Add a page listing all valid category slugs

To direct people to when they have specified an invalid slug.

JSON containing all the slugs is available at
/api/v1/category_slugs, but visiting that in a browser doesn't work.

app/adapters/category-slug.js

@@ -0,0 +1,11 @@
+import ApplicationAdapter from './application';
+import Ember from 'ember';
+
+export default ApplicationAdapter.extend({
+    pathForType(modelName) {
+        var decamelized = Ember.String.underscore(
+          Ember.String.decamelize(modelName)
+        );
+        return Ember.String.pluralize(decamelized);
+    }
+});

app/models/category-slug.js

@@ -0,0 +1,5 @@
+import DS from 'ember-data';
+
+export default DS.Model.extend({
+    slug: DS.attr('string'),
+});

app/router.js

@@ -39,6 +39,7 @@ Router.map(function() {
     this.route('category', { path: '/categories/:category_id' }, function() {
         this.route('index', { path: '/' });
     });
+    this.route('category_slugs');
     this.route('catchAll', { path: '*path' });
 });
 

app/routes/category-slugs.js

@@ -0,0 +1,12 @@
+import Ember from 'ember';
+
+export default Ember.Route.extend({
+    queryParams: {
+        page: { refreshModel: true },
+        sort: { refreshModel: true },
+    },
+
+    model(params) {
+        return this.store.query('category-slug', params);
+    },
+});

app/templates/category_slugs.hbs

@@ -0,0 +1,14 @@
+{{ title 'Category Slugs' }}
+
+<div id='crates-heading'>
+    <img class='logo crate' src="/assets/crate.png"/>
+    <h1>All Valid Category Slugs</h1>
+</div>
+
+<div class='white-rows'>
+    <ul>
+      {{#each model as |slug|}}
+          <li>{{slug.slug}}</li>
+      {{/each}}
+    </ul>
+</div>

src/category.rs

@@ -233,3 +233,23 @@ pub fn show(req: &mut Request) -> CargoResult<Response> {
     struct R { category: EncodableCategoryWithSubcategories}
     Ok(req.json(&R { category: cat_with_subcats }))
 }
+
+/// Handles the `GET /category_slugs` route.
+pub fn slugs(req: &mut Request) -> CargoResult<Response> {
+    let conn = try!(req.tx());
+    let stmt = try!(conn.prepare("SELECT slug FROM categories \
+                                  ORDER BY slug"));
+    let rows = try!(stmt.query(&[]));
+
+    #[derive(RustcEncodable)]
+    struct Slug { id: String, slug: String }
+
+    let slugs: Vec<Slug> = rows.iter().map(|r| {
+        let slug: String = r.get("slug");
+        Slug { id: slug.clone(), slug: slug }
+    }).collect();
+
+    #[derive(RustcEncodable)]
+    struct R { category_slugs: Vec<Slug> }
+    Ok(req.json(&R { category_slugs: slugs }))
+}

src/lib.rs

@@ -105,6 +105,7 @@ pub fn middleware(app: Arc<App>) -> MiddlewareBuilder {
     api_router.get("/keywords/:keyword_id", C(keyword::show));
     api_router.get("/categories", C(category::index));
     api_router.get("/categories/:category_id", C(category::show));
+    api_router.get("/category_slugs", C(category::slugs));
     api_router.get("/users/:user_id", C(user::show));
     let api_router = Arc::new(R404(api_router));