Add mutation to add keywords (#24)

src/datasources/keyword-api.ts

@@ -68,6 +68,31 @@ ORDER BY keywords.value
 
     return this.knex('product_keyword').insert(fieldsToInsert);
   }
+
+  // Mutations
+  async addKeyword(name: string, type: KeywordType): Promise<number> {
+    const res = await this.knex('keywords')
+      .insert({ value: name })
+      .returning('id');
+    const keywordId = res[0];
+
+    if (type) {
+      const typeRes = await this.knex
+        .select('*')
+        .from('keywordtypes')
+        .where('name', type.toString().toLowerCase());
+
+      if (typeRes.length > 0) {
+        const typeId = typeRes[0].id;
+        await this.knex('keyword_type').insert({
+          keyword_id: keywordId,
+          type_id: typeId,
+        });
+      }
+    }
+
+    return keywordId;
+  }
 }
 
 /*