+                routing-query-parameters:
+                    text: Query Parameters
+                    relativeUrl: routing/query-parameters.html
                 routing-group:
                     text: Group
                     relativeUrl: routing/group.html

routing/query-parameters.md

@@ -0,0 +1,34 @@
+---
+currentMenu: routing-query-parameters
+---
+
+# Query Parameters
+
+Request query parameters can be accessed either as a dictionary or using the `extract` syntax which throws instead of returning an optional.
+
+## Optional Syntax
+
+Optional syntax is the easiest way to handle optional query parameters.
+
+```swift
+drop.get("comments") { request in
+	if let rating = request.query?["rating"]?.int {
+  	return "You requested comments with rating greater than #\(rating)"
+  }
+  return "You requested all comments"
+}
+```
+
+## Extract Syntax
+
+Extract syntax might be useful to *enforce* the presence of query parameters and throw an exception if they are not present. 
+To use this syntax first we need to ensure the query object is present with a `guard`.
+
+```swift
+drop.get("comments") { request in
+        guard let rating = request.query?["rating"]?.int else {
+            throw Abort.custom(status: .preconditionFailed, message: "Please include a rating")
+        }
+  return "You requested comments with rating greater than #\(rating)"
+}
+```