feat(api): add api for listing article's linked drafts

schema.graphql

@@ -187,6 +187,9 @@ type Article implements Node {
   oss: ArticleOSS!
   remark: String
 
+  """Drafts linked to this article."""
+  drafts: [Draft!]
+
   """The counting number of comments."""
   commentCount: Int!
 

src/connectors/draftService.ts

@@ -62,4 +62,18 @@ export class DraftService extends BaseService {
    */
   findByMediaHash = async (mediaHash: string) =>
     this.knex.select().from(this.table).where({ mediaHash }).first()
+
+  /**
+   * Find published drafts by given article id.
+   */
+  findByArticleId = async ({ articleId }: { articleId: string }) =>
+    this.knex
+      .select()
+      .from(this.table)
+      .where({
+        articleId,
+        archived: true,
+        publishState: PUBLISH_STATE.published,
+      })
+      .orderBy('created_at', 'desc')
 }

src/definitions/schema.d.ts

@@ -203,6 +203,11 @@ export interface GQLArticle extends GQLNode {
   oss: GQLArticleOSS
   remark?: string
 
+  /**
+   * Drafts linked to this article.
+   */
+  drafts?: Array<GQLDraft>
+
   /**
    * The counting number of comments.
    */
@@ -3424,6 +3429,7 @@ export interface GQLArticleTypeResolver<TParent = any> {
   transactionsReceivedBy?: ArticleToTransactionsReceivedByResolver<TParent>
   oss?: ArticleToOssResolver<TParent>
   remark?: ArticleToRemarkResolver<TParent>
+  drafts?: ArticleToDraftsResolver<TParent>
   commentCount?: ArticleToCommentCountResolver<TParent>
   pinCommentLimit?: ArticleToPinCommentLimitResolver<TParent>
   pinCommentLeft?: ArticleToPinCommentLeftResolver<TParent>
@@ -3782,6 +3788,15 @@ export interface ArticleToRemarkResolver<TParent = any, TResult = any> {
   ): TResult
 }
 
+export interface ArticleToDraftsResolver<TParent = any, TResult = any> {
+  (
+    parent: TParent,
+    args: {},
+    context: Context,
+    info: GraphQLResolveInfo
+  ): TResult
+}
+
 export interface ArticleToCommentCountResolver<TParent = any, TResult = any> {
   (
     parent: TParent,

src/queries/draft/article/drafts.ts

@@ -0,0 +1,16 @@
+import { connectionFromPromisedArray, cursorToIndex } from 'common/utils'
+import { ArticleToDraftsResolver } from 'definitions'
+
+const resolver: ArticleToDraftsResolver = async (
+  { articleId, authorId },
+  _,
+  { viewer, dataSources: { draftService } }
+) => {
+  const isAuthor = authorId === viewer.id
+  if (!isAuthor) {
+    return []
+  }
+  return draftService.findByArticleId({ articleId })
+}
+
+export default resolver

src/queries/draft/index.ts

@@ -3,12 +3,16 @@ import slugify from '@matters/slugify'
 import { countWords, makeSummary, toGlobalId } from 'common/utils'
 
 import article from './article'
+import articleDrafts from './article/drafts'
 import assets from './assets'
 import collection from './collection'
 import draftCover from './cover'
 import drafts from './drafts'
 
 export default {
+  Article: {
+    drafts: articleDrafts,
+  },
   User: {
     drafts,
   },

src/types/article.ts

@@ -163,6 +163,9 @@ export default /* GraphQL */ `
     # OSS
     oss: ArticleOSS! @auth(mode: "${AUTH_MODE.admin}")
     remark: String @auth(mode: "${AUTH_MODE.admin}")
+
+    "Drafts linked to this article."
+    drafts: [Draft!]
   }
 
   "This type contains content, count and related data of an article tag."