Add keyword mutation for product (#19)

src/datasources/keyword-api.ts

@@ -55,18 +55,28 @@ ORDER BY keywords.value
       .then((row) => this.getType(row));
   }
 
-  /**
-   * category keywords
-   *
+  async setProductKeywords(
+    productId: number,
+    keywordIds: Array<number>,
+  ): Promise<any> {
+    await this.knex('product_keyword').where('product_id', productId).del();
+
+    const fieldsToInsert = keywordIds.map((keywordId) => ({
+      product_id: productId,
+      keyword_id: keywordId,
+    }));
+
+    return this.knex('product_keyword').insert(fieldsToInsert);
+  }
+}
+
+/*
+category keywords:
 SELECT category_keyword.category_id, keywords.value
 FROM category_keyword
 JOIN keywords ON category_keyword.keyword_id = keywords.id;
 
-
+texts:
   FROM  categorydata cd
   JOIN  categorydatakeys cdk ON cd.datakey_id = cdk.id
-
-
-*
-   */
-}
+*/