Fixed count query in snippets bookshelf repository

refs https://github.com/TryGhost/Arch/issues/99

- Added naive version of the count method using bookshelf models metadata. We aim to use knex anyway, so this is just to get the tests passing

ghost/ghost/src/core/snippets/snippets.repository.bookshelf.ts

@@ -1,11 +1,11 @@
 import {Inject} from '@nestjs/common';
 import {Snippet} from './snippet.entity';
 import {SnippetsRepository} from './snippets.repository.interface';
-import {Pagination} from '../../common/pagination.type';
 import ObjectID from 'bson-objectid';
 
 type QueryOptions = {
     debug?: boolean;
+    filter?: string;
 }
 
 type BookshelfModels = {
@@ -38,7 +38,11 @@ export class SnippetRepositoryBookshelf implements SnippetsRepository {
     }
 
     async getCount(filter?: string | undefined): Promise<number> {
-        return 0;
+        const result = await this.models.Snippet.findPage({
+            filter: filter
+        });
+
+        return result.meta.pagination.total;
     }
 
     async getAll(): Promise<Snippet[]> {

ghost/ghost/src/http/controllers/snippets.controller.ts

@@ -69,7 +69,7 @@ export class SnippetsController {
             total = result.count;
             snippets = result.data;
         }
-        const pages = limit === 'all' ? 1 : Math.ceil(total / limit);
+        const pages = limit === 'all' ? 0 : Math.ceil(total / limit);
 
         const snippetDTOs = snippets.map(snippet => new SnippetDTO(snippet, {formats}));