Added minimal repository structure for Snippets

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

- Adds connection between snippets in NestJS application to the models in the legacy Ghost codebase to link snippets to real data
- The NestJS controller code can be executed by commenting out `router.get('/snippets', mw.authAdminApi, http(api.snippets.browse));` in the ghost core Admin API routes file

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

@@ -0,0 +1,23 @@
+import {Inject} from '@nestjs/common';
+import {Snippet} from './Snippet';
+import {ISnippetsRepository} from './snippets.repository.interface';
+
+type QueryOptions = {
+    debug?: boolean;
+}
+
+type BookshelfModels = {
+    Snippet: {
+        findPage: (options: QueryOptions) => Promise<Snippet[]>;
+    }
+};
+
+export class SnippetRepositoryBookshelf implements ISnippetsRepository {
+    constructor(
+        @Inject('models') private readonly models: BookshelfModels
+    ) {}
+
+    async findAll(options: QueryOptions): Promise<Snippet[]> {
+        return this.models.Snippet.findPage(options);
+    }
+}

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

@@ -0,0 +1,15 @@
+import {Snippet} from './Snippet';
+import {ISnippetsRepository} from './snippets.repository.interface';
+
+export class SnippetsRepositoryInMemory implements ISnippetsRepository {
+    snippets: Snippet[];
+
+    constructor(
+    ) {
+        this.snippets = [];
+    }
+
+    async findAll(): Promise<Snippet[]> {
+        return this.snippets;
+    }
+}

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

@@ -0,0 +1,5 @@
+import {Snippet} from './Snippet';
+
+export interface ISnippetsRepository {
+  findAll(options: {debug?: boolean}): Promise<Snippet[]>;
+}

ghost/ghost/src/core/snippets/snippets.service.ts

@@ -0,0 +1,15 @@
+import {Injectable, Inject} from '@nestjs/common';
+import {Snippet} from './Snippet';
+import {ISnippetsRepository} from './snippets.repository.interface';
+
+@Injectable()
+export class SnippetsService {
+    constructor(
+        @Inject('SnippetsRepository') private readonly repository: ISnippetsRepository
+    ) {}
+
+    async browse(): Promise<Snippet[]> {
+        console.log('getting snippets from NEST!');
+        return this.repository.findAll({});
+    }
+}

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

@@ -1,6 +1,7 @@
 import {Test} from '@nestjs/testing';
 import {SnippetsController} from './snippets.controller';
-import {SnippetsService} from './snippets.service';
+import {SnippetsService} from '../../core/snippets/snippets.service';
+import {SnippetsRepositoryInMemory} from '../../core/snippets/snippets.repository.inmemory';
 import assert from 'assert/strict';
 import sinon from 'sinon';
 
@@ -11,7 +12,13 @@ describe('SnippetsController', () => {
     beforeEach(async () => {
         const moduleRef = await Test.createTestingModule({
             controllers: [SnippetsController],
-            providers: [SnippetsService]
+            providers: [
+                {
+                    provide: 'SnippetsRepository',
+                    useClass: SnippetsRepositoryInMemory
+                },
+                SnippetsService
+            ]
         }).compile();
 
         snippetsService = moduleRef.get<SnippetsService>(SnippetsService);

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

@@ -1,5 +1,5 @@
 import {Controller, Get} from '@nestjs/common';
-import {SnippetsService} from './snippets.service';
+import {SnippetsService} from '../../core/snippets/snippets.service';
 
 @Controller('snippets')
 export class SnippetsController {

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

@@ -1,12 +0,0 @@
-import {Injectable} from '@nestjs/common';
-import {Snippet} from '../../core/snippets/Snippet';
-
-@Injectable()
-export class SnippetsService {
-    // @NOTE: inject repository here using models
-    // constructor(@Inject('models') private readonly models) {}
-
-    browse(): Snippet[] {
-        return [];
-    }
-}

ghost/ghost/src/nestjs/AppModule.ts

@@ -1,9 +1,17 @@
 import {SnippetsController} from '../http/controllers/snippets.controller';
+import {SnippetRepositoryBookshelf} from '../core/snippets/snippets.repository.bookshelf';
+import {SnippetsService} from '../core/snippets/snippets.service';
 
 class AppModuleClass {}
 
 export const AppModule = {
     module: AppModuleClass,
     controllers: [SnippetsController],
-    providers: []
+    providers: [
+        {
+            provide: 'SnippetsRepository',
+            useClass: SnippetRepositoryBookshelf
+        },
+        SnippetsService
+    ]
 };